LIST OF DIPTERA. 649 



adorned with a green spot on each side : eyes red : mouth and feel- 

 ers black ; bristle a little shorter than the chest : hind part of the 

 chest tinged with blue and purple ; sides and breast covered with 

 white down : abdomen at the tip purple in the male, bluish purple 

 in the female ; hind borders of the segments in the male adorned 

 with black bands : legs pitchy, beset with black hairs and bristles ; 

 hips and thighs green, the former covered with white down : wings 

 slightly gray, indistinctly marked with brown towards the tips of the 

 fore borders and along the cross-veins ; wing-ribs pitchy ; veins 

 black ; poisers of the male pitchy, of the female tawny. Length of 

 the body 1^ — li line ; of the wings 3| — 4 lines. 



a. New York. Presented by E. Doubleday, Esq. 



b. Trenton Falls. Presented by E. Doubleday, Esq. 



Psilopus quadricolor, n. s. Viridis, capitis vertice abdominisque 

 basi pur pur eo-cy amis, thorace purpurea, antice aureo-viridi, ab- 

 dominis fasciis nigro-ameis, antennis piceis, femoribus viridibus, 

 tibiis fulvis, tarsis piceis, alis limpidis fusco bifasciatis. 



Body beset with black hairs and bristles: head bright green, 

 purplish blue on the crown, clothed with white down in front : eyes 

 red : mouth pitchy : feelers pitchy ; bristle as long as the chest : 

 chest purple, golden green in front ; sides and breast covered with 

 white bloom : abdomen bright green, bluish purple towards the 

 base ; bronze-black bands occupy the fore borders of the segments 

 and successively increase in breadth, especially on each side from 

 the base to the tip of the abdomen : legs beset with black hairs and 

 bristles ; hips and thighs green ; shanks tawny ; feet pitchy : wings 

 colourless, adorned with two brown bands which are joined together 

 on the fore border, but do not reach the hind border nor the tip of 

 the wing, the second is broader than the first; wing-ribs pitchy; 

 veins black ; poisers tawny. Length of the body If line ; of the 

 wings 3^ lines. 



a. Brazil. 



Psilopus inficitus, n. s. Viridis, capite purpureo, abdomine purpu- 

 reo, abdomine purpureo-cyaneo, fasciis nigris, antennis pedibus- 

 que nigris, alis subcinereis fusco bifasciatis. 



Head and chest beset with black bristles : head purple, fringed 

 about the mouth with hoary hairs : eyes red : mouth and feelers 

 black ; bristle a little longer than the chest : chest green; sides and 

 breast covered with whitish down : abdomen deep purplish blue ; 

 sutures of the segments black : legs black, clothed with black hairs 



