ABT. 7 AMEKICAN MUSCOID FLIES IN VIENNA MUSEUM ALDEICH 13 



Abdomen ovate; first and second segments with one smallish erect 

 median marginal pair of bristles, third with a marginal row of 

 about 12 larger; fourth with erect coarse hairs becoming bristly at 

 hind margin; no discals on second and third, but the hairs on 

 whole dorsal surface are rather dense, evenly placed, and become 

 more erect near the median line. On the venter of the third seg- 

 ment, the inflexed tergite bears on each side a distinct rounded tuft 

 of long hairs. 



The legs are of ordinary structure, the claws and pulvilli mod- 

 erately elongated; middle tibia with two bristles on outer front side- 

 and a smaller depressed one below them. The hind tibiae are obvi- 

 ously ciliated, with one bristle below middle row. 



Wings ordinary; first posterior cell rather wide open well before 

 tip of wing ; third vein with three or four setules at base, the otliers 

 bare. 



The species is not represented in the National Museum. The 

 North American species Zenillia eudryae Townsend shows hardly a 

 single difference throughout; three instead of four lateral scutellar 

 bristles is the only one I find. Gofrcelia gnava Meigen of Europe 

 is also closely related, and as the genus Carcelia dates from 1830 it 

 certainly includes Sisyro'pa as a synonym. Townsend based his 

 genue Oxexorista on eudryae^ but later restricted the genotype ta 

 a single specimen which he named thmnpsonV This specimen 

 shows only slight differences from eudryae, hence Oxexorista also 

 becomes a synonym of Carcelia, It was the judgment of Aldrich 

 and Webber^ that Carcelia itself should be a synonym of Zenillia 

 Robineau-Desvoidy. 



89. ZENILLIA RUFIVENTRIS Brauer and Bergenstamm 



Sisyropa rufiventris Brauee and Beegenstamm, Denk. Wien. Akad. Wiss., 

 vol. 58, 1891, p. 346. 



One male, " Beske, Brasilien," with Brauer and Bergenstamm 

 label. Undoubted type. This goes readily in Exorista of authors 

 (for which ZenllVm is used by Aldrich and Webber). Not in Na- 

 tional Museum. It is closely allied to cheloniae Rondani, and hence 

 may be referred to the subgenus Parexorista. There is no outer 

 vertical bristle. The body surface and chaetotaxy are considerably 

 damaged, although the head is perfect. Front 0.24 of head width 

 by micrometer. The apical half of (he fourth abdominal sograent 

 is shining black, apparently contrasting vritii basnl half. Most oi the 

 dorsum of the abdomen and nearly all the venter red. Middle tibia 

 with one bristle on outer front side. 



^Proc. Em. Soc. Wash., vol. 14, 31)11'. p. 105 : aii«l I'lOf. Uiol. Soc. Wash., vol. liS, 1V)15, 

 p. 21. 



" Proe. U.. S. Nat. Mus., vol. C3, art. 17, Vd'2l, p. 7. 



