TWO GENERA OF CHA-LCID'-FLIES — GAHAiM 351 



on middle of mesoscutiim, the declivous portion nearly smooth ; pro- 

 podeum faintly reticulated, shining, with a delicate median carina and 

 with the extreme lateral margin covered with silvery-white hairs. An- 

 terior femur distinctly but not greatly thickened ; basitarsus of middle 

 leg only slightly thickened, the calcarium about three-fourths as long 

 as basitarsus and moderately stout ; posterior femur broad, not more 

 slender beyond than before the middle ; posterior tibia strongly com- 

 pressed, a little narrower than the femur and tapering from near 

 middle toward base; two calcaria very distinct. Forewing with the 

 costal cell mostly ciliated; area behind submarginal vein with some 

 rather coarse cilia marking the obsolete basal and median veins and 

 a few similar hairs irregularly placed within the median cell; beyond 

 point where submarginal vein begins to curve toward wing margin 

 nearly uniformly ciliated ; marginal vein a little more than twice as 

 long as stigmal, postmarginal approximately three-fourths length of 

 marginal. Abdomen about as long as thorax but much narrower ; first 

 tergite smooth, the following tergites weakly reticulated. 



Type locaUty, — Brownsville, Tex. 



r?/^6.— U.S.N.M. No. 56650. 



Reinarhs. — Described from 1 female (holotype) and 19 males reared 

 by T. C. Barber, in May 1933, as secondary parasites of Estigmene 

 acraea Drur}^, the actual host in this case probably having been 

 Apanteles sp. 



7. ARACHNOPHAGA OPACA, new species 



Similar in most respects to picea but distinguishable at once by the 

 more strongly and more uniformly sculptured mesoscutum. 



Female. — Length 3 mm. General color dull black; pronotum later- 

 ally and head behind the eyes usually tinted with metallic green ; pro- 

 podeum smooth with strong metallic reflections ; pleura, legs, and base 

 of abdomen brownish black; scape yellowish testaceous, flagellum 

 brownish black ; forewing hyaline at base, fuscous behind the marginal 

 vein, and subhyaline apically; hind wing hyaline; ovipositor sheaths 

 yellowish. 



Head viewed from in front about as broad as high; cheek nearly 

 straight; malar space equal to about two-thirds the length of eye; 

 eyes sparsely pilose, converging above, the frons equal in width 

 to about two-fifths the width of head ; scrobal depression broad, shal- 

 low, and poorly delimited ; frontal ledge forming a sharp carina from 

 lower extremity of eye to antennal fossa; ocelli in an obtuse trian- 

 gle; ocellocular line equal to very slightly more than the diameter 

 of an ocellus; head in dorsal view thin anteroposteriorly ; occiput 

 concave; angle formed by occiput and vertex rounded, not sharp; 

 whole head with unusually strong and nearly uniform sculpture and 



