26 S. W. WILLISTON, M. D. 



Three specimens from Connecticut agree perfectly with Say's descrip- 

 tion. Its small size, yellow pile of head, thorax and scutellum ; the rather 

 broad third joint of the antennae, and very short second joint will enable 

 it to be distinguished without difficulty. Length 11-15 mm. 



44. Dasyllis tergissa Say, J. Aoad. Phil, iii, 74, 5; Coiiipl. Wr. ii, 67. 

 (Laphria.)—'H.eiid, thorax, a broad band on 2-4 abdominal segments, anterior 

 coxae and tibiae yellow pilose. Length 18-25 mm. 



Four specimens from Connecticut are typical. 'Another has but very 

 little yellow pile on the legs and abdomen ; two more very large speci- 

 mens have the abdomen wholly black, and but a few yellow hairs on 

 the legs. 



45. Dasy^llis thoracica Fab.; Wied., Auss. Zw. 1, 511, 21 [Laphria). — Head, 

 scutellum, abdomen and legs black pilose ; thorax yellow pilose. Length 18-20 mm. 



Eight specimens, Connecticut, Penna. 



46. Dasyllis uiiicolor n. sp. — % . — Black shining, everywhere yellow pilose, 

 rather more fulvous on the thorax. Wings tinged with brown, hyaline on basal 

 portion. Length 19 mm. 



One specimen, Washington Territory. 



There is but little to add to this diagnosis. I do not perceive a black 

 hair or bristle anywhere. In size and shape it does not differ from 

 specimens of astur. 



47. Dasyllis sacrator Walker, List, etc., ii, 382. 



Thorax, basal portion of the abdomen, and legs in large part, yellow 

 pilose. It will be confounded with tergissa only. It is smaller ; the 

 beard wholly, the hair on the face wholly or in large part black. The 

 wings are not usually as dark colored. The species varies consid- 

 erably. I have ten specimens taken near the base of Mt. Washington 

 (July 25-30). The color of the hair in some is fulvous, in others light 

 yellow, that on the face in some specimens is largely intermixed with 

 yellow. In most of the specimens there is considerable yellow hair on 

 the hind legs, but in others it is wanting. The light colored hair of the 

 abdomen is usually confined to the second and third segments, in some it 

 extends into the fourth and fifth, and in others it is confined to a small 

 spot on the side of the second segment, or may be wholly wanting. 

 Such specimens may not be easily distinguished from thoracica ; in all 

 my specimens of the latter the body is more robust, the black abdominal 

 pile is longer and more abundant, and the hair of the legs has rarely any 

 intermixture of yellow. 



48. Uasyllis posticata Say, Long's Bxped. App. 374, 1 ; Compl. Wr. i, 255 

 {Laphria). — Head, thorax, and before the tip of abdomen yellow pilose. 



