THE CANADIAN ENTOMOLOGIST. 75 



Var. B. — General color with a stronger tinge of green, and an indistinct 

 pale irregular stripe on each side (this character is also faintly visible in 

 specimens of Var. A) ; whitish patches on fifth and sixth segments faint ; 

 small tubercles same as in Var. A. 



Var. C. — Much paler in color than either of the other varieties, with 

 the body of a decidely greenish tint. Dorsal stripe very faint; light 

 patches on fifth and sixth segments scarcely visible ; small tubercles on 

 each side the dorsal line blackish or brownish black, and in consequence 

 of the paleness of general color, appear more prominent ; dark patch on 

 fifth segment wanting, that on ninth and -tenth segments present, but 

 rather paler than in the other varieties ; lateral fringe very pale, with a 

 slight pinkish tint. Spiracles dark, faintly encircled with whitish. 



In all these varieties the markings on the head are constant in the two 

 species ; the peculiar shaped patches on fifth and sixth segments in 

 polygama are constant, but vary in distinctness. The small dorsal 

 tubercles in cratcegi are always more or less red, but the most prominent 

 and valuable point of distinction is to be found on the ninth segment, 

 which in polygama is never more than a slightly raised fold, while in 

 crata>%i it is invariably a distinct thick fleshy horn, about uniform in size.' 

 This one character will enable any collector instantly to separate the larvae 

 of the two species. 



NOTES ON LEPIDOPTERA. 



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



Thyreus Abbottii. Larva. 



The larva of Thyreus Abbottii possesses a peculiar interest to the 

 Entomologist, as it is the only species of which the sex is supposed to be 

 indicated by the coloration. Frequent reference to this is found in works 

 of different authors, and nowhere have I seen any doubt expressed about 

 the validity of the distinguishing markings between £ and <f (vide 

 Harris' Ent. Correspondence, p. 284 ; N. Y. State Museum Report, p. 

 114; Can. Entomologist, 1874, p. 146). 



