NATHAN BANKS. 39 



broken, the posterior part and the median part clouded witli brown, so that each 

 wing appears to have two brown spots near middle. In liiudwings the veins are 

 all pale, unmarked. In forewings tlie median is not bent toward the cubitus, so 

 that the basal cross-veins there are of subequal length. In hindwings the first 

 fork of the radial sector is as far out as the fork of median vein. In the fore- 

 wing the first radial sector is not connected to second near base, and there are 

 three or four branches from the cubital cell. Expanse 16-18 mm. 



Specimens from Williams, Arizona (Barber), July 23rd, and 



Mesilla, New Mexico (Morse). 



Boriomyia diKJuiicta Banks. — Head black, with two pale spots above, 

 ail ten use pale ; thorax pale, blackish on the sides, and some dark, almost connec- 

 ted, spots along the middle; abdomen blackish ; legs pale, darker toward the tips 

 of the femora, and the bases and tips of anterior tibiae. Wings with blackish 

 veins, dotted and spotted with white; three dark spots on the posterior margin, 

 all tending to form bands, the last one about middle of wing and more prominent 

 than others; some clouds near the pterostigma and on the outer gradate series; 

 the margin with alternating dark and white patches; pterostigma obscure; cross- 

 veins all dark ; hindwings not marked, venation blackish. Wings rather slender, 

 almost pointed at tip; median not bent toward cubitus at connecting vienlet; a 

 veinlet connecting median and first radial sector some distance out on latter; 

 first radial sector not connected to second ; three radial sectors, the third forked 

 twice before outer series of gradate veinlets; last gradate veinlet of inner series 

 coinciding with next to last. Expanse 20 mm. 



Specimens from Mt. Washington, New Hampshire (Slosson) ; 

 Slierbrooke, Canada (Begin) ; Ithaca, Axton (MacGillivray), and 

 Keene Valley, New York ; Kaslo and vicinity, British Columbia 

 (Currie). June to August. 



Boriomyia posticata n. sp.— Face brownish, vertex yellowish ; antenna 

 yellowish ; thorax with a broad median yellow stripe, and a broad red-brown one 

 each side; abdomen dark brown ; legs pale yellowish. Wings hyaline; venation 

 pale, marked with brown ; middle area of wing barely marked at all ; the costal 

 area somewhat marked, and the cross-veins bordered with brown ; the wing be- 

 yond the outer gradate series is more distinctly marked with small patches of 

 browu. Where the inner gradate series meets the lower branch of median there 

 is a large triangular brown spot, its tip extending out on the median vein ; behind 

 the cubitus the wing is very distinctly and obliquely barred with brown, two of 

 the bands being quite broad; pterostigma not distinct. Hindwings hyaline, with 

 apical venation brown. Three radial sectors, third forked but once before outer 

 gradate series; costal area moderately broad at base; the median is not bent to- 

 ward the cubitus at connecting veinlet. The wing is longer than usual. In 

 hindwings the first fork of radial sector is out as far as fork of median. Expanse 

 21 ram. 



One female from southern Utah. 



TEANS. AM. ENT. SOC. XXXII. DECEMBEE, 1905. 



