Species Of Sawflies Research Articles

THE NEARACTIC SAWFLIES OF THE DINEURA COMPLEX (HYMEN.: TENTHREDINIDAE)

The nematine genus Dineura has had assigned to it at various times several species of nearctic sawflies. A close study of these species indicates that Dineura itself is not represented in our fauna, but instead three genera which resemble it in wing venation. This complex was considered by MacGillivray as the sub-family Dineurinae, but as pointed out by Rohwer it is in reality part of the Nematinae. The three genera involved may be separated from the other Nematinae by having the front wings with the base of vein 2A and 3A absent and the second radial cross-vein (2r) present. The extreme differences between the genera suggest strongly that the segregate is purely an artificial one based only on accidental similarity in venation.

The Larval Wax Glands of the Dogwood Sawfly (Macremphytus Varianus Norton).*

Waxy secretions have been observed on the larvae of various species of sawflies (Tenthredinidae) especially in the subfamilies Diprioninae, Emphytinae, Selandriinae, Tenthredininae and Nematinae. In some cases the secretion was scanty, being evident as a waxy bloom on the surface of the cuticula. In others it was considerable, forming flocculent masses which concealed the entire body of the larva. Packard (1898)[†][1] described and figured the larva of a Selandria whose body was nearly concealed by long thread-like masses of wax. So far as could be ascertained no description of the wax glands of any species of sawfly has appeared in entomological literature. Consequently a discussion of the structure of these glands in the larva of Macremphytus varianus Norton will not be out of place at this time. [1]: #fn-2

GYNANDROMORPHS AND OTHER IRREGULAR TYPES IN HABROBRACON

Among the higher Hymenoptera it is now generally assumed that females arise from fertilized eggs, males from unfertilized. Exceptions to this have, however, been claimed in certain ants (Wheeler, W. M., 1903). Among the lower Hymenoptera conditions are much more irregular. Some species of saw-flies are exclusively or predominantly female-producing, thelytokous; others male-producing, arrenotokous; while others, amphitokous, produce both sexes parthenogenetically. Gall wasps with their alternation of sexual and parthenogenetic generations have in the latter both male-producing and femaleproducing females. Polyembryonic Chalcidoids produce male broods from unfertilized eggs, female broods from fertilized, but Patterson (Patterson, J. F., 1917) has shown that certain broods, predominantly female, may contain a few males, presumably derived from mitotic irregularities in the polygerm. Among the Ichneumonoids, to which group Habrobracon belongs, arrenotoky is the rule but some species are thelytokous. In a species that is predominantly arrenotokous it has been shown (Hunter, S. J., I9o9, and Webster, F. M., I909) that the tendency to produce females is probably inherited. The irregular forms discussed in the present paper have 89

Synopsis of the species of sawflies belonging to the genus Dimorhopteryx

Synopsis of the species of sawflies belonging to the genus Dimorhopteryx

A synopsis, and descriptions of the Nearctic species of sawflies of the genus Xyela, with descriptions of other new species of sawflies

A synopsis, and descriptions of the Nearctic species of sawflies of the genus Xyela, with descriptions of other new species of sawflies

The Habits of the Larvæ and Adults of Sirex and Thalessa

WE have received from Mr. E. P. Stebbing, of Dehra Dun, India, an account of the habits of the larva of a Himalayan species of sawfly (Sirex) and its parasite, an ichneumon allied to Thalessa, of which the following is an epitome. The adult sawfly deposits its eggs in the wood of dead spruce-trees (Picea morinda). When hatched, the grubs bore horizontally into the wood for a short distance and then drive a tunnel vertically upwards or downwards after the manner of the European S. augur. The débris, after passing through the body of the grub, is so closely jammed in the tunnel that no holes are visible in the wood when sawn through. The pupa is formed at the end of the tunnel, where it lies naked at an angle to the axis of the stem at a variable distance from the exterior. In place of following the old, tortuous track of the grub—for several reasons a matter of difficulty—the adult insect cuts its way to the exterior by the nearest route, which unlike that of the European species, is not, as a rule, at right angles to the larval tunnel. The mature insect never seems to have the slightest hesitation in determining the direct route to the outer world. It may be added that the larval state seems to last for several years, as grubs of different ages occur in the same trunk.

A new genus and species of sawfly

A new genus and species of sawfly

XI.—Descriptions of five new species of Australian sawflies

XI.—<i>Descriptions of five new species of Australian sawflies</i>

Our Book Shelf

OF the Bulletin de la Société Impériale des Naturalistes de Moscow, we have just received the first, second, and third parts for the year 1869. The greater part of the important papers in the second part are on Botanical subjects. They include a monographic revision, with tables of species, of the Heliotropes of the eastern Mediterranean region, in which seventy species are cited, and twenty-two of them described as new; a notice of the occurrence of the white Truffle (Rhizopogon albus) in the neighbourhood of Moscow; a note on Empusa muscœ and a revision of the species of Characium found in the vicinity of Charkow. Colonel Motschoulsky continues his seemingly interminable “enumeration” of the new species of Coleoptera collected by him during his travels, leading us to wonder how any one man could have collected so many beetles, and, having got them, how he can write so much about them. This, however, is but a small instalment. Another entomological paper of more consequence is a monograph of the genus Abacetus by Baron Chandoir; M. Solsky has a notice of some beetles from Eastern Russia, and M. E. Ballion another on two species of sawflies. The most interesting zoological paper is on the anatomy and development of Pedicellina (Sars), by M. B. Uljanin, illustrated with two plates. In this paper our countryman, Mr. Gosse, is absurdly quoted as “Goose.” The remaining papers are by Dr. Ferd. Müller on the determination of the magnetic inclination, and by M. R. Hermann on the composition of Fergusonite. The last part consists of a series of éloges on Alexander Von Humboldt, read at a centenary celebration of the great German philosopher. These papers, by different authors, treat of Humboldt from various points of views: as a man and as a naturalist; in his relations to Russia; as an investigator in the domain of electro-physiology; as a botanist; as an investigator of physical geography and climatology. As they are all in Russian we fear these memoirs will find few readers in this country. A German translation of the first of these will, however, be found in the first part of the Bulletin, which includes a variety of papers on Natural History subjects. An important geological paper is one by Prof. Trautschold, on secular elevations and sinkings of the earth's surface. Dr. D. Zernoff's memoir on the olfactory organs in the Cephalopoda, which is illustrated with two plates, is a valuable contribution to the anatomy of the Mollusca. In an important memoir, also accompanied by two plates, M. J. Borsenkow describes the developmental history of the ovary and egg in the common fowl. For the botanist we have a continuation of M. L. Gruner's catalogue of plants collected on the Dnieper and the lower part of the Kouka; and a notice, by M. Alexander Becker, of Sarepta, of a journey to Debent, which also, as usual, includes entomological notices. For the entomologist finally we have a catalogue of the Coleoptera of the vicinity of Jaroslaw, by M. von Bell; remarks upon some species as cited in Harold's great catalogue of Beetles, by M. E. Ballion; and, from the inexhaustible Motschulsky, a further instalment of descriptions of new species of Coleoptera.

VI. On the Œconomy of a new Species of Saw-fly.

Journal Article VI. On the Œconomy of a new Species of Saw-fly Get access John Curtis, Esq., F.L.S. John Curtis, Esq., F.L.S. Search for other works by this author on: Oxford Academic Google Scholar Transactions of the Linnean Society of London, Volume os-21, Issue 1, May 1852, Pages 39–42, https://doi.org/10.1111/j.1096-3642.1852.tb00498.x Published: 09 April 2009 Article history Accepted: 22 July 2008 Published: 09 April 2009