40 BULLETIN 31, UNITED STATES NATIONAL MUSEUM. 



lum, with fine black bristles. Abdomen shining- dark metallic green, 

 pile light colored, very short and thin. Legs brownish black ; tip of 

 lemora, base and tip of four front tibiae, yellow ; base and tip of hind 

 lemora, and the four front tarsi, yellowish brown. Wings lightly infus- 

 *:dte; stigma light yellow, reins near the base yellowish. 



One specimen. This species differs from C. Baroni, to which it is 

 juost nearly allied, in the auteunte being larger and lighter colored, the 

 arista pubescent, the facial tubercle smaller and much less projecting. 

 The pile of the front, thorax and abdomen is, moreover, much shorter. 



Cliilosia Baroni, u. sp. 



Habitat. — California, Washington Territory ! 



$ , 9 . Length, 7 to 9°^™. Deep shining black, with moderately 

 abundant whitish pile. Eyes pilose. Face on the sides somewhat 

 whitish pollinose, but without pile, except laterally between the lateral 

 groove and the eye ; near the middle a very large and convex tubercle; 

 not extending downward much below the eyes ; cheeks not broad. An- 

 tenu£e small, reddish brown, third joint nearly square; arista bare. 

 Frontal triangle somewhat swollen, with an impressed longitudinal 

 line; pile fuscous. Front shining, clothed with abundant whitish pile. 

 Thorax, on the post-alar callosities and tlie border of the scutellum, with 

 black bristly hairs ; the pile rather abundant and long. Abdomen 

 everywhere shining, more metallic on the sides ; the pile rather long 

 and abundant on the sides toward the base. Legs black ; tip of femora, 

 and tibiae, except a black ring, yellowish red, the hind tibiae sometimes 

 with only the base and the tip reddish ; basal joints of the middle tarsi, 

 and sometimes of the hind tarsi, yellowish red, the terminal joints black- 

 ish. Wings nearly hyaline, in the region of the cross- veins yellowish, 

 faintly blackish toward the outer part ; ^'eins at the base, except the 

 costa, yellowish. 



One male and three female specimens, Washington Territory and 

 California (O. T. Baron). The specimen from Washington Territory is 

 larger, and the third joint of the antennae is reddish yellow. 



Chilosia lasiophthalma. (Plate III, fig. 2.) 



CheUoaia lasioplithalmns Wilhston, Proc. Am. Phil. Soc, xx, 306, 1882. 

 Habitat. — Colorado ! 



$ . Length, 10 to 11""™. Frontal triangle moderately swoUen, with 

 an imi)ressed longitudinal line, an<l light yellowish pile. Antennae 

 brownish red, third joint not large, nearly square; arista bare, black. 

 Face deep shining black, with yellowish pubescence, nearly vertical be- 

 low the antennal prominence, tuberculate below; considerably produced 

 below the eyes ; a well-marked groove begins at the base of the an- 

 tennae, runs obliquely outward, to the eye, then curves downward near 

 the eye into the cheek. Posterior orbits below broadly dusted with yel- 

 low. Eyes thickly reddish yellow pilose. Thorax deep metallic green, 

 shining, thickly covered with yellow or reddish yellow pile, on the 



