July— Auj,nist iSSS.] 



PSYCHE. 



85 



more frequent in southern than in 

 northern parts, a second or su^^plement- 

 ary brood is formed in one season ; as 

 the butterfly lays eggs for some time, 

 and all the females are not born at once, 

 the eailiest progeny of the earliest 

 females may not infrequently be able to 

 mature in the same season in time for 

 the production of a second brood. This 

 would seem to be a provision on the 

 part of nature to give the species a 

 better chance. That they need it is 

 perhaps evidenced by the fact that the 

 black-veined orange species, which are 

 almost universally more numerous in 

 individuals than the otiiers, have, in 

 regions where one brood is the normal 

 condition of their fellows, always two 

 broods. 



But this is not the only advantage the 

 black-veined orange species have, so 

 that we cannot fairly ascribe their 

 greater numbers to this alone. Their 

 very colors are an advantage to them, 



for in them they mimic species of E71- 

 plocinac, which possess a taste antl 

 perhaps an odor offensive to birds and 

 other insectivorous animals ; the mimi- 

 cry is very striking indeed, and is the 

 more remarkable from the fact that the 

 northern species resembles the only 

 species of Eitploeinac found in the 

 region it inhabits, while the soutliern 

 species as well as the southernmost 

 examples of the northern species, re- 

 semble another which is more common 

 in the region they inhabit. 



It is indeed possible that one of the 

 normally colored species of Basilar- 

 chla., one that has least conspicuously 

 contrasted colors, though resplendent 

 with blue and green, is specially pro- 

 tected by the various other devices we 

 have recounted ; for certainly ii is itself 

 mimicked by one sex of a butterfly of 

 another very distinct group, viz : Sem- 

 nopsyche diana. 



DESCRIPTION OF THE LARVA OF SPHINX LUSCITIOSA. 



BY CAROLINE G. SOUI.E, BROOKLINE, MASS. 



This larva was found on a poplar 

 shoot, at Sugar Hill, N. H., 21 July 

 1887. 



It was then 18.5 mm. long, slender, 

 and green. The head was triangular, 

 pale green, with a pale yellow stripe 

 on each side. The body was brighter 

 green, covered with white granulations, 

 these being less numerous ventrally. 



There were seven oblique lines of 

 pale yellow, edged above with green 



darker than the body, and the last one 

 extended to the tip of the caudal horn. 

 A clear yellow horizontal line on the 

 first three segments, was continued 

 very faintly to the last segment. 



The anal shield was of a bluer green 

 than the body, and edged with white. 



The feet and props were green ; the 

 caudal horn was pinkish above, green 

 beneath, and lined on each side with 

 yellow. Spiracles almost invisible. 



