June, 19 12.] Towxsexd: Muscoid Flies. Ill 



Its full characters will be given later. The uterus is very long and 

 slender, filled with elongate white eggs and stout white maggots in 

 single file. The maggot differs from the Compsilurine maggot in 

 having six short double transverse ventral rows of miscroscopic 

 faintly-colored platelets, minutely spined on their posterior and lateral 

 edges, the spines all directed more or less posteriorly. There is also 

 a transverse ventral bunched row of anal claw-like slender spines, 

 besides the few usual stout dorsal anal stigmatal hooks or claws. The 

 cephalopharyngeal skeleton differs from that of Compsilura in the 

 pharyngeal sclerites being less developed and not arcuate in profile, 

 the hypostomal and mandibular regions more elongated, and the 

 mandibular sclerite curved hook-like near tip. The egg, maggot and 

 cephalopharyngeal skeleton are shown in Figs. 6<S to 72 of Contr. Th. 

 Knowl. Mus. Flies. 



Type, TD1282 (fly, three slides of eggs and maggots). 



This is type of both genus and tribe Oxynopini. 



Euzenilla aurea, new genus and new species. 



Euzenilla aurea gen. et sp. now. TDJ50 — Ann. E. S. Am., Vol. IV, p. 148. 



One female, found Aug. 15, 1908, at Gipsy Moth Parasite Labora- 

 tory, Melrose Highlands, Mass., inside large out-door cage (shown in 

 Figs. 25 and 26, Tech. Ser. Bull. 12, pt. VI), where it had probably 

 issued either from the earth or from some host brought in from the 

 outside. Evidently a Xorth American species. The fly is small and 

 has the entire head, thorax and scutellum deeply golden-poUinose, 

 only the abdomen being obscure or cinereous. The uterus contained 

 about 75 to 100 maggots. The maggot is white, moderately slender, 

 thickly and evenly beset over whole body with short spines except 

 only at junctures of segments and on posterior half of dorsum. The 

 cephalopharyngeal skeleton is slightly suggestive of the Dexiid type, 

 but the pharyngeal sclerite is slightly widened and distinctly curved 

 in profile, thus not in line with hypostomal and therefore never form- 

 ing with the hypostomal sclerite a straight rod-like structure. }kIore- 

 over, the mandibular sclerite is stout claw-like apically, the claw being 

 notched on its superior edge, thus approaching the Zygosturmiine 

 type. It slightly approaches the Sardioceratine type in having a very 

 short and rudimentary pair of anal processes carrying the tracheae. 

 The maggot is shown in Fig. y6 of Contr. Th. Knowl. Muse. Flies. 



