144 



2. Abdomen distinctly yellowish on the sides or at the apex 3. 



Abdomen and thorax wholly blackish, sides of the former some- 

 times tinged with reddish; base of wings yellow; length, 12 to 

 17 mm. Toronto, Canada; White Mountains and Franconia, 

 N. H.; Vermont; Xew Bedford, Mass.; Oswego, N. Y.; Colo- 

 rado; Montana; British Columbia; Washington; Oregon, and 

 California. (Aiisser. Zweif. Insekten, Vol. II, p. 285; 1830: 

 Tachina. Echinoniyia pice(iI)esvoidy, Essai sur les Myodaires, 

 p. -14; 1830. Echinomyia lapihvi Desvoidy, loc. cit. Tacliina 

 degenera Walker, List of Dipterous Insects, Part IV, p. 732; 

 1849. Jurinia nitida van der Wulp, Notes from the Leyden 

 Museum, Vol. IV, i^. 82; 1882. Echinomyia lugubris van der 

 Wulp, Tijdschrift voor Entomologie, Vol. XXVI, p. 20; 1883.) 



algens Wied. 



3. Second segment of abdomen bearing at most four marginal macro- 



chtetie 4. 



Second segment of abdomen bearing- at least ten marginal macro- 

 chibtje on the dorsum, abdomen wholly yellow, middle of dorsum 

 of second and third segments covered with black macrocha'ta^; 

 length, 11 mm. Colorado and Washington. (Trans. Amer. Ent. 

 So(;., Vol. XIII, p. 207; October, 1886 : Dejeania.) . .hy,stricosa\yi\\. 



4. First segment of abdomen on the sides largely or wholly yellow, the 



fourth yellow at least on the front corners 5. 



First segment wholly black, or at most with the hind angles nar- 

 rowly yellow; front tarsi of female broadly dilated; abdomen 

 black, the apex broadly, or the sides of the last three segments 

 and apex of the last, or only the sides of the second and third 

 segments, yellow; length, 10 to 13 mm. Canada; White Moun- 

 tains and Franconia, X. H. ; Xew Bedford, Mass.; Buena Vista, 

 X. J., and Xorth Carolina. (List of Dipterous Insects, Part IV, 

 p. 722 ; 1849 : Tachina.) Jiorim Walk. 



5. P.dpi only half as long as the proboscis beyond the basal articula- 



tion, front of male one and one-half times as wide as either eye, 

 head at base of antenniie much longer than at the vibrissie, front 

 projecting in front of the eyes one and one-half times the hori- 

 zontal diameter of the latter; abdomen of male yellow, middle of 

 first segment, a dorsal spot, and genitalia black; length, 12 mm. 

 Los Angeles County, Cal. (Bulletin Soc. Ent. France, p. cxli; 



1887 : Fahricia.) infumata Bigot. 



Palpi almost as long as the proboscis, front of male two-thirds as 

 wide as either eye, head at base of anteniue not longer than at 

 the vibrissiE, front projecting in front of the eyes less than the 

 horizontal diameter of the latter; abdomen yellow, usually 

 marked with a black dorsal vitta or row of spots; length, 10 to 

 14 mm. Franconia, X. H.; North Carolina; Colo., and Cali- 

 fornia. (Trans. Amer. Ent. Soc, Vol. XIX, p. 04; April, 1892. 

 Tachina sp., Brauer and Bergenstiunm in litt.).dakotensis Town. 



