1925 ] A New Genus of Chalcidoid Hymenoptera 37 
vein about half as long as submarginal; postmarginal about or 
almost as long as marginal; stigmal moderate, clavate, with an 
upper lateral pointed projection; abdomen broad, with five ter- 
gites visible before the pointed hairy apex; fourth nearly as long 
as first three together, second much shorter than first or third ; 
sculpture minutely cancellate or reticulate, produciug a dullish 
surface, but first segment highly polished; hind margins of sec- 
ond and third segments shining; no rows of strong punctures; 
no trace of a dorsal carina; venter convex, polished, with deep 
median groove for ovipostor, which is only very slightly exsert- 
ed at apex. 
Megormyrus amabilis n. sp. 
Female. Length about 7 mm.; head in front obscure dull 
green, cheeks shining green; scape chestnut red, flagellum black, 
suffused with red about middle; thorax dorsally dull obscure 
greenish, but pronotum somewhat shining posteriorly, post- 
scutellum brilliant purple, metathorax green with rosy patches, 
sides more brassy; hind coxae shining green, with a brassy luster; 
legs (except the green coxae) bright chestnut red; first abdominal 
segment highly polished, shining beautiful coppery red, second 
and third obscurely green, fourth very dark blue, fifth dark blue; 
venter shining. Stigmal vein 255 microns long; postmarginal 
about 800, from its end to, wing tip about 640. Compared with 
Ormyrodes Brues, it differs by not being coarsely punctured, nor 
the abdomen excessively elongate; also by the lack of a dorsal 
keel on abdomen and shorter marginal vein. From Monohceus 
Forster it differs by the sculpture of the abdomen, hairy eyes, 
and general appearance. In Ashmead’s table it appears to fall 
closest to Monobceus, but it is certainly not congeneric with M. 
hegeli Girault, described from Michigan. I have not access to 
the descriptions of Forster’s two species, but as Mayr referred 
them to Ormyrus, they are evidently quite different from the 
insect now described. In the Colorado fauna, this actually 
seems closest to the remarkable Ormyrodes petref actus Brues, 
fossil in the Miocene of Florissant. May we suppose that for- 
merly this group of insects was more abundant, surviving today 
