-t-2 [November 



the 9 antennfe are exactly alike, being in both races a little more than 

 2 as long as the body, with the terminal joint equal in length to the 

 penultimate or perhaps very slightly longer, and no perceptible differ- 

 ence in the robustness of the whole antenna. The general appearance 

 of the two $ 9 and of the S of the locust-feeding race is very similar, 

 but, owing to the shape of the elytra, the % of the hickory-feeding race 

 has a different and Lepfura-Wke habit. So closely indeed does the % 

 of the l(jeust-feeding race resemble the 9 of both races, that until a 

 recent period I had always supposed, that all my specimens of that 

 race — some 30 or 40 in number^were 9 9 , and that the unique 

 % which I possessed of the hickory-feeding race was the normal % 

 of the species. In all the 9 9 of both races the W-shaped band 

 on the elytra is as yellow as the other bands. Whether there is any 

 distinction in the larva state is unknown, as the larva of the locust- 

 feeding form has never yet been critically examined. Here again, 

 as in the two Ilaksidofa, we find the colorational pattern of the 

 imagos so complicated and diversified, that it is impossible to believe 

 that the two forms have no genetic connection, for the same reasons 

 referred to in the case of the Halesidota. That they cannot be mere 

 Phytophagic Varieties, has, I think, been most clearly demonstrated 

 in the paper already quoted. 



Whether we choose to consider the locust-feeding and the hickory- 

 feeding forms of this insect as Phytophagic Species, or as distinct spe- 

 cies in the sense given to that term by the believers in the Creative 

 Theory, it will be obviously both convenient and necessary to have a 

 separate name for each. It is a doubtful and disputed question in 

 Entomological Archaeology, whether Drury's name picfiis or Forster's 

 name rohinlx has the priority, as Drury was the first to describe the 

 insect and Forster the first to name it. We may therefore, with even- 

 handed justice, appropriate the name of robiniee to the locust- feeding 

 race with short and slender S antennaj and legs which appears in Sep- 

 tember, and the name of picfus to the hickory-feeding race with long and 

 robust % antennee and legs which appears in May and June. 



Sphingicampa distigma Walsh and Dryocampa bicolor Harris 

 (pp. 290 — 294). I have shown here, though there is a certain degree 

 of doubt attaching to the proof, that the S of the former of these two 

 species is undistinguishable from the % of the latter, the 9 of which is 



