108 DIPTERA OF NORTH AMERICA. [PART II. 



ferior orbit pale ; fore coxse with the exception of the tip black ; wings 

 gray. Long. corp. 0.14—0.15. Long. al. 0.15. 



Syn. Pelastoneurus vagans Loew, Neue Beitr. VIII, 39, 5. 



Dark-green or blackish bronze-colored, moderately shining. 

 Face broad, with a snow-white dust, in the ? with a broad gray- 

 brownish middle stripe, which is wanting in the £ ; its lower part 

 convex. Palpi rather large, blackish, yellowish at the tip, on the 

 outside covered with a dense snow-white dust and black hairs. 

 Front covered with a brown dust, seldom entirely concealing 

 the ground color, which is steel-blue, except in the vicinity of the 

 upper corners where it is violet. Antennae not very long, the 

 third joint, however, which is rounded and distinctly hairy, is 

 rather large ; their color is red ; the upper side of the first and 

 the greater part of the third joint are black- brown ; sometimes the 

 upper side of the second joint has the same color. Arista feath- 

 ered with rather long hairs. Cilia of the inferior orbit whitish. 

 The color of the upper side of the thorax, in recently excluded 

 specimens, is more green, and shows then two longitudinal lines 

 of a violet color, which increase in breadth backwards and become 

 visibly divergent; in more faded specimens this color is more dark 

 bronze-black, and of the two violet longitudinal lines only the 

 hind part is often perceptible, which then becomes more extended. 

 The spot of white dust on each side, near the suture, and the usual 

 deep-black double spot immediately above the root of the wing, are 

 very striking ; upon the hind corner, which is of a brighter green 

 color, there is a spot of white dust in a diagonal direction ; how- 

 ever, it is very difficult to perceive. The extreme tip of the lateral 

 corner of the scutellum appears black, the elevated middle stripe is 

 usually green, and the slight depression on each side of the latter 

 more bronze-colored. I cannot perceive any hairs upon the sur- 

 face of the scutellum. Abdomen bronze-green, often somewhat 

 copper-colored ; the white dust in the vicinity of the lateral mar- 

 gin does not form any distinct spots. Coxae black with a bright 

 snow-white lustre ; fore coxae yellow at the tip to a rather large 

 extent, the middle and hind ones only to a very small extent. 

 Feet somewhat brownish-yellow; fore tarsi only at the tip, middle 

 and hind tarsi from the tip of the first joint, blackish-brown. Cilia 

 of the teguloe black. Wings in recently developed specimens 

 slightly tinged with gray, in faded ones visibly darker. The 



