No. 3.] HYGROCELEUTHUS AND DOLICHOPUS. 143 



Male. Length 4 mm., of wing 3 mm. Bright metallic green, somewhat 

 brassy. Proboscis piceous, palpi ferruginous at tip with few dark hairs. 

 Face very narrow, with eyes almost contiguous at middle, thickly overlaid 

 with ferruginous dust, shining. Antennae black, sericeous, not noticeably 

 bristly ; second joint closely applied to the third ; first joint equal to second 

 on inner side; third joint long, pointed, equal to first two together. Arista 

 finely pubescent, arising from middle of upper surface of second and third 

 joints taken together. Vertex green, shining. Infraocular cilia white. 

 Thorax with dorsum bright green, cupreous anterior to wing insertion, 

 dusted in front ; with an indication of two brown median longitudinal lines 

 in front. Abdomen dorsally bright green, cupreous tinged ; the posterior 

 margins of segments blackened. Hypopygium wholly 

 piceous, somewhat shining, and finely sericeous. La- 

 mellae in length equal to antennae, white translucent, 

 with a jagged, moderately wide black apical border, 

 and closely fringed with black hairs at tip. Pleurae, 

 sides of abdomen, and base of posterior fore coxae 

 dark green, glaucous. Fore coxae wholly yellow, 

 rather sparsely beset with pale hair, besides the apical 

 bristles. Legs plain, yellow ; hind femora with an 

 ante-apical bristle and ciliated below with not long FIG. 19. 

 yellow hairs ; hind tibiae stouter than the others, and male antenna and 

 with a long glabrous streak on. hind surface, black at 



tip for one-seventh its length ; hind tarsi entirely black, anterior pairs darker 

 towards tip, but not black. Empodia very small, silvery. Wings narrow, 

 tinged somewhat dark gray ; costa, at tip of first vein, with an evident knot; 

 fourth longitudinal vein not broken ; hind margin entire at tip of fifth vein ; 

 anal angle rather strong. 



A single male from New Bedford, Mass., collected May 30, 

 by Dr. Garry deN. Hough. 



Related to Loew's melanoccrus, but differs in the smaller 

 size, color of the hairs of the fore coxae, which are not black 

 at base, anterior tarsi not black, and the narrowed darker face. 



Dolicliopus rt'iu'descens, sp. nov. 



Green ; shining ; face broad, light brown, antennae black, with a plain 

 arista ; vertex violet ; cilia of inferior orbit white, of tegulae black ; legs 

 yellow, except tips of the tarsi and hind legs from outer portion of hind 

 tibiae, not ornamented except the ciliation of hind femora ; fourth vein not 

 broken. 



Length 4.5-5 mm., of wing the same. Bright green, shining, darker on 

 thoracic dorsum, almost bluish. Proboscis piceous, palpi brunncous. Face 



