330 DIPTERA OP NORTH AMERICA. [PART II. 



Observation 1. — D. jjalsestriciis is very much like D. batillifer. 

 It differs from it in both sexes by the somewhat larger antennae, 

 and principally by the hind tarsi, which are black as far as the 

 extreme basis ; moreover the male has distinctly shorter fore tarsi 

 and their first three joints are somewhat stouter ; the cilia of the 

 hind femora are more scarce ; the hind tibiae are less thickened, 

 and the glabrous spot on their hind side is longer. The female 

 may be distinguished from the somewhat uncertain female of D. 

 splendidus, and from the as yet unknown female of D. splendidu- 

 lus by the pubescence on the sides of the abdomen, which is, to 

 a greater extent, of a pale color ; from the female of D. nudus it 

 differs by the under side of the first joint of the antennae not 

 being red. 



Observation 2. — The discovery of the present species makes it 

 necessary to mention, in the diagnosis of D. batillifer, the pale 

 color of the first joint of the hind tarsi, and the very dense fringe 

 of cilia on the hind femora of the male. 



46. D. melanocerus Loew. % and J. — iEneo-vin'dis, antennis 

 nigris, inferioribus oculorum ciliis fiavicantibus, ciliis tegularum nigris, 

 coxis anticis pedibusqne flavis, tarsis anterioribus inde ab articuli primi 

 apice, tibiarum posticarum'apiee tarsisque posticis totis nigris. 



•£, . Facie subaurea, tarsis simplicibus, femoribus posticis flavo-ciliatis. 



9 • Facie albicante, femoribus posticis non ciliatis. 



Metallic green ; antenna? black ; cilia of the inferior orbit yellowish ; cilia 

 of the tegulse black : fore coxae and feet yellow ; the four anterior tarsi, 

 from the tip of the first joint, the tip of the hind femora and the whole 

 hind tarsi black. 



% . Face almost golden-yellow ; hind femora with yellowish cilia. 



9 . Face whitish ; hind femora not ciliated. 



Long. corp. 0.20. Long. al. 0.20. 



Syn. Dolichopus melanocerus Loew, Berl. Ent. Zeitsch. VIII, 93, 86. 



Male. Metallic green, bright. Front bright green. Antennae 

 entirely black, rather large ; the third joint elongated-ovate, 

 rather of equal breadth. Face rather narrow, golden-yellowish, 

 but not shining. Cilia of the inferior orbit yellowish. Lamellae 

 of the hypopygium of medium size, ovate, whitish, with a narrow 

 black border, jagged on the apical margin and beset with black 

 bristles. Fore coxae yellow, somewhat blackened at the extreme 

 basis, and clothed on the front side with a black pubescence. 

 Feet yellow ; hind femora before the tip with a bristle, ciliated on 



