6 



Tliis genus is very clearly clcfuied ; the small hairy eyes separate 

 it at once from allied genera ; it is probably closest to Lasiocampa but 

 the eyes are smaller and veins AL and M^ of secondaries are well 

 stalked, not connate, a distinction that has held good in over fifty 

 specimens of both sexes and several species. The relative positions 

 of veins R^, R. and M, of primaries seem variable; they may be all 

 practically from a point at end of cell, but most often R5 and M, are 

 slightly stalked and R^ slightly behind the apex of cell. Of the early 

 stages and habits of the various species included in the genus practi- 

 cally nothing is known. A correspondent in Arizona tells us the S of 

 gargamcllc flies from 3 p. m. until dusk, a fact that probably is true 

 for the other members of the group. The 5 is attracted by light quite 

 readily. 



G. ARizoNENSLS Pack. (Plate II, figs. 1-3, 6.) 



G. ariaonciisis Packard, Rep. Peab. Acad. IV. 90 (1872); Strecker, Lep Rhop. 

 and Het. 136, PI. XV, fig. 6 (1878) ; H. Edwards, Papilio I, 100 (1881) ; 

 1. c. IV, 105 (1884); Neum. and Dyar, Jour. N. Y. Ent. Soc. II, 159 

 (1894); Barnes. Can. Ent. XXXI, 48 (1899) (desc. of S). 



D. dolorcs Neum. and Dyar, Ent. News, IV, 248 (1893) ; Ent. News, III, PI. VI„ 

 fig. I (1892) (non arizonensis) ; Neum. and Dyar, Jour. N. Y. Ent. 

 Soc. II, 159 (1894) ; Dyar, Jour. N. Y. Ent. Soc. IV, 23 (1896). 



The species occurs in two forms which have been described as 

 separate species, but taking into consideration the well-known ten- 

 dency to variation of the Lasiocampids we are of the opinion that but 

 one species is represented. 



Typical arizonensis was described from a single 9 from Arizona, 

 in which the submarginal line is very regular and sharply dentate, as 

 figured by Strecker. The male described by Edwards as belonging 

 to this species proved to be gargamcllc; the correct male was described 

 in Can. Ent. 31, p. 48, by Dr. Barnes. Dolorcs was separated by Neu- 

 moegen and Dyar on the strength of a single female specimen from 

 Arizona in which the subterminal line is more irregular and undulate, 

 rather than dentate. We have before us a series of I 5,892 from 

 Glcnwood Springs, Colo., all of which are fairly typical arizonensis ; 

 a single 9 from Colorado (Bruce) would come under dolorcs, and a 

 further series of i 5,899 from Arizona are mostly dolorcs, but 

 several 9 9 show a marked transition to arizonensis. In their revis- 

 ion of the Bombycids Neumoegcn and Dyar separate the two forms 



