THE CANADIAN ENTOMOLOGIST. 199 



Sannina, sp. (?) 



On July 7 a great number of pupa skins of what seemed to be an 

 .■Egerian were found sticking out of the ground near roots of mesquite 

 ( F. juliflora), on the mesa near college. The perfect insects had all 

 emerged. Digging in the ground failed to disclose any pupse. I believe 

 this is a sesiid which bores the mesquite roots. 

 Thyridopteryx, sp. 



Our native bag-worm is found here principally on small trees of black 

 locust ( Rob'mia pseudacacia), which have been brought in. It is also 

 found on apple, and I have found its bags on tornillo ( Frosopis pubes- 

 cens). The bags of those on locust are woven on the outside with the 

 leaf-stems of the locust ; those on tornillo have the thorns of the tornillo 

 beautifully woven in. A large number of bags cut open, March 15, 1891, 

 revealed only larvae, which are thick-bodied, brown or black, and an inch 

 or more in length. Through September it was noticed that many of these 

 larvfe, with their cases attached, were crawling on the ground in the 

 vicinity of locust trees. October 5 a large number of these were placed 

 in a breeding cage. They crawled to the top of the cage, and there 

 fastened their bags by spinning a small quantity of silk. In this 

 suspended condition they passed the winter. Nine male moths issued 

 from May 24 to June i, 1892. The males are of a soft, light, brownish 

 colour, and possess remarkable genitalia. The pupa skins were usually 

 almost entirely extruded from the bag, showing that the pupa works itself 

 nearly out, only retaining its hold by fastening its extremity into the 

 silken lining of the bag near the lower orifice. The adult females may 

 or may not be fertilized in their bags. All the females I have observed 

 were found to have dropped from the bags to the earth of the cage. 

 Some were simply a skin stretched over a mass of eggs, indicating that 

 fertilization had been accomplished, while others showed no such 

 indication. Four females issued from their bags, as well as their pupa 

 skins, May 27 to 31, and were found upon the earth. The female is 

 almost entirely whitish, and grub-like in appearance except the head and 

 genitalia. There are some rings of brownish hair near the posterior 

 extremity of the body. June 9, on cutting open the remaining bags, a 

 live male pupa was found, several larvae, and an adult female. The latter 

 was dead and contained eggs apparently half formed, as though developed 

 to a certain stage but not fertilized. In one bag, with a dead larva, there 

 was found the puparium of a tachinid parasite with the contents dead 

 and more or less decomposed. 



Hemileuca juno^ Pack. 



On June 15, 1891, a number of large, spiny, warted bombycid larvae 

 were found on willow (Salix, sp.). They were nearly full grown. June 

 24 to 30, the same larva was found on cotton wood (Fopulus fretnontii). 



