THE CANADIAN ENTOMOLOGIST. 35 



I know no other butterfly which moults three times and no more, but 

 I have verified the fact in this case repeatedly, keeping the larva? in 

 separate glasses and watching them through all their changes. I use half 

 pint glasses, with tin tops, for all my larva?, except the largest, as the 

 Papilios, and for these also in their earlier stages, so that it is easy to 

 examine and observe them. No larva moults without an interval of 

 abstention from food, and absolute rest for 24 or more hours, and at this 

 time the skin over head and second segment becomes white and swollen, 

 making it impossible that a moult should be coming on without oppor- 

 tunity of knowing it. Nearly all larva? moult four times, but Philenor alone 

 of the Papilios bred by me, moults five times. Some of the hybernating 

 larva? moult but four times, as Ncphele and Eurytris, others five times, as 

 the large Argynnids. Some Argynnids which have a summer as well as 

 winter brood, moult four times in the summer. So do Tharos and 

 Nycteis, but five times in the hybernating brood. Archippus moults four 

 times, as does L. Bachmanni, the species of Limenitis, and Apatura, 

 though perhaps A. Clyton in some cases passes five moults in the winter 

 brood. It is therefore something quite unusual for a species to be limited 

 to three moults only, as in- the case of Gemma. 



DESCRIPTIONS OF SOME NEW SPECIES OF TABANID^E. 



BY C. P. WHITNEY, MILFORD, N. H. 



Chrysops cuclux. 



% . Length 6^-9 m. m. Face and cheeks black, shining, separated 

 by yellow pollinose stripes. Frontal callus black, ocellar space blackish 

 ferruginous, the yellow pollen between somewhat infuscated. Palpi 

 blackish ferruginous. Antenna? : first two joints yellow, the second infus- 

 cated ; third black, base fulvous. Thorax and scutellum black with white 

 hairs, the usual stripes obsolete. Abdomen black, first two segments with 

 a pale yellow lateral spot, seldom attaining the posterior margin of the 

 second segment. The posterior segments with white hairs forming cen- 

 trally obsolete triangles. Venter black clothed with white hairs. Feet 

 black, sometimes tinged with ferruginous, posterior tarsi yellowish at base. 



