188 Journal New York Entomological Society. [Vol. vl 



femora yellow, the posterior ones except the extreme base and apex, brown ; tibiae- 

 yellow, the hind ones brown ; tarsi brown, the first joint and basal half of the second 

 joint of the hind ones, yellow; all femora and the front tibiae bare, middle and hind 

 tibiae thinly beset with very short bristles ; pulvilli rather large, empodium wanting. 

 Halteres brownish, the apical portion of the knobs white. Length, 8 mm. 



Ft. Grant, Arizona. A single specimen collected July 19, 1897,. 

 by Mr. H. G. Hubbard, after whom this interesting species is named. 

 Type No. 4071, U. S. Nat. Museum. 



LIFE-HISTORY OF THE TWO FORMS OF CERURA 



NIVEA. 



By Richard E. Kunze, M.D. 



In Professor Packard's Monograph on Bombycine Moths, this Ceru- 

 rim Moth is mentioned as a varietal form of C. cinerea. Under date 

 of August 14, 1897, the doctor wrote me, that " there were two pale or 

 white forms of cinerea in my region, whose larvae need to be identified." 

 Professor Packard in his monograph states, that the white color of art 

 example of C. nivea, in Mr. Palm's collection, from the Virgin river,, 

 southern Utah, is evidently the result of the action of bright sunlight, 

 heat and dryness. The same conditions exist in the Salt River Valley. 

 Phoenix and Yuma hold the record for highest temperature of Arizona, 

 that of the former being 117 Fahrenheit in the shade, while that of 

 Yuma exceeded it by two or three degrees. This information I ob- 

 tained from U. S. Weather Bureau of this City, and an attache of the 

 same formerly stationed in Yuma. My examples of nivea were all col- 

 lected at light in Phoenix up to the end of June, a few emerged from 

 collected cocoons, and of those sent six to Mr. Charles Palm for deter- 

 mination. The reply stated, that according to the synopsis of Neumoe- 

 gen and Dyar, they were Centra nivea, variety of cinerea. Since my 

 correspondence with Professor Packard, have taken the autumn brood 

 of this insect, from which I bred from ova to pupae and imagines, and 

 will now give as a result, that this moth has an undisputed right to rank 

 as a species, and not as varietal form of cinerea. In its earliest larval 

 stages the resemblance is nearer that of cinerea than any other Cerurine, 

 while the last two stages more nearly resemble larva? of C. mu/tiscrij>ta. 

 In the East have bred from ova and collected larvae of any number of 

 C. cinerea, multiscripta and borealis and well remember the larval life 

 of those species. 



