142 THE CANADIAN ENTOMOLOGIST. 



35. Brachypalpus inarmatiis, n. sp. 



Very similar to Bracliypalpus fro/ilosus, Loew, but differs in the fact 

 that the coxte, femora and tibi^ of the male are entirely unarmed. 



Male. — Antennae dark reddish-brown, third joint slightly darker on 

 the lower basal corner ; first joint shining ; arista yellow, its apex fuscous. 

 Face front and cheeks bluish-black, somewhat shining, covered, except a 

 broad oblicjue stripe on cheeks, with silvery pollen, more dense on the 

 front, which in some lights obscures the ground colour. Occiput below 

 with long yellowish pile. Face in profile concave, but the concavity not 

 receding nearly as low as the lower border of the eyes nor as far back as 

 the eye margin. Dorsum of thorax light shining green with four cupreous 

 stripes, the median ones more slender and all abbreviated behind the 

 middle ; the pile yellow and rather abundant. The scutellum and an 

 irregular, poorly defined area in front of it on the dorsum cujjreous. 

 Abdomen shining purplish-black, with yellow pile longer on the sides of 

 the second segment and on the posterior margin of the fourth, where it 

 forms a conspicuous fringe. In the middle of the second segment there 

 is a small, slender, opaque spot not reaching the posterior margin. Legs 

 black ; femora long golden pilose, the extreme apex of the femora, the 

 narrow base of the tibitv, and the tarsi, except the last two joints, black. 

 Posterior femora and coxse without spurs or protuberances, the former 

 moderately incrassate. Wings distinctly infuscated on the anterior half. 



One male specimen : Vollmer, Idaho, May 30th, 1896 ; Prof. J. M. 

 Aldrich. 



There are differences between this species and frontosus in the face, 

 which is uniformly poUinose, but bare and shining below the antennae in 

 that species, in the presence of a golden fringe on the posterior margin of 

 the fourth abdominal segment, in the pile everywhere being golden and 

 not gray as in that species, the posterior femora are less curved and the 

 tibiic are darker than in my specimens of frontosus. 



It has occurred to me that this might be simply a dimorphic form of 

 B. frontosus., holding the same relation to that species as the form Bautias 

 holds to Mallota cinibiciformis. Fall. From the differences enumerated 

 above, however, it does not appear that such can be the case. 



36. Xylota btirhata, Loew. 



A single male specimen [Santa Cruz Mountains, California, i8th 

 April] agrees so well with the description of this species that 1 am con- 

 strained to think it is this species, although it lacks the posterior coxal 



