298 Journal New York Entomological Society, tvoi. xxi. 



RHICNOESSA Loew. 



Cheeks broad, fully two thirds as wide as the eye-height, the eyes relatively 

 small and horizontally oval 2. 



Cheeks narrow, much less than one half as wide as the eye-height, the eyes 

 relatively larger; hairs and bristles black 4. 



2. Hairs and bristles of entire body and of the legs white ; white-cinereous ; 



the cheeks, face and front whitish in ground-color and not cinereous ; 

 the femora dusky and last tarsal joint black. 2.5 mm. (Mass., R. I., 



N. J.,* Tex.*) albula Loew. 



Hairs and bristles of the thorax black; cinereous black species 3. 



3. Hairs of abdomen white ; front relatively broad ; mesonotal pollen somewhat 



yellowish; legs yellow, the last tarsal joint and the apex of the 

 femora darkened ; third section of the costa only a little longer than 

 the fourth section ; penultimate section of the fourth vein a little 

 longer than the ultimate section of the fifth vein. 2.5 mm. (West 

 Ind.) (Anthomysa cinerea Williston, 1896, nee Rhicnoessa cinerea 



Loew, 1S62, from Europe, Asia and Africa.) willistoni new name. 



Hairs of abdomen black ; front relatively narrow ; thorax and abdomen 

 cinereous; femora cinereous black, the tibise and last tarsal joint 

 dark ; third section of the costa much longer than the fourth ; penulti- 

 mate section of the fourth vein shorter than the ultimate section of 

 the fifth. 1.7s mm. (Mass.*) zvhitmani new species. 



4. Front narrow, red, with brownish orbits becoming white next to the eyes ; 



antennae yellow; legs yellow, the last tarsal joint brown. 2-2.5 mm. 



(West Ind.) (Anthomysa.) vanthopoda Williston. 



Front broad, dull brownish; antenna blackish; femora and tibiae black; 

 eyes vertically but obliquely oval. 2 mm. (Wash.*) 



luilichioides new species. 



Rhicnoessa whitmani new species. 



Male. — Length 1.75 mm. Cinereous black, including the occiput, vertex, 

 coxae and femora. Front testaceous, the orbits whitish, the sides of the front 

 slightly rounding to narrow the front below, the lowermost (fourth) fronto- 

 orbital minute, four pairs of interfrontal bristles, postverticals convergent. 

 Face and cheeks white, the latter two thirds as broad as the height of the 

 horizontally oval eyes ; the distance from the mouth to the root of the antennae 

 about one half the length of the front and vertex; oral margin with a single 

 row of five black bristles, the foremost porrect but not otherwise differen- 

 tiated as a vibrissa. Antennae small, reddish, the outer joint a little dusky a' 

 its end, the short arista black. Proboscis dark at the base, the labella yellow ; 

 palpi yellow. Thoracic bristles rather strong, four dorsocentrals, acrostichals 

 in four rows, lateral setulae strong; one sternopleural, one superior meso- 

 pleural, a vertical row of four bristles along the posterior edge of the meso- 

 pleurae. Abdomen cinereous, not at all reddish, the hind margin of the posterior 

 segments narrowly whitish, its bristles black; hypopygium small, concolorous. 

 Coxae and femora cinereous black, the tibiae blackish, the tarsi except the apical 



