30 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 69 



sternum pubescent ; spur on hind trochanter of male small, pointed ; 

 hind femora but little thickened, regular in outline, spinose beneath 

 on nearly entire length, more slender in female; discal cross vein 

 joining discal cell beyond its middle. Some variation occurs in this 

 species besides that noted under ejuncida elongata. Two males, 

 Waldoboro, Maine, and Big Moose, New York, are somewhat more 

 robust in appearance, have more black on the second and third ter- 

 gites and only the last two tarsal joints of fore tarsus black. One 

 male and female. Falls Church, Virginia, and Washington, District 

 of Columbia, besides the differences noted above, have a yellow arista. 

 Two females, Washington State, have brighter and more quadrate 

 abdominal markings. A male. El Paso County, Colorado, agrees 

 very closely to typical ejuncida. In some material sent by Mr. 

 Johnson are a number of specimens from New England which are 

 also more robust in appearance. One normally colored female and 

 three of the elongata variety are amongst them. The latter may 

 easily be mistaken according to original descriptions for ohscura 

 {=flavifrons) or anthreas. 



Distnhution. — Common throughout the eastern United States and 

 Canada. Has been recorded from Alaska and a number of western 

 States. 



Type. — Lost. 



XYLOTA EJUNCIDA, variety ELONGATA Wil!iston 



This variety is based on Williston's Pennsylvania specimen of 

 elongata, which he later redetermined (but did not publish), as 

 anthreas Walker. A full discussion is given in the introduction. 



This variation is rather a rare one occuring apparently onlj^ in 

 the female. It is characterized by having the yellow abdominal 

 markings entirely obscured by bluish-black metallic coloration. A 

 female of the type series of Loew's quadrlmaculata{— ejuncida) has 

 an entirely dark abdomen. Three specimens sent by Mr. Johnson 

 and one from New York are rather large and robust, corresponding 

 to the large males noted under elongata. 



Distribution. — Pennsylvania: locality? (Williston) ; Perdix, May 

 27, 1911 (W. S. Fisher) ; New York, Wells, July 26, 1918 (D. B. 

 Young); New Hampshire, White Mountains (Williston); Maine: 

 Bar Harbor, June G (C. W. Johnson), Capens, July 7 (C. W. 

 Johnson). 



Type. — In U. S. National Museum. 



XYLOTA CONFUSA, new species 



Male. — Very similar to Xylota ejuncida in appearance. Differs 

 chiefly in its somewhat larger ocellar triangle; less pollinose frontal 

 triangle; short arista and broad face, arista being a little shorter 



