482 PROCEEDINGS OF THE NATIONAL. MUSEUM vol.83 



irregular transverse rows, each pit bearing a conspicuous appressed 

 silvery-white hair at its center; antennal scape cylindrical, pedicel 

 a little shorter than first funicle joint, ring joint as long as broad, 

 first to fifth funicle joints longer than broad, sixth and seventh 

 funicle joints quadrate, club about as long as two preceding funicle 

 joints and slightly broader than funicle; malar space equal to a 

 little less than half the eye height; ocellocular line a little longer 

 than the diameter of an ocellus. Mesoscutum, scutellum, and axillae 

 with fine and nearly uniform alveolate sculpture, the scutellum with 

 a delicate cross furrow; propodeum practically smooth and without 

 carinae; mesepimeron and metapleuron smooth and polished; hind 

 coxae outwardly strongly sculptured; stigmal vein sessile, postmar- 

 ginal nearly twice as long as stigmal and about one-sixth as long 

 as marginal; abdomen about as long as head and thorax, narrower 

 than thorax, very faintly sculptured, the first to fifth tergites 

 deeply emarginate apically. Head above and dorsum of thorax dull 

 brassy green ; face dull purplish ; occiput and temples a little brighter 

 metallic green than vertex; scape testaceous; flagellum brownish 

 black; pronotum bluish; pleura violaceous; mesosternum black; 

 propodeum shining green; posterior coxae strongly violaceous, the 

 anterior and median pairs less strongly so; all femora dark brown- 

 ish, with a slight metallic luster ; all tibiae and tarsi testaceous ; wings 

 hyaline except for the two brownish fasciae already described; ab- 

 domen above bright green basally, beyond the first tergite and be- 

 neath aeneous black; ovipositor sheaths black. 



Male. — Length 2.45 mm. Similar to the female except that the 

 abdomen is about as long as the thorax, the scape is rather strongly 

 tinged with metallic, and the pleura not so strongly violaceous. 



Type locality. — Mexico City, JSIexico. 



Type.—U.S.^M. no. 51447. 



Described from five females and one male, said to have been reared 

 in April 1928 by L. H. Hitchcock from Phytophaga sp. infesting 

 Opuntia. 



Family EURYTOMIDAE 



Genus RILEYA Ashmead 



BILEYA OPUNTIAE, new species 



In the key to species of the genus Rileya published by me in 1918,^ 

 this species runs directly to couplet 14 and of the two species occur- 

 ring in that category agrees best with similai^ Gahan. It differs 

 from dtnilaris by having the parapsidal grooves effaced, the stria- 

 tions of face stronger and extended upward somewhat beyond the 

 lower margin of the antennal depression, the antennal flagellum dis- 



1 Proc. Ent. Soc. Washington, vel. 20, p. 137. 1918. 



