from the Sacramento and White Mountains. 143 



band of third segment is narroudj interrupted. Pile of 

 abdomen yellow on the bright yellow markings, black on the 

 black and brownish-yellow markings. Legs yellow, the 

 front tibiffi and tarsi of both sexes black or brownish black 

 except extreme bases of tibiae ; the female with a tinge of 

 brownish on uppersides of all the femora and an elongate 

 brown spot on inside of hind tibife, the male with latter and 

 with extensive dark brown shading on uppersides of all 

 femora. Hind coxge in both sexes with a large yellow 

 pollinose spot on outside, and a linear transverse yellow 

 marking above this situated below and in front of the yellow 

 halteres. Wings nearly hyaline, faintly fuscous near tips, 

 faintly yellowish in basal half of subniarginal cell and in base 

 of marginal cell, also somewhat along veins at base of wing. 

 This species is very distinct from Williston's ^[. pulchra 

 from Guatemala. 



ConopidsB. 

 10. Oncomyia^ sp. 



One female, Rio Ruidoso, 6600 feet. On flowers of 

 Erysimum asperum, DC, July 3 [Wooton). 



It is impossible to say what species tiiis is, as the antennae 

 are entirely wanting and only a hind femur and a middle 

 femur and tibia remain of the legs. 



Length 4 millim. 



It differs from Loew's description of 0. loraria (not taking 

 into account the antennse or legs so far as they are wanting) 

 as follows : — Four black vittai on thorax, the outer ones 

 divided by suture so as to resemble two spots, the inner ones 

 more pollinose and less conspicuous. Abdomen soft black, 

 narrow hind margins of first to fourth segments cinereous 

 pollinose, the cinereous on fourth segment with a median line 

 running from it to front border of segment; fifth segment 

 very short, with narrower cinereous hind border ; sixth segment 

 wholly cinereous, except an oval median black space on 

 dorsum. Second to fourth segments each with a conspicuous 

 cinereous marking on side, that of second segment being 

 nearly round and situated on posterior corner, that of third 

 being elongate, nearly longitudinal, only very slightly oblique, 

 extending from anterior to posterior border, that of fourth 

 segment being elongate and strongly oblique, reaching from 

 front to hind border. There is also cinereous shading on 

 sides of first segment. 



11^ 



