246 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.46. 



label "N. C." without other data. From the foregomg list it is 

 evident that this species is both widely distributed and occurs both in 

 early summer (June) and in the fall. 



HIPPELATES FLAVIPIS, var. PUSIO Loew. 



This variety differs from the type form in ha\dng the femora gen- 

 erally more or less blackened or browned and sometimes also the 

 middle of hmd tibia. In other respects it is as the type form, and 

 I can see no reason for separating them as distinct species. 



The localities of specimens in collection are Swansea, South Caro- 

 lina, August, 1911 (F. Knab); Lake Worth, Florida (M-s. A. T. 

 Slosson); Biscayne Bay, Florida (:Mrs. A. T. Slosson); Corpus 

 Christi, Texas, July 21 (H. P. Wood); Victoria, Texas, "on horse," 

 June 15 (J. D. Mitchell); Dallas, Texas, September 19, 1911 (F. C. 

 Bishopp); Sharpsburg, Texas, June 16; Maryland, collection Coquil- 

 lett; Las Vegas, Hot Sprmgs, Ai-izona, August 11 (H. S. Barber); 

 Archer, Florida, May; Tampico, Mexico, October 11, 1906 (F. C. 

 Bishopp) ; and one specimen from Ottawa, Canada (Beaulieu) . 



The type-specimen of hicolor Coquillett came from Lake Worth, 

 Florida, and in the same lot is a typical specimen of pusio. I have 

 seen specimens from Texas that agree in color with the form de- 

 scribed by Coquillett, and consider there is no ground for their 

 separation iromjiavipes. 



The variety pusio seems to have much the same range as flavipes 

 and fills up some of the blanks in the occurrence of the type form 

 (July-August) . 



With the single exception of hicolor the synonomy given herewith 

 is that given by Becker in his paper on the group, and I can see no 

 reason to doubt its correctness. 



Williston records a supposed variety of jiavipes ^ in a note as hav- 

 ing the legs almost entirely black, except the tarsi, and the antennae 

 wholly black. I should be inclmed to doubt this identification, 

 though it is not an impossibility. 



GROUP B. 



Species with Mesonotum Glossy Black, without Dusting; Legs Partly 



Black. 



6. HIPPELATES SCUTELLARIS Williston. 

 Hippelates scutellaris Williston, Ti-ans. Ent. Soc. Lond., 1896, p. 420. 



Male.— Front yellow, including the lower part of the very large shining black 

 triangle, which reaches very nearly to the base of the antennae. Antennae reddish 

 yellow; the arista black and very finely pubescent. Eyes sparsely, but not dis- 

 tinctly, pubescent. Face yellow, somewhat blackish in the middle. Cheeks very 

 narrow. Palpi yellow. Mesonotum wholly shining black, not pollinose. Scutellum 

 reddish, blackish at the base, its straight distal margin with two rather remote bristles. 



1 Trans. Ent. Soc. Lond., 1890, p. 420. 



