A Revision of the Genus Eurytomocharis Ashmead in North America. (Hymenoptera: Eurytomidae.)

Abstract

The genus Eurytomocharis was described by Ashmead in 1888, without any included species. E. minuta, described by Ashmead in 1894, was designated the genotype. Peck in 1951 placed Eurytomo- charis as a synonym of Eurytoma, and then resurrected it again in 1963. The present revision redefines the genus and describes the following new species from North America: Eurytomocharis armillata, E. sporoboli, E. glyceriae, E. pascuorum, and E. planitiae. All of the species, where known, are phytophagous in the stems of grasses. Examination of cotype specimens in the U. S. National Museum collection from beyond the boundaries of continental North America have resulted in transferring Eurytomocharis minima Ashm. from St. Vincent, West Indies, to the genus Eurytoma and Isosoma heteromera Ashm., also from St. Vincent, to Eurytomocharis. The genus Eurytomocharis has had a varied history. It was listed by Ashmead in 1888 in a paper containing a key to the genera of the Eurytominae, without any included species. In 1894 Ashmead described Eurytomocharis minuta from Jacksonville, Florida, and designated it as the genotype. In 1896 L. 0. Howard described two additional species of the genus, E. eragrostidis, from stems of Eragrostis poaeoides from Lafayette, Indiana, and E. triodiae, from dry stems of Triodia cuprea collected near Washington, D. C. The genus has never been formally described except by a brief mention of characteristics used in keys in the papers by Ashmead, 1888 and 1904.