18G5.] 187 



popnlioi Europe, which Dr. Clemens has, we consider wrongly, regarded 

 as its "representative." The structure of the caputal parts in their en- 

 tirety, in particular that of the palpi, offers distinctive features, and 

 the position of the head and the characters drawn from the secondaries 

 are sui-generis. C. juglandis is much slighter than *S'. populi, and its 

 slender, elongate, corporal parts, contribute to give it an unusually 

 strong Bombycid appearance, reminding one of Apatelodes and Para- 

 thi/rlx. The species wants the bright colored scale-patch at the base 

 of the secondaries, characteristic of 8. popuU. The ornamentation and 

 coloration are peculiar; the parallel, oblique, transverse lines are even, 

 not excavate or lunulate as in S. popxdi. 



Dr. Clemens remarks, concerning the larva, that it is " granulated 

 on transverse wrinkles, tapers anteriorly, the thoracic rings being 

 slender. The head is pyramidal and granulated, the vertex elevated 

 above the dorsum and bifid 5 caudal horn densely spined. The posi- 

 tion of the larva at rest is not sphinx-like; it is extended along the 

 midrib of a leaf, and when disturbed, throws its head from side to side, 

 making a crepitating noise." And of the pupa, that it " is rough, with 

 the terminal segments of abdomen flattened." 



A study of the species comprising this Tribe has satisfied us, that 

 its affinities are better served by according it a central position in the 

 family, the Bombycid characters of the species detracting nothing from 

 their Sphingid qualities. Amhnhj.r^'va. the preceding Tribe, has much 

 affinity, in both larval and imagiual states, with Smerhitlius, and the 

 Smcrintkid genus Golax. Htibner, shows very plainly affinities with the 

 Ohserocampini. A study of the figures of foreign Smerinthini, has 

 confirmed this reference. 



We name this hitherto undetected North American Sphingid genus 

 after Ezra T. Cresson, of Philadelphia, whose sterling merit as an En- 

 tomologist we acknowledge, and for whose kindness as a friend, we 

 have reasons to be grateful. 



»' 



Macrosila quinquemaculata. 



We have been unable to find any notice of this species by Haworth, 

 in any of the works of that author which have been accessible to us. 

 Mr. E. T. Cresson has likewise kindly assisted us in the research, and 

 with the same result. The first notice of the species under this name, 

 that we find, is by Stephens, in 1828, who calls the species " Sphinx 

 quinijuemaculatus Haw.," giving no reference or authority for the cita- 

 tion; hence the name maybe merely a MSS. one of Haworth. In the 

 latter view of the case, the name under which Hiibner fisiures it in the 



