ART. 9 TWO-WIXGED FLIES OF TRIBE MILTOGEAMMINI ALLEN 15 



flowers, Townsend having taken specimens in the Southwest on Cicuta 

 occidentalis and Solidago trinervata. The WTiter on one occasion, 

 captured several specimens basking on siinht fohage of shrubs and 

 small trees in Massachusetts. I have examined one specimen bearing 

 a record of rearing from Trypoxylon politum Say. The host relation- 

 ships indicated by Coquillett,^ Brimley,^" and Malysev" are possibly 

 correct but should be verified. 



PACHYOPHTHALMUS DISTORTUS, new species 



Male. — Front at narrowest 0.22 of head width (measurements of 

 five as follows: 0.20, 0.21, 0.21, 0.23, 0.24); frontal vitta black, 

 narrowest near the middle, where it is about two-thirds width of 

 parafrontal, diverging slightly to vertex; parafrontals with a dense 

 inner row of about fifteen bristles, outside of which is a row of smaller 

 bristles and sparse, scattered hairs; vibrissae about halt length of 

 second antennal joint above iront edge of oral margin; antennae 

 black, extending two- thirds distance to vibrissae, third joint slightly 

 longer than second; arista thickened on basal third; penultimate 

 joint nearly twice as long as wide; facial ridges with scattered hairs 

 on lower half; in profile, bucca wider than parafacials and equal to 

 about one-sixth the eye height; front projects about one-fourth eye 

 diameter; paralacials bare save for a few sparse hairs; proboscis 

 about two-thirds head height, stout; labella fleshy; palpi black. 

 Thorax gray pollinose, with the usual three broad black vittae extending 

 as far as the scutellum; three, or sometimes four postsutral dorso- 

 central bristles; scutellum with three marginals, of which the inter- 

 mediate pair is larger than the other equal pairs. Abdomen black, 

 densely gray pollinose to apices of segments with three large, shining, 

 irregular black spots on each of the last three segments; first and 

 second with strong median marginal pair of bristles and a few laterals 

 becoming weaker towards the median line; third and fourth segments 

 with marginal row of fourteen to sixteen bristles. Genitalia (pi. 3, 

 fig. 14) black; inner forceps slightly divergent from their base; claws 

 moderately flattened laterally, in profile curved abruptly forward near 

 the tip; outer forceps tapering uniformly to rounded tips about 

 equal to size of tips of inner forceps; penis laterally compressed, 

 with the rolled edges of apical aperture much narrower than width 

 of penis in the middle; anterior claspers nearly as long as the penis, 

 extremely crooked, with very fine hooked tips, best seen from the 

 rear. Wings of usual venation; third vein with two to tlu-ee small 

 hairs at its base. Legs black; hind tibia with complete row of 

 about nine irregular bristles on outer surface. 



» U. S. Bur. Ent., Tech. Ser., No. 7, p. 19, 1897. " Hort. Soe. Ent. Ross., vol. 40, p. 51. 



'» Ent. News, vol. 33, p. 24, 1922. 



