54 Bulletin of the Brooklyn Entomological Society Vol. XI t 



From Falls Church, Glencarlyn and Chain Bridge, Va., in June. 



Dasyllis partitor n. sp. — Head mostly yellow hair; thorax with yellow 

 hair, shorter and more sparse in front; the scutellum black; yellow hair 

 in front of the halters and in front of the wings; the apical half of the 

 abdomen yellow haired, leaving only the small apical segment black ; legs 

 with some yellow or tawny hair on the basal parts, but the apex of the 

 tibiae and the tarsi with red hair above. Length i8 to 20 mm. 



From Princeton, British Columbia, July (Russell). 



Dasyllis sackeni n. sp. — Black; the hair in front of the halters and in 

 front of the wings is wholly black ; head yellow haired except black on 

 vertex behind ; legs wholly black haired ; thorax yellow haired above, 

 scutellum black haired; abdomen black, but with a band of yellow just 

 before tip, leaving the apical segment black. Superior appendages slightly 

 excavate behind, lower edge deeply rounded. Length 15 to 17 mm. 



From Brookdale and Walnut Creek, Calif. (Davidson) ; and San Fran- 

 cisco and Contra Costa, Calif. (Edwards). 



Dasyllis divisor n. sp. — Closely resembles posticatus, but the scutellum 

 is yellow haired ; the yellow on the abdomen is confined more to the tip ; 

 and the abdomen is generally more slender than in posticatus. The 

 same size. 



From Black Mts., Swannanoa River, N. C, May; and from Illinois and 

 Pennsylvania. 



Dasyllis insignis n. sp. — Black ; clothed with black and much yellow hair, 

 head with yellow hair, some black on the lower face ; thorax with yellow 

 hair above, but a band of red hair on the posterior part and on the scu- 

 tellum ; hair in front of halters yellow ; that in front of wing base mostly 

 black; abdomen (except basal two segments) with yellow hair; legs, with 

 front and mid coxae, and all of femora and tibiae bearing some yellow 

 hairs, but not dense anywhere. Superior male appendages broadly rounded 

 below, outer side oblique, not excavated. Length 14 mm. 



From Labrador ; the mss. name of Loew, who had given names to sev- 

 eral of the species here described as new, as well as to champlaini and 

 to cinerea. 



Dasyllis californica n. sp. — Black; head yellow haired, except black on 

 the lower part of face and a few black bristles on the vertex ; thorax 

 above yellow haired, scutellum with black hair, hair in front of halters 

 and in front of wing base yellow; abdomen with two or three segments 

 near the tip yellow haired ; legs with some yellow hair on coxae, femora 

 and tibiae of front pair, and on the middle tibiae. In the male the abdomen 

 is very slender, and the superior appendages plainly but evenly excavate 

 on the outer edge. Length 18 mm. 



From Lake Tahoe, Calif. (Vachall) ; and a part of the type material of 

 D. astur from Webber Lake, Yosemite, and Sierra Nevada, Calif. (H. 

 Edwards). 



Dasyllis macquarti n. sp. — May be the species recorded by Macquart 



