NO.12S0. NEW NORTH AMERICAN DIPTERA—COQUILLETT. 109 



tellum somewhat polished, not pruinose; abdomen gray pruinose, the 

 iirst segment, a streak in posterior corners of the second and thii-d, a 

 median spot on front end of the hist three segments and a dot at base 

 of each bristle and hair, polished black; wings h3^aline, calypteres 

 whitish; length, 3 mm. 



Female. — Vertex one and one-half times as wide as either eye; bod}- 

 gra}' pruinose. a small brownish median spot on the last three abdom- 

 inal segments and a brownish streak in the hind angles of the second 

 and third, indistinct brownish dots at bases of the hairs and bristles; 

 length, 4 mm. 



A specimen of each sex collected by Prof. J. M. Aldrich. 



IIal)Hat. — Moscow, Idaho. 



7}/7>t.— Cat. No. 6208, U.S.-N.M.^ 



OESTROPHASIA CALVA, new species. 



Yellow, the thorax brownish yellow, a spot above the neck, and in 

 the male a transverse row of three spots beliind middle of mesonotum, 

 black; abdomen in the male with a median spot on each segment and 

 a streak at the hind angles of the last three, in the female with hind 

 margins of first three segments and one to three spots on the fourth, 

 black; vertex in male as wide as distance between the two posterior 

 ocelli, only one row of about five. bristly hairs outside of the frontals; 

 in the female the vertex is slightly over twice as wide as either eye, 

 one row of bristly hairs outside of the frontals, and outside of this a 

 second row of four orliital bristles; thorax slightly, the abdomen 

 highly, polished, hairs of abdonien short, depressed, first two segments 

 with a marginal pair of bristles, third with a marginal row, the fourth 

 nearly wholly covered on the apical half; wings whitish hyaline, the 

 base to discal cell and in front of fourth vein to apex of first, yellowish 

 brown, a brown crossband begins in apex of marginal cell and extends, 

 greatly narrowed, over the hind crossvein where it turns basally along 

 fifth vein, covering slightly over the apical half of the discal section; 

 third vein bristly less than half wa}^ to small crossvein, first posterior 

 cell closed at the wingmargin; length, (5 mm. One male and two 

 female specimens. 



U(iUtat.—\\ WXmmr^. Arizona (July 17, H. S. Barber); and Ottawa, 

 Canada (W. H. Harrington). 



7}/7><A— Cat. No. 6209, U.S.N.M. 



^ Hyalomyodes tricmguUjera has not been described in the female sex; the vertex is 

 as wide as either eye, the body opaque, gray pruinose, that on the first abdominal 

 sfirment very thin and not concealing the ground color, the hind margin of the sec- 

 ond segment and a dot at base of each bristle and hair polished black. 



Lencodoma neomexicana was not known to me in nature when the Revision of the 

 Tachinidae was published; on page 69 it was given as a synonym of senilis, but it is 

 evidently distinct, and will readily l)e recognized by the white pruinose last two 

 alxloniiual segments. 



