130 MELANDER AND BRUES. [Vot. I. 



The peculiar anal lobe of the male wing easily identifies this 

 species. The female is not so easily distinguished, but can be 

 recognized by the characters given above. 



Hygroceleuthtis amnicola, sp. nov. 



Female. Length 4.5 mm., of wing 4.5 mm. Of a bright metallic green 

 with cupreous reflections. Palpi light yellow with black hairs. Face evenly 

 overlaid with golden dust. Antennae black with lower half of first and sec- 

 ond joints yellow. The difference in color is sharply marked. First joint 

 hairy above, with a rather large yellow projection from inner side. Second 

 joint tipped with a fringe of black hairs which are longer below. Front 

 metallic brassy green. Upper half of the postocular cilia black, lower pale. 

 Thorax shining green, not much dusted in front, disc somewhat cupreous ; 



the two narrow approximated lines 

 are left green. Sides of thorax glau- 

 cous, becoming more piceous in all 

 the coxae. Front coxae with black 

 hairs on whole anterior face. Mid- 



FIG. 6. -H.amnicol.,: wing of female. dle and hind femora yellow ; fore 



femora black for nearly proximal 



two-thirds. All the tibiae yellow, infuscated at tip ; the darkening especially 

 prominent on the hind legs. Front tarsi black from tip of first joint ; mid- 

 dle tarsi with first and second joints yellow, their tips black, remaining 

 joints black ; hind tarsi black from base of first joint. Wings long and 

 narrow, greatly prolonged beyond tip of fourth vein ; the fourth vein with 

 a very strong bend and continued obliquely forward. Halteres and tegulae 

 yellow, the cilia of the latter long and black. 



One specimen, Colorado, Grizzly Creek, North Park; col- 

 lected by Mr. C. F. Baker. 



Although this species is represented by a single female 

 specimen, it is so distinct that there is no hesitancy about its 

 position. The wings reach further beyond the fourth vein ; the 

 angle of the fourth vein is more nearly rectangular ; the coxae 

 are darker and the femora blacker than in any other female 

 Hygroceleu tJi us . 



Amnicola differs from Aldrichii thus : middle tarsi are not 

 compressed and are largely yellow ; the front femora and coxae 

 are much darker ; the wings are hyaline and more extended 

 beyond the veins, and the fourth vein is more sharply bent. 



