ART. 9 TWO-WINGED FLIES OF TEIBE MILTOGRAMMINI ALLEN 67 



and one female, Animas Pass, New Mexico, 6,500 feet; all in the 

 collection of the National Museum. 



This species is a Rocky Mountain and Sierra Madra form concern- 

 ing tlie biology of which very little is known. Townsend states that 

 the Sierra Madra specimens were taken in the pine zone at about 

 7,000 to 7,500 feet elevation. The host relationships are not known. 



Two additional males collected July 25, 1925, at Summit, Montana, 

 by J. M. Aldrich; the}' were found at the edge of a cascade on smooth, 

 wet rocks in the sun. Altitude about 5,000 feet. 



SPHENOMETOPA COCKLEI (Townsend) 



Arabiopsis cocklei Townsend, Canad. Ent., vol. 47, p. 286, 1915. 



Male. — Front at narrowest 0.34 of head width (measurements of 

 three 0.33, 0.33 and 0.35) ; inner orbits much narrower at vertex 

 than at base of antennae, with pronounced concavity to accommodate 

 bulge in sides of front, and divergent to bucca; frontal vitta barrel- 

 shaped in outline, at middle three to four times width of parafrontals, 

 concolorous with parafrontals which are gray pollinose, n. dark 

 reflecting spot below the ocellar triangle on each side of the vitta; 

 the proclinate ocellar bristles scarcely differentiated from the sur- 

 rounding hairs; a row of about four proclinate and two reclinate 

 orbital bristles of variable sizes; posterior part of front bare of 

 bristly hairs; vibrissae scarcely differentiated from surrounding 

 bristles, inserted slightly above oral margin; facial ridges divergent, 

 with strong macrochaetae on lowest two-thirds; antenna black, 

 extending nearly to vibrissae, third joint three to three and one- 

 half times as long as second; arista thickened on basal three-fifths, 

 penultimate joint nearly twice as long as wide; in profile, width of 

 bucca slightly greater than that of parafacials and equals one-third 

 eye height, front projects one-half horizontal diameter of eye; 

 parafacials setulose on upper half; bucca densely black setulose; 

 palpi black, filiform. Thorax blue-white pollinose over dull black, 

 with two narrow median vittae and densely covered with long 

 bristh' hairs; scutellum with three pairs of marginal bristles of which 

 the intermediates are the longest; strong preapicals present. Ab- 

 domen strongly flattened, truncate at apex; black, the sides densely 

 blue-w^hite pollinose, middle of dorsum with a broad black vitta 

 which becomes narrower towards apex, a single pair of small bronzed 

 spots, lateral to the vitta, on each of the intermediate segments; 

 first two segments with two to four long median marginal bristles 

 and one or two smaller laterals; third and fourth segments each 

 with a marginal row. Wings slightly infuscated towards base; 

 apical cell narrowly open at tip; last section of fifth vein not nearly 

 half as long as preceding section; two to three bristly hairs at the 

 base of the third vein. Legs black; basi tarsus of fore leg with con- 



