8 S. W. WILLISTOX. M. I). 



abdomen black or blackish; legs and abdomen yellowish red. Wings in the male 

 tinged with brown, darker, sometimes dark brown in front toward the base: in 

 female the basal half yellowish, the posterior and distal half brownish." (Face 

 nearly plane, without tubercle. Wings comparatively narrow ; first posterior cell 

 coarctate, fourth posterior cell closed and petiolate). Length 10-12 mm. 



I have a single male specimen from Kern Co., that I believe to be 

 this. It agrees very well indeed with the original description, except 

 that all the femora from the very trochanters are reddish yellow, the 

 venter is red and the wings are dark brown before the anterior cross-vein, 

 beyond which there is a large space very nearly hyaline ; the posterior 

 portion for the whole length has a distinct blackish tinge. However, 

 these differences are such as Baron Osten Sacken himself noted, or an- 

 ticipated. The only reason that I am at all doubtful of the identity is 

 that the author did not speak of the closed and briefly petiolate fourth 

 posterior cell, a character, however, that is probably more or less varia- 

 ble. The hind femora in this species are stouter and more thickened on 

 the proximal portion than in the preceding species. 



DIOCTRIA. 



4. Dioetria iiitida n. sp. 



'^ 9- — Black shining, thorax yellow pilose and pollinose, mystax black; tibiae 

 yellow, tips black. Length 11-1.3 mm. 



Much like D. albius but larger and all the tibiae light reddish-yellow, 

 except the tips. Face bright golden yellow, mystax and pile of the front 

 black. Antennae in structure quite like those of D. (ilhius, black. 

 Thorax rather thickly clothed with golden-yellow pollen and pile. Pleu- 

 rae shining black, with four rather small patches of dense yellowish-gray 

 pollen, and similar ones on all the coxae, the front and middle coxae with 

 white pile. Abdomen deep, shining, somewhat metallic, black. Legs 

 black, front and middle tibiae except the immediate tips, and the hind 

 pair a little more broadly, reddish-yellow. Wings nearly uniformily. 

 blackish, veins yellow at the base. 



Four males and one female, Washington Territory. 



5. Dioetria albius Walker. 



From comparison of five specimens from Washington Territory with 

 thirty from Connecticut, T am at a loss to find differences that will 

 justify their separation. 



6. Dioetria Naekeiii n. sp. 



% .—Black, basal half of wings light yellow, distal half blaekisli ; anterior 

 femora below, tip of middle and hind femora, four front tibiae except their tip, 

 and basal half of hind tibiae reddish-yellow. Length 7 mm. 



Face yellow above, silvery below ; mystax, pile of front, of antennae, and the 

 beard white. Antennae black, rather acute at tip. Dorsum of thorax densely 



