The Males of Hemar'me awl other Sphinges. 691 



ill length, tlie ridge running back dorsally does not appear 

 to carry any spines. 



Acosmeryx cinerea. — The parts are ahnost quite sym- 

 metrical. The opening of the ledceagtis is terminal, and the 

 right side seems rather more solid and armed by fine teeth, 

 not clearly seen on other side. 



Sphinx 2)inasfri. — The mdcvagics here is extremely long 

 and slender, and terminates by slightly curving to the left. 

 The right side is produced into a long process, of which 

 about 1 m.m. is free, and nearly twice such a length runs 

 back along the tube as a dark chitinous thickening. The 

 tube is rather swollen along this portion. Apparently from 

 the opposite side of the opening, but really, I believe, as 

 part of the eversible membrane, that happens to be here 

 displayed are two shorter more delicate processes that are 

 placed against this longer process, one on either side of it. 

 These two are not quite identical. 



Ag. convolvuli. — The asymmetry, if present, is inappre- 

 ciable. 



M. tilicV. — No asymmetry detected. 



M. atropos. — Apparently quite symmetrical. 



Sphinx lig^tstri. — There is practically no asymmetry. 

 The prolonged triangular apex appears to be dorsal and 

 without dift'erentiation on its two margins. 



Amhulyx rostralis. — The asymmetry here is reduced to a 

 slight appearance, of the aidoiagiis being rotated a little, 

 and some doubtful microscopic details. It is difficult to 

 . say positively that there is or is not asymmetry. 



Amorpha ]Jopuli. — The asymmetry here affects certain 

 rather numerous very long thick spines on the eversible 

 membrane at the opening of the mdceagus, these are more 

 numerous, stronger, and distributed more distally on the 

 left than on the right side. 



Smcrinthus ocellatus. — The eversible membrane here is 

 armed with numerous spines as in Sm. pojyidi, they are 

 smaller and more curved than in populi. Their asym- 

 metrical arrangement is quite subsidiary to the very 

 marked structure of the termination of the aidteagus, which 

 has an extraordinarily strong thick process on the left side, 

 directed outwards, and ending in a rather sharp spine, 

 curved so that the point is directed dorsally. The opening 

 is thus thrown over to the left side. 



This paper ought to include a reference to some facts 

 recorded by Professor Poulton, as to asymmetry in the 



