8 PROCEEDINGS OF THE NATIONAL MUSEUM Vol. 6i 



14. (FEMALES) — Second principal segment underneatli with a large crescent- 



shaped area of short stubby spines on a prominence, behind which is a 

 concavity ; terminal hooks of last genital segment unsymmetrieal or only 



one present 15 



Second abdominal segment destitute of such spiny, swollen area ; hooks 

 of last genital segment symmetrical 16 



15. Large tropical species with only one genital hook, which is strikingly large ; 



fifth and sixth abdominal segments red (Guatemala) ._ signata Townsend. 



Small, more northern species, the left genital hook deeply grooved at base if 



present, usually broken off; tip of abdomen shining black (widespread). 



nana Townsend. 



16. The hooks on last genital segment attached below a square upper apical 



shoulder of the segment 17 



Last genital segment without such shoulder, sloping down to the hook 19 



17. With only 2 sternopleurals ; genital hooks as in armata (widespread). 



decora, new species. 

 With 3 sternopleurals 18 



18. The genital hooks pointing decidedly forward, gradually turned upward 



(widespread) armata, new species. 



The genital hooks turned upward from base, standing close to shoulder, the 

 tips divaricate (widespread) euchenor Walker. 



19. Usually with only 4, sometimes with 6, bristles on tergite of fourth abdomi- 



nal segment; large, common species (eastern) argentea Townsend. 



With more than 6 bristles on the tergite of fourth abdominal segment (wide- 

 spread) vulgaris, new species. 



CYLINDROMYIA DOSIADES Walker 



(Figs. 7, 22) 



Ocyptera dosiades Walker, List. Dipt. Ins., vol. 4, 1849, p. 695. — Van deb 

 Wxn:p, Tijdschr. Ent., vol. 26, 1883, p. 15, occurs in Quebec. — Giglio-Tos, 

 Ditt. del Messico, vol. 3, 1893, p. 3. — Coquillett, Revis. Tachin., 1897, p. 

 86. — Johnson, List Ins. New Jersey, 1899 and 1910; List Dipt, of Florida, 

 1895 and 1913.— Hine, Canad. Ent., vol. 36. 1904, p. 91.— Van der Wxjlp, 

 Biologia, Dipt., vol. 2, 1903.— Chagnon, Eutom. Student, vol. 2, 1901, p. 15, 

 occurs in Montreal. — Gibson, Entomol. Record, 1911, 1914, 1915, occurs in 

 Canada. — Van Duzee, Canad. Ent., vol. 43, 1911, p. 237, occurs in Kearny, 

 Ontario. — Winn and Beaulieu, Ins. Prov. Quebec, 1915, p. 141. — Britton, 

 Check-List Ins. Connecticut, 1920. — Cole and Lovett, List Dipt. Oregon, 1921, 

 p. 301. — Brimley, Ent. News. vol. 33, 1922, p. 232, occurs in North Carolina. 



Ocyptera euchenor Townsend, Journ. New York Ent. Soc, vol. 5. 1897, p. 

 176 (makes dosiades a synonym) ; Psyche, 1897, p. 149. 



Ocyptera euchenor, var. dosiades Townsend, Psyche, 1898, p. 212. 



Neocyptcra dosiades Townsend, Insecutor Ins. Menst., vol. 4, 1916, p. 32. 



The species has the usual red or yellow areas on the sides of the 

 abdomen, leaving a rather wide median black stripe, and the whole 

 posterior end of the abdomen shining black. 



The male has the posterior forceps entirely united, brown and 

 enlarged at base, where they bear a tuft of black hair; apically they 

 run out in a long yellowish point, slender in profde, grooved behind, 



