12 bulletin: museum of comparative zoology. 



Callibaetis nigrita, sp. nov. 



Tijpe.— M. C. Z. 10,059. Colo.: Boulder, May. T. D. A. 

 Cockerell. One specimen. 



cf Dark brown; back of thorax blackish; abdomen dotted, the 

 dorsum with a median darker stripe, on the last few segments this 

 darker stripe is pale in the middle; venter with a pair of dark sub- 

 median stripes on each segment; front legs very dark, others pale, 

 femora before tip and the tarsi darker; male genitalia and the setae 

 pale yellowish. Wings hyaline, veins white, the longitudinal ones 

 with some black streaks, hind margin alternately dark and pale; 

 many cross-veins, a number near the hind margin. The male with 

 costal area marked with black (not brown) spots, but not forming a 

 continuous streak; various dots along costal margin, streaks along 

 veins, and larger spots beyond the middle, two being larger than others. 



Expanse 20 mm. 



Hemerobiidae. 

 NosYBUS NAVASi, sp. nov. 



Type. — British Museum. Africa: Gold Coast, Aburi. Patterson 

 coll. 



Face yellowish, clypeus brownish, vertex with tufts of long white 

 hairs, also on the pronotum ; antennae as long as width of fore wings, 

 curled, tapering to tip, rich brown in color. Abdomen brown, with 

 median lobes above, with sparse white hair above and denser yellowish 

 hair on sides; the ovipositor yellowish, about one third the length of 

 the abdomen; legs pale, tarsi yellowish, basal half of hind tibia and 

 apical part of middle tibia dark, legs with mostly long white hairs, 

 but some dark ones. Fore wing with two faint broad oblique gray 

 bands, one before middle, one at the middle, and several large patches 

 beyond, the space between these marks snow-white; the cross-veins 

 black, and black haired, and a black spot at anal angle, other veins 

 mostly yellowish, with long hairs, mostly white, but some in costal 

 area are black. Venation very similar to N. nohilis Navas, but a 

 cross-vein connecting the second and third branches of the radial 

 sector toward tip, thus four veinlets in the outer series of gradates; 

 hind wings similar to N. nohilis, but no cloud back of the stigma, the 

 latter very distinct. Veins similar to N. nohUis, but the extra apical 

 cross-vein, the lack of cloud in hind wings, several details in color of 



