LATH YROPITTH.VLMUS. 85 



With this species begins a group of closely allied small species, 

 of which there are six in the collection. The thorax is strongly 

 strip-ad as in quinquelineatus, the stripes being equally strong in 

 both sexes ; the body is short and quadrate, while in all the 

 preceding groups it is elongate and conical. 



The present species was originally described from Gaboon ; there 

 are three females from West Africa, Obuasi, Ash.mti, v.-viii. 1907. 

 " caught in swamp " i Dr. If. M. (Irak" 



84. Lathyrophthalmus flaveolus, Biyot (1880). 



Very near the preceding, but of greater size and darker colour- 

 ing, with the black thoracic stripes broader than the light ones. 



Originally described from Senegal; some specimens of both 

 sexes from West Africa, Obuasi, Kumasi and Eduadin, Ashanti, 

 i.-x. 1907, "caught hovering in swamp or near stream, the cT 

 hovering round head" (Dr. W. M. Graham). 



85. Lathyrophthalmus xanthopus, sp. n. 



$ . Length of the body 11 mm. 



Closely allied to the two preceding species, but distinguished by 

 the black thoracic stripes being somewhat more shining, and by the 

 third and fourth abdominal segments being wholly black, without 

 yellow bands. 



Head black, densely grey pollinose, only a little shining near the 

 vertex ; frons clothed with dark hairs, which become paler near the 

 fore border; before the ocelli there is a trace of a small black 

 transverse band ; antenna! tubercle very little developed, wholly 

 pollinose ; face entirely pollinose, the pollen grey on the sides, 

 yellowish in the middle and below, disposed on the sides in oblique 

 wa ves ; hair on the sides whitish ; tubercle yellow, not very promi- 

 nent : face but little produced, epistoma not deeply bilobate, the 

 opening of the buccal cavity small and round ; proboscis black ; peri- 

 stoma narrow, shining black, white-haired behind ; antennae entirely 

 yellow, the third joint short-oval, subquadrate, with a dark upper 

 border ; arista long, bare, dark reddish ; eyes dark red, with very 

 numerous and small round black spots, only on the upper edge a little 

 confluent ; the hairs on the eyes are very short and scarce, brown, 

 confined to the upper edge, the greater part being bare. Dorsum of 

 thorax yellowish-grey pollinose, with four broad longitudinal black 

 stripes, which have a purplish sheen in the middle and are velvet- 

 black on the sides ; the two middle stripes are close together and 

 become broader behind, the two lateral stripes are broader than 

 the dividing-lines and become narrower behind ; notopleural region 

 aeneous and somewhat shining ; pleura grey pollinose, with a dark 

 horizontal band across the mesopleura ; hairs short, pale yellowish. 

 Scutellum yellow, darkened at the base, clothed with yellowish 

 hairs, but with the broad middle band of black hairs very distinct 



