184 PROCEEDINGS OF THE ACADEMY OF [1898. 



and apical thirds; mesal extensor row has three prominent bristles 

 as arranged in II, 1. Middle femur has one large bristle at the 

 middle of the anterior surface, a few bristles in the flexor row of 

 each surface, and on the posterior surface a subapical transverse 

 group of three. Middle tibia has one on the anterior, II, 2, three 

 on the posterior, II, 3, and one on the flexor, II, 4, surface. Poste- 

 rior femur as usual. Posterior tibia has four on the lateral surface 

 (two flexor and two extensor, II, 5), and two on the mesal surface 

 11,6. 



Genus PARACOMPSOMYIA. 



Very close to Compsomyia. In the table of genera of Brauer and 

 Bergenstamm it would fall with Compsomyia from which it differs as 

 follows : wings not hyaline but, toward base and costa, black or very 

 dark brown ; thorax without longitudinal black stripes ; the vibrissal 

 angles are not as far dorsad the mouth edge as in Compsomyia-, 

 there are no vibrissa? ventrad the principal vibrissa; the orbital 

 bristles are much smaller than in Comjisomyia and are directed 

 laterad instead of ventrad ; the sterno pleural bristles are 1-1 instead 

 of 2-1. 



Paracompsomyia nigripennis nov. sp. 



Four females, taken August 23, 1894. Large metallic blue, violet 

 or green flies with yellow heads, black legs and with the costal 

 border and basal half of the wings black or very dark brown. 

 Length of body 11 to 12 mm., of wing 10 mm. Width of head 5 

 mm. ; of front 1.7 mm. at base of antennse, 1.8 mm. at vertex ; fron- 

 tal vitta 1 mm. at widest point, 0.7 mm. at base of antennse. Looked 

 at squarely from in front the dorso- ventral diameter of the head 

 (height) is 4.2 mm., the vertex extends 0.2 mm. dorsad the dorsal 

 border of the eyes, the dorso-ventral diameter of the eye is 2.5 mm., 

 of the bucca 1.5 mm. The second antennal joint is 0.3 mm. long, 

 the third is 1.1 mm. 



Head. — Color : — dorsal two-thirds of geno- vertical plate is polished 

 ferruginous, the ventral third as also the gena?, buccoe, vibrissal 

 ridges and facial fossa are a paler, yellowish-brown with a thin 

 hoary coating. Vitta ferruginous. Antenna? yellowish-brown. 

 Ocellar prominence and an adjoining triangular area of varying 

 size at the dorsal part of the occiput ferruginous to yellowish-brown 

 varying in different specimens. Posterior orbit silvery. Palpi 

 yellow. Proboscis dark brown to black. 



