650 LIST OF DIPTERA. 



and bristles : wings slightly gray, adorned with two brown bands, 

 which are united on the fore border, but do not reach the hind bor- 

 der ; wing-ribs and veins black ; poisers pitchy, with tawny knobs. 

 Length of the body 2^ lines ; of the wings 5 lines. , 



a. Mexico. Presented by E. P. Coffin, Esq. 



Psilopus trigemmans, n. s., mas. Cyaneo-viridis, capite cyaneo- 

 purpureo, abdomine fulvo, apice viridi-ceneo, antennis fulvis ? ar- 

 ticulo 3° nigro, pedibus fulvis, alis limpidis. 



Body beset with black bristles : head bluish purple, covered 

 with white down : eyes bright red : mouth tawny : feelers black 

 first and second joints tawny ; bristle a little shorter than the chest 

 chest bluish green ; hind part blue ; sides and breast covered with 

 white down : abdomen bright brassy green, tawny for more than 

 half the length from the base ; appendages tawny : legs pale tawny, 

 clothed with very short black hairs ; feet somewhat darker ; wings 

 colourless, very indistinct ; wing-ribs and poisers tawny ; veins 

 brown. Length of the body If line ; of the wings 3J lines. 



Psilopus nigrofemoratus, MSS. Cyaneo- aut aureo-viridis , antennis 

 nigris capite duplo longioribus, pedibus nigris tibiis fulvis, alis 

 limpidis. 



Head and chest bright bluish green, armed with black bristles : 

 head covered in front with white down, clothed beneath with white 

 hairs : eyes red : mouth tawny : feelers black, about twice the 

 length of the head : breast and underside of the abdomen covered 

 with white bloom : abdomen golden green, blue at the base, cop- 

 pery at the tip : legs black, beset with a few black bristles ; shanks 

 tawny, with black tips : wings colourless : wing-ribs tawny ; veins 

 black ; poisers yellow. Length of the body 1 J line ; of the wings 

 2i lines. 



Var. /3. Chest golden green, bluish green behind: abdomen 

 coppery green : tips of the thighs and the whole of the shanks 

 tawny. 



Var. y. Abdomen bright green or bluish green; a bronze band 

 on the fore border of each segment. 



a. North America. Presented by the Entomological Club. 



b. Nova Scotia. From Lieut. Redman's collection. 



