858 LIST OF DIPTERA. 



ridge of the face ferruginous ; sides covered with tawny down, 

 fringed with bristles on nearly half the length : eyes red ; fore part 

 flat, its facets not larger than those elsewhere : sucker black, pitchy 

 and clothed with tawny hairs towards the tip ; palpi tawny, long, 

 slender, beset with short black hairs : feelers pitchy, much shorter 

 than the face ; third joint ferruginous, linear, pitchy at the base, 

 rounded at the tip, more than twice the length of the second joint ; 

 bristle black, downy, more than twice the length of the third joint; 

 its first joint short : chest and breast very dark ferruginous : disk of 

 the chest black, its sides armed with a few black spines : abdo- 

 men obconical, a little longer and broader than the chest, very dark 

 ferruginous, tinged with blue ; fore borders of the segments covered 

 with while bloom ; hind borders black ; a black stripe and a fur- 

 row along the middle ; tip notched : legs black, clothed with black 

 hairs and bristles ; foot-cushions dark tawny : wings colourless ; a 

 large blackish brown spot near the base ; wing-ribs and veins ferru- 

 ginous; veins black towards the tips; tip cross-vein forming a right 

 angle with the fourth longitudinal vein, having an almost imper- 

 ceptible inward curve from thence till near the tip, where it is 

 slightly curved outward, joining the border at some little distance 

 above the tip of the wing ; lower cross-vein having a very slight 

 inward curve at one-third of its length, almost straight from thence 

 to the tip ; middle cross-vein with a clouded knob on the outer 

 side near the base ; scales dingy yellow, with black borders. 

 Length of the body 6 — 7 lines ; of the wings 16 — 18 lines. 

 a. New Holland. 



DExrA Idesa, n. s., fern. Viridis, capite thoracis lateribus abdomine- 

 queferrugineis, abdominis segmentis viridi quadrimaadatis, vitta 

 marginibusque posiicis nigris, palpis fulvis, antennis ferrugineis, 

 pedibus nigris, libiis ferrugineis, alis limpidis. 

 Body clothed with black hairs and bristles : head pale ferru- 

 ginous : a black stripe fringed with bristles between the eyelets and 

 the feelers ; epistnma prominent ; sides of the face covered with 

 tawny down, fringed with bristles for near half the length ; eyes 

 dark red ; fore part convex, its facets a little larger than those else- 

 where : sucker black, clothed at the tip with tawny hairs ; palpi 

 tawny, long, slender, beset with short black hairs : feelers pale fer- 

 ruginous, not more than half the length of the face ; second joint 

 armed with a long bristle ; third joint linear, rounded at the tip, 

 more than twice the length of the second joint; bristle black, 

 hardly downy, much more than twice the length of the third joint ; 

 its first and second joints short : chest and breast green ; sides fer- 

 ruginous, clothed with tawny hairs ; sides of the hinder part and 



