228 THE CANADIAN ENTOMOLOGIST. 



latter narrowly lanceolate, six times as long as the style. Thorax some- 

 what shining, marked with two white pollinose vittse scarcely half as wide 

 as the interval between them, and sometimes indistinct ; pile of thorax 

 and of scutelium whitish or yellow, that of the pleura white ; scutellum 

 bearing four black bristles. Abdomen lightly white pollinose, its sides, 

 except on the first segment, shining, the pile white, that near the apex 

 below and on the hypopygium sometimes partly black. Wings hyaline, 

 the veins and stigma light-yellow ; fourth posterior cell closed and 

 petiolate. 



$ Same as the $ , except that the abdomen is not wholly pollinose, and 

 its pile is largely black. Length, 7 to 8 mm. New Jersey (Johnson), 

 Montana, Wyoming (Aldrich), and California. Four males and one 

 female, in July. I take pleasure in naming this species in honour of Mr. 

 J. M. Aldrich, from whom one of the specimens was received. 



Psilocephala JoJinsoni, n. sp. — ? Black, the femora, tibiae, base of 

 tarsi, and posterior margin of the second, third, fourth and fifth ventral 

 segments, yellow. Front shining, each lower corner and the face white 

 pollinose ; bristles of antennae and of upper part of occiput black, pile of 

 lower part of occiput and of the mouth parts white ; first antennai joint 

 slightly longer than the third, the latter one-fourth wider than the second, 

 style one-fifth as long as the third joint. Thorax grayish-brown pollinose, 

 marked with two widely separated light-gray pollinose vittae, the sides 

 broadly shining ; pile of thorax short, and like the bristles, black ; pleura 

 white pollinose, its pile white. Scutellum shining, except the gray polli- 

 nose margin, its bristles black. Abdomen shining, the first segment 

 lightly white pollinose, posterior margins of the second and third segments 

 white, a large white pollinose spot on each side of the fifth segment, the 

 two spots almost contiguous ; pile of abdomen mostly black ; venter 

 white pollinose, pile of the first three segments white, the rest black. 

 Wings smoky-brown, the middle of some of the cells lighter, stigma 

 darker brown, fourth posterior cell closed and petiolate. 



Length, 9 mm. Florida. A single specimen received from Mr. C. W. 

 Johnson, to whom it gives me pleasure to dedicate this interesting 

 species. 



Psilocephala marcida, n. sp. — o* Black, the antennae, proboscis, palpi, 

 halteres, hypopygium, femora, tibiae except apex of each, and base of 

 tarsi, yellow, the femora and abdomen sometimes brown ; posterior margin 

 of the second, third, fourth and fifth abdominal segments, both dorsally 



