878 LIST OF DIPTERA. 



Musca Gamelia, n. s.. mas. Cyaneo-viridis, capite fulvo albo 

 micante, thorace albo quadrivittato, scutello abdomineque purpu- 

 reo-cyaneis, hujus basi cyaneo-viridi, palpis fulvis, antennis pi- 

 ceis, pedibus ferrugineis, femoribus j'u/vis apice tarsisque nigris, 

 alis subcinereis basi fuscis. 



Body clothed with black hairs and bristles : head adorned with 

 white lustre, tawny in front ; epistoma slightly prominent; sides of 

 the face fringed with bristles for near half the length : eyes pitchy ; 

 fore part rather flat, its facets larger than those elsewhere: sucker 

 black, clothed at the tip with tawny hairs ; palpi tawny, beset with 

 black bristles : feelers pitchy, shorter than the face ; third joint 

 nearly thrice the length of the second, slightly decreasing in depth 

 from the base to the tip, which is rounded: chest bluish green, 

 adorned with four broad stripes of white lustre ; scutcheon purplish 

 blue : abdomen obconical, purplish blue, bluish green towards the 

 base, a little shorter and broader than the chest : legs ferruginous, 

 clothed with black hairs and bristles ; thighs dark tawny, with 

 black tips ; feet black ; foot-cushions tawny : wings slightly gray, 

 dark brown at the base; wing-ribs and veins black; tip cross-vein 

 forming a very slightly obtuse angle with the fourth longitudinal 

 vein, straight at the base, then very slightly curved inward, and 

 straight again for more than half the length to the tip, joining the 

 border a short distance above the tip of the wing ; lower cross-vein 

 with two curves, the first inward and almost imperceptible, the se- 

 cond outward and distinct ; scales gray, with pale yellow borders. 

 Length of the body 3i lines ; of the wings 7 lines. 

 a. Monte Video. Presented by C. Darwin, Esq. 



Musca Polisma, n. s., mas. Viridis, capite antice fulvo, thorace 

 vittis quatuor nigris, abdominis segmentornm marginibus posticis 

 cyaneo-purpureis, antennis fulvis, pedibus nigris, alis limpidis. 



Body green, clothed with black hairs and bristles: head co- 

 vered with a white bloom, bright tawny in front, clothed behind and 

 beneath with yellow hairs; epistoma slightly prominent; sides of 

 the face hardly beset with bristles at the base : eyes red ; fore part 

 nearly flat, its facets larger than those elsewhere ; sucker black, 

 clothed at the tip with tawny hairs : feelers tawny ; third joint 

 linear, rounded at the tip, more than four times the length of the 

 second joint; bristle black, deeply fringed, longer than the third 

 joint: chest adorned with four broad black stripes: abdomen obco- 

 nical, a little shorter and broader than the chest, adorned on each 

 side with white reflections ; hind borders of the segments bluish 

 purple : legs black, clothed with black hairs and bristles ; foot- 

 cushions pitchy : wings colourless ; wing-ribs pitchy ; veins black ; 

 tip cross-vein forming hardly more than a right angle with the 



