THK CANADIAN ENTOMOLOGIST. 227 



style one-fifth as long as the third antennal joint. Thorax yellow polli- 

 nose, that each side more gray, marked with three broad black stripes ; 

 pile of thorax short, sparse, mixed black and yellow, the bristles black ; 

 pleura gray pollinose, its pile white. Scutellum black pollinose, that on 

 the margin grayish-yellow, its pile sparse, yellow, the four bristles black. 

 Abdomen shining, except the first segment, base of the second and sides 

 of the first four segments, which are gray pollinose ; pile of the first four 

 segments mixed yellow and black, that on the remaining segments wholly 

 black. Wings grayish-hyaline, stigma yellow, fourth posterior cell broadly 

 open. 



$ Same as the $ , except that the abdomen is wholly silvery-white 

 pollinose, its pile wholly yellow ; hypopygium yellow, its pile yellow and 

 black. Length, 10 to 13 mm. Los Angeles County, Cal. One male and 

 two females, in June. 



Psilocephala Slossoui, n. sp. — $ Black, the palpi, halteres, femora, 

 tibiae, and base of tarsi, yellow. Face and front grayish-brown pollinose, 

 front with two velvet black spots at its middle adjacent to the eyes ; pile 

 of front, occiput, mouth parts and of antennae whitish, bristles of antenna? 

 and of upper part of occiput black ; third antennal joint three-fourths as 

 long as the first, scarcely wider than the second, first joint nearly twice 

 as wide as the second, the style one-third as long as the third joint. 

 Thorax brownish-gray pollinose, marked with two narrowly separated 

 median grayish-black vittae and with a much broader lateral one ; pile of 

 thorax light-yellow, the bristles black ; pleura whitish pollinose and white 

 pilose. Scutellum brownish-gray pollinose, white pilose, its four bristles 

 black. Abdomen grayish-brown pollinose, that on apex of each segment 

 broadly light-gray, the pile whitish. Wings gray, lighter in the middle of 

 the cells, leaving a dark-gray border to the veins ; stigma brown, fourth 

 posterior cell broadly open. 



Length, 10 mm. New Hampshire (Johnson). A single female speci- 

 men, collected by Mrs. A. T. Slosson, after whom the species is named. 



Psilocephala Aldrichii, n. sp. — $ Black, the knob of the halteres, 

 hypopygium, tibiae and base of tarsi yellow, posterior margin of the 

 second and third abdominal segments white. Front shining, its lower 

 corners, not extending halfway to base of antennae, white pollinose, like 

 the face. File of mouth parts and of occiput white, that of the cheeks 

 largely black, bristles of upper part of occiput and of the antennae also 

 black. First joint of antennae three-fourths as long as the third, the 



