ADAMS : DIPTERA AFRICANA. 181 



linose in the center. Coxa3 and legs bluish black, mostly white 

 pollinose, front coxye shining externally, front femora much 

 thickened as usual, shining at apex, and with four strong spines 

 on under side at base, the usual small ones present ; front tibiae 

 yellow at base, the spur shining black, front metatarsi largely 

 yellow, and in the male with a pad of black hairs underneath 

 at tip, the following joints and those of the remaining tarsi 

 narrow yellow at base, four posterior knees with a yellowish 

 tinge, pulvilli white, hind metatarsi moderately swollen, free 

 from pile on under side. Wings hyaline, veins dark brown ; 

 last section of fourth vein slightly undulate, posterior cross- 

 vein straight, fifth vein scarcely attaining the margin of the 

 wing. Length, 4-5.25 mm. 



Numerous specimens ; May and June. 



C.ENIA. 

 (R. Desvoidy, Myod., 800 ; 1830.) 



Caenia albifacies, n. sp. 



Female : Front brown pollinose, lower corners opaque black, 

 with three fronto-orbitals on each side, the lower one small ; 

 face white pollinose, which color ascends up between and above 

 the antennae ; near the middle about half as wide as the front, 

 median carina distinct, five bristles on each side ; proboscis 

 black, palpi yellow; cheeks and occiput gray pollinose, former 

 with two rather strong bristles ; antennae black, third joint 

 thin, somewhat bent upon itself, arista with seven rays. Meso- 

 notum and scutellum brown pollinose, humeri and pleuroe gray 

 pollinose, one humeral, three dorsocentral, one presutural, two 

 notopleural, three supraalar on each side, with the usual pair 

 of prescutellar bristles ; scutellum with two pairs of bristles ; 

 hal teres yellow. Abdomen subopaque brown, with a slight 

 metallic reflection, with a sprinkling of gray pollen. Coxae and 

 legs bluish black, with gray pollen, hind femora shining on 

 inner side, extreme base of posterior tibiae, and hind metatarsi 

 yellow. Wings grayish hyaline, second vein nearly straiglit, 

 hind cross- vein straight, about its length from the wing mir- 

 gin, fifth vein not reaching the latter. Length, 2 mm. 



Three specimens ; May. 



