J. R. MALLOCH 189 



bristles, the surface otherwise almost bare; frons at base of antennae very 

 decidedly i>i'otuberaut, the parafacial about twice as wide at that point as 

 at lower margin of eye; antennae large, extending almost to mouth-margin, 

 third joint broad, at least twice as long as second; arista subnude, with an 

 elongate swelling at base, second joint ahiiost twice as long as thick; cheek 

 about one-sixth as high as eye, the lower margin with two or three series of 

 bristles, the upper one posteriorly and the upper and lower at anterior margin 

 of eye being upwardly curved; vibrissa strong, four or five strong bristles 

 below it and a number of strong setulae parallel to the series, several of them 

 above level of vibrissa; proboscis stout and short. Thorax with five or six 

 pairs of very closely placed setulae in the acrostichal series in front of suture; 

 prealar bristle over half as long as the one behind it; sternopleurals 2:2. 

 Abdomen subcylindrical; hypopygium small; fifth sternite with the processes 

 short, each with a distinct rounded swelling on the inner side at middle, 

 the inner margin of which is glossy and apparently chitinized, apices of 

 processes rounded, their surfaces with short, moderately dense hairs. Fore 

 femur with short setulose hairs -on antero-ventral surface, without strong 

 bristles; fore tibia with one antero-dorsal, two postero-dorsal and two postero- 

 ventral bristles; fore tarsus distinctly longer than fore tibia; mid femur with 

 one or two bristles on antero-ventral surface at or beyond middle and four 

 or five at middle on postero-ventral surface; mid tibia with one antero-dorsal, 

 two postero-dorsal and three or four postero-ventral bristles, the latter weak; 

 hind femur with a complete series of moderately long bristles on antero- 

 ventral surface, four or five on middle third, and one near tip on postero- 

 ventral surface; hind tibia with from five to seven bristles of irregular lengths 

 on antero-dorsal surface, three or four on postero-dorsal surface, a series of 

 from five to seven short bristles on antero-ventral surface, and from three 

 to six setulose hairs on basal half of posterior surface. Costal thorns small, 

 veins three and fovu- subparallel, outer cross-vein slightly curved. 



Female. — Similar in color to the male; the dorso-central vitta on abdomen, 

 however, is slightly tapered from anterior to posterior margin on each seg- 

 ment. 



Frons a little over one-third of the head-width, orbits wider than in the 

 male, each in addition to the five infraorbitals with three supraorbitals, 

 the anterior one, and sometimes the second, directed f(jrward; cruciate bristles 

 absent, the triangle as in the male, not extending to mitldle of interfrontalia. 

 Abdomen tapered apically, the ai)ical segment without thorns. Otherwise 

 as in male except that the tarsal claws and pulvilli arc much shorter. 

 Length, 7 to 7.5 mm. 



Type. — cP; Swarthmorc, Pennsylvania, May 5, 1907, [A. X. 

 S. P., Type no. 6233]. Allotype.— 9 ; sanie locality, May 6, 

 1906. Paratypes.—Femahs, topotypical, June 18, 1905; one male 

 and one female, Auburndale, Massachusetts, May 22. 



This species differs from any in the genus, so far descril)ed 

 from this country, in the shape of the head and fifth abdominal 

 sternite and in armature of the fore tibia. 



TRANS. AM. ENT. SOC, XLVI. 



