DIPTERA. “126 
borders of the veins; wing-ribs ferruginous ; veins black ; poisers tawny. 
Length of the body 17 lines ; of the wings 26 lines. 
Cape. 
TropaNEA PERLONGA, Mas et Fem. 
Cana, capite subtus albido, thorace vittis quatuor nigris ornato, abdomine 
fusco segmentorum lateribus marginibus posticis ventreque canis, an- 
tennis pedibusque nigris, tibiis nonnunquam rufis, alis subcinereis, 
fusco variis, apice cinereis. 
Male. Covering of the head tawny above, whitish and clothed with 
whitish hairs bebind and beneath, beset behind the eyes with black bristles ; 
a few short black bristles on each side of the crown and on the tubercle of 
the eyelets ; face convex in front, clothed with pale yellow hairs and spines 
and with a few black bristles ; a few black spines on each side of the pe- 
vistoma: eyes bronzed; fore part nearly flat, its facets larger than those 
elsewhere: sucker black, clothed at the tip with short hoavy hairs; palpi 
black, clothed with long yellow hairs: feelers black ; first and second joints 
beset with black bristles; second red at the base, much shorter than the 
first; third slightly spindle-shaped, nearly as long as the first and the 
second joint and a little longer than the bristle: chest hoary, clothed with 
very short black hairs, beset on each side and behind with a few black 
bristles, adorned with four black stripes, of which the middle pair are nar- 
row and linear, and the outer pair elliptical and short: breast tawny, thinly 
clothed with hoary hairs: abdomen dark brown, more than twice the length 
of the chest, thinly clothed with very short hoary hairs, armed along each 
side with a few black spines, tapering from the base to the tip, which is 
black ; sides and hind borders of the segments and the whole of the under 
side hoary: legs black, clothed with very short hoary hairs, armed with 
black spines; shanks and feet covered beneath with tawny down ; shanks 
sometimes red ; claws at the base and foot-cushions tawny: wings slightly 
tinged with gray, brownish along the borders of the veins, darker gray at 
the tips ; wing-ribs ferruginous ; veins black, ferruginous at the base and 
along the fore border; poisers tawny. 
Fem. No black bristles on the face ; sides of the crown clothed with 
pale yellow hairs: abdomen much more than twice the length of the chest, 
pitchy and shining towards the tip: legs red, clothed with short hoary 
Ss 
