Abstract
1. Several behaviouristic and physiological differences distinguish the two species Trichogramma semblidis and T. evanescens (tabulated on p. 514).2. There are no true intermediates between the two forms of the male T. semblidis, but intermediate types are simulated by degenerate individuals of small size produced by starvation.3. Among 1740 males reared from eggs of Sialis and 1847 reared from eggs of moths, there were only nineteen exceptions to the rule that the apterous form emerges from the former and the winged form from the latter.4. The ability of T. semblidis to produce its apterous male can remain latent through as many as sixty-four generations reared on Sitotroga and yet find its full expression immediately when the parasite is reared on Sialis.5. Several other species of Neuroptera have been parasitized, but Sialis lutaria remains the only known host that regularly elicits the apterous form.6. T. semblidis is capable of arrhenotokous parthenogenesis. The statement that the species includes thelytokous strains requires corroboration.
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