OF NORTH AMERICA. 119 



Prothorax black, ------ H. coracina. 



Prothorax red-orange. - - - - - H. lexana. 



"Under this name," says Dr. A. S. Packard, jun. ,* "may be 

 placed the Procris Americana of Dr. Harris, Aglaope Coracina, Clemens, 

 and another undescribed form from the Middle States, communicated 

 by Mr. F. G. Sanborn. Without attempting to improve upon Dr. 

 Clemens' excellent description of this genus, we would merely point 

 out some marked differences from Procris, Fabr. , and Aglaope, Latr. 

 From the latter genus Harris states that the Americana differs entirely. 

 With Fuessly's figure of Latreille's itifausla from Southern Europe 

 before us, which has broad wings and bright colors, and differs 

 throughout, we are convinced of BoisduvaFs mistake in referring our 

 species to it."' 



" However it differs nearly as much from Procris Viiis and allies of 

 Europe. The wings are a third longer and much narrower, the apex 

 is much more rounded and the outer margin much more oblique. 

 One of the best distinctions lies in the very ovate secondaries oi Amer- 

 icana, owing to the convex outer edge, which in Procris and Ino as 

 well as ZygcEna, is angulated in the middle, thus giving the wing in 

 those genera a squarish appearance. The nervules are longer and 

 more parallel with the costa. When expanded the secondaries only 

 reach to the basal third of the abdomen, while in Procris they reach 

 to the basal two-thirds. The abdomen is remarkably square, a little 

 flattened and slightly spreading in the female of Harrisina, in Procris 

 it tapers gradually to an obtuse point.'' 



In thus separating these insects under a new generic name Dr. 

 Packard is undoubtedly right, but the new species {H. Sanborni) de- 

 scribed in the same paper belongs to Dr. Clemens' genus Acoloithtis, 

 and according to Mess. Grote and Robinson^.4. falsarius, Clemens. 

 In their Catalogue of the Lep. N. Am. Messrs. Grote and Robinson 

 place Americana and Coracina under the genus Acoloilhus, Clemens, 

 whicTi can scarcely be right, as the two genera, as described by Dr. 

 Clemens, differ very widely, not merely in the relative proportions of 

 the wings and abdomen, but also in the neuration and structure of the 

 antennae. 



From a careful comparison of insects referable both to Acoloithus, 

 Clemens, and Harrisina, Packard, I am led to the conclusion that 



* Proc. Essex Institute, April, 1864. 



