Lonchopteridae. 15 



Thorax varying about as in lutea, from almost quite yellow, through 

 forms with one or three stripes to such with thorax quite dark grey; 

 but when there are three stripes these are always broad and con- 

 fluent on the front part, so that distinctly three-striped forms do not 

 occur; scutellum yellow with dark middle stripe, sometimes more 

 dark; postscutellum generally grey. Pleura yellow or more or less 

 dark. Abdomen yellow with a middle stripe, which is sometimes 

 rather narrow; the stripe may then widen more and more, until ab- 

 domen is quite dark grey; abdomen is thus never dark in front, yel- 

 low behind as in varieties of lutea. Legs yellow, tarsi darkened to- 

 wards the end; front tarsi most darkened, but the tibiæ not dark on 

 the apical part as in lutea; the chætotaxy of the legs is somewhat 

 differing from that in lutea; the coxæ have similar bristles; the front 

 femora have likewise three bristles above on the apical part, middle 

 femora one on the antorior side in the middle, and hind femora two 

 on the antero-dorsal side, besides the bristles around the apex; the 

 front tibiæ have two dorsal bristles and one posterior above the 

 middle, middle tibiæ two antero-dorsal, one postero-dorsal above the 

 middle and one ventral near the apex; hind tibiæ have as in lutea 

 about four more or less dorsal and a couple of small ventral bristles 



^ t ijjf.ii'.trsssi 1:1 JM c ^-, 



Fig. 4. Wing of L. furcata 9- 



on the apical part; besides the tibiæ have apical or subapical bristles; 

 hind metatarsus has two ventral bristles at the base and one at the 

 apex; the bristles on tibiæ are smaller than in lutea. Wings slightly 

 yellowish; anal vein terminating behind the base of the discai fork; 

 the upper branch of the discai fork spinulous to near the base. 

 Halteres yellow. 



According to de Meijere the male is similar; abdomen has the 

 last segment twice as long as the preceding; the hypopygium is small, 

 the apical lamellæ considerably longer than broad, with bristles at 

 the margin, also at the inner margin; the posterior inner lamellæ 

 (gonapophyses) are large, reaching to the end of the apical lamellæ, 

 somewhat lobe-shaped; the anterior are short lobes. 



Length 2,3 — 2,5 mm. 



