410 [NoVEAIliER 



not commencing quite so abruptly near their basal portion, and in the 

 general color being grass-green instead of cinereous-brown. After I 

 had recognized the above as a distinct species, I received from my or- 

 nithological friend, Dr. Velie of Rock Island, single specimens of both 

 sexes, captured by himself in a place overgi-own by weeds, but with no 

 trees within a long distance of it, on the North bank of the Platte 

 River, in Nebraska The 9 agrees in every respect with mine; the S 

 differs from the % of J'emorata, 1st, in the general color being much 

 more green, 2nd in the anterior femora being rather less incrassated, 

 3rd in the middle femora not being trifasciate with brown, 4th in the 

 supra-anal plate terminating in two acutely angular, horizontally flat- 

 tened teeth, instead of being rounded at tip, 5th in the interior base of the 

 caudal appendage being furnished with an acute thorn, directed back- 

 wards and nearly as long as the appendage is wide, instead of a large, 

 vertically flattened, rounded lamina directed backwards. In all other 

 respects both sexes agree with /cmorata, but the marked difference in 

 the caudal appendages % 9 would alone be sufficient to separate them 

 as distinct. I propose for this species the name of Dlapheromcra Vclii. 

 Although there is no positive proof that it is a Phytophagic Species, 

 yet as femorata ordinarily occurs upon forest trees, (oak, basswood, 

 &c.,) and never, so far as I have observed — and I have probably had a 

 thousand specimens pass through my hands — in localities where there 

 are no trees, I incline to believe that it is. 



It is not necessary, however, that in every case Phytophagic Species 

 should take their origin from Phytophagic Varieties, using the term 

 "variety" in the sense ordinarily given to it by entomological Sys- 

 tematists. It sometimes happens that what is to all external ap- 

 pearance one homogeneous species is composed of two or more dis- 

 tinct races, feeding each upon a distinct plant, but not distinguisha- 

 ble, either in the imago or so far as known in the larva state, by any 

 external characters whatever, whether colorational or structural. We 

 meet apparently with a case of this kind in C^nipa q. spang ifica 0. S. 

 and C. q. i)ianis 0. S., the former of which forms a gall on the Black 

 Oak and the latter a very different gall on the Red Oak. the imagos % 

 9 , with the exception of the dimorphous 9 form of the latter which is 

 unknown, being to all appearance identical. I inclined to the opinion 

 at one time that these two forms were identical, the difference in the 



