SN'OW: DESCRIPTIONS OF XGRrH AMERICAN IRVPETI D.K. 163 



Trypcta sp. Osten Sacken, (Western Diptera, p. 345, ) in that the second 

 and third bands of the wing are not connected on the fifth vein. 



Trypetc occidentalis n. sp. (PI, \\\. f. ] 1 ). 



Male and female. Nearly related to T. palposa, Loew (Monogr. 

 I, p. 74, PI. n, f. 9). The four cross bands of the wing, the first of 

 which proceeding from the costa of the second costal cell, covers the 

 basal cross veins, are distinct and not connected along the fifth vein. 

 In palposa the first and second and the second and third bands are 

 thus united. The black on dorsum of thora.x is nearly concealed by 

 yellowish-grey pollen and thick a]:)pressed pile of same color. The 

 yellow before the scutellum is confined to a rectangular area. The 

 second segment of abdomen with two round black anterior spots on 

 each side of the middle, but no lateral spots as on following segments. 

 Female with abdominal spots as in the male with the addition of the 

 four borne on the sixth segment. Ovipositor yellow or brown with 

 darker tip, longer than the three posterior abdominal segments. Pile 

 of abdomen yellowish except the black bristle-like hairs on posterior 

 margins of segments and the shorter pile of the posterior half of the 

 last segment in the male. 



Length, 5.5 to 7 mm. 



Five specimens, California; nine specimens, Colorado (F. H. Snow 

 in August). 



In the figure the triangular infuscated area arising on the posterior 

 margin of the wing should be omitted: it is due in the insect to a 

 difference in the clearness of the hyaline rather than to any distinct 

 coloration. 



Trypeta florescentiae Lin, 



Otto, New York (Van Duzee, in July). 



CEdaspis montana n. sp. (PI. \'I, f. 5.) 



]\Lale. Head yellow. Front broad, dark yellow with slight green- 

 ish tinge, pile whitish, bristles black, on the sides anteriorly with 

 three. Antennae very short, third joint nearly as wide as long. 

 Cheeks very broad with some short black as well as whitish hairs; no 

 brown spot or stripe below the eyes. Occiput black above. Thorax 

 short, shining with the usual short bristle-like or stubble-shaped pile. 

 Metathorax black with a broad greyish dusted middle band. Abdo- 

 men grey jjoUinose and whitish pilose, longer than in related species. 

 Legs yellow, front femora somewhat thickened with long blackish pile 

 on under side and a fringe of whitish pile on upper side. The narrow 

 whitish-hyaline wings are without a distinct axillary spot and with 

 three brownish banils. The first band stops at the sixth vein and 



