THK CANADIAN ENTOMOLOGIST. 401 



detailed description has yet been published. In the fall of 1909 we 

 received From Ft. Wingate, N. M., a number of pupae of this species, 

 vvhiph began to emerge about the middle of April, 1910. The time of 

 emergence is usually towards noon, and in the early afternoon the males 

 commence their flight. Our first attempts to secure a pairing were futile, 

 but on experimenting further it was found that freshly- emerged males 

 copulated very readily with females that had emerged the previous day. 

 From two such pairings a large number of ova were secured, oviposition 

 lasting over a period of a week, and being in each case practically com- 

 plete ; the number of ova laid by a single female is in the neighbourhood 

 of 300. The duration of the egg stage is about two weeks, the young 

 hrvae on hatching feeding readily on oak and reaching maturity in from 

 four to five weeks. Pupation takes place, as in all the members of this 

 group, in the ground. A very small proportion of the brood emerged 

 after a short pupal duration of about three weeks, these being all females ; 

 the remainder are at the time of writing still pupae, and will probably 

 hibernate as such. Whether in their natural condition there" are normally 

 two broods we do not know, but consider it very probable from the fact 

 that Biederman mentions obtaining ova the latter part of August. Following 

 is a more detailed account of the various stages : 



Ova. — Smooth, flatly elliptical, pale yellow ; dimensions, 2 mm. x 

 1.7 mm. X 1.2 mm. 



Stage I. — Head oval, with a few short setae; width, .8 mm. Body on 

 first hatching yellowish, later greenish-gray, .with smooth skin and black 

 primary tubercles. The prothorax contains a narrow cervical plate of a 

 slightly darker colour than the surrounding area, on the anterior margin of 

 which are placed four small rounded black tubercles, each with two setse. 

 On mesothorax tubercles i and ii appear to have united to form a spine .8 

 mm. long, from the apex of which two fine setee arise ; on metathorax the 

 position of tubercles i and ii is occupied by a small conical tubercle 

 with two setae. Tubercle iii on both segments also possesses two setae, 

 whereas iv shows but one. On the abdominal segments, witii the excep- 

 tion of the 9th, both tubercles i and ii are present, i being much the larger; 

 each has but one seta. Tubercle iii arises from the anterior margin of 

 the segment directly above spiracle, whilst iv is well below lateral fold of 

 skin, and rather minute. On the thoracic and first two abdominal 

 segments there is also a fifth small tubercle, placed rather ventrally. The 

 9th abdominal segment contains dorsally but one tubercle placed in the 

 central line, and rather larger than the preceding ones. Laterally the 



