114 Journal New York Entomological Society. [VoL xx. 



ton. The form of the maggot is unmistakably indicated in these early 

 embryos, being elongate-siibcylindrical and slightly tapered at cephalic 

 end. Examination with high power shows the chorion, when flattened 

 out, to be subovate, and the ends of the embryo of the egg-substance, 

 enclosed in the vitelline membrane, to protrude obtusely at each end, 

 thus giving the pointed effect to the egg as seen with the low power. 

 The chorion is conspicuously honeycomb-reticulate in almost perfect 

 hexagons, the whole evenly interspersed with fine punctulations. The 

 eggs and chorion structure are shown in Figs. i8i to i86 of Contr. 

 Th. Knowl. Muse. Flies. The spermathecas are large, and the ovaries 

 are composed of many ovarioles. The fly is slate-colored and polli- 

 nose, of practically the same size and general appearance as the North 

 American species of Cncphalia and the European Spallancania hcbcs. 



Type, TD877 (fly, slides of eggs and dissection of uterus). 



Described from TD492, 313, 576, 705, 706, 824, 877, 896, and 

 others. 



The present species is the type not only of this genus but of the 

 subfamily Cnephalomyiinae. 



Phasiopteryx montana, new species. 



Phasiopteryx sp. (Colorado), TD1791- — Ann. E. S. Am., Vol. IV, pp. 136-7. 



One female, labeled "' Col.," in U. S. N. M. collection. This fly 

 does not differ in external characters from Phasiopteryx bilinicki 

 B. B., of southern Mexico, so far as is yet known. The specimen was 

 in fact determined by B. & v. B as that species. The uterus is very 

 long and slender, irregularly coiled. In the dried specimen the coils 

 of the uterus adhered to the inside of the dorsal abdominal walls, and 

 the dark smoke-brown maggots were seen through the light yellow 

 of the tergites like dark specks in the body wall. The maggot is iso- 

 podiform, flat and broad-elongate when extended, showing lateral 

 emarginations due to the lateral segmental plates, in general outline 

 elongate-ovate to ovate, more pointed anteriorly, strongly suggesting 

 an isopod without appendages. Color pale reddish-brown to chestnut- 

 brown. There are thirteen recognizable segments, of which the 

 second apparently corresponds to segment II of Hewitt, for it is not 

 likely from the position of the cephalopharyngeal skeleton that it rep- 

 resents his segments II and III of Miisca. The thirteenth segment is 

 probably double and represents the last two primitive body segments. 



