184 ZYG^NIDiE AND BOMBYCIDjE 



with a slender tibial spur from the middle ; hind tibiae with two min- 

 ute apical spurs." 



Clemens, Proc. Acad. Nat. Sci. Phil. i860. 

 This genus differs from Harrisina [q. v.] in the different form of 

 the primaries, which are proportionally shorter, having a more con- 

 vex costa and a different neuration ; also in the form of the secondaries 

 which nearly equal the primaries in length and are quite equal to them 

 in breadth ; in the length of the abdomen, which reaches about to the 

 end of the hind wings ; and also in the antennae which have much 

 shorter and coarser pectinations. The style of coloration is similar, 

 being black with a bright colored prothorax, and is much nearer Pro- 

 cf'ts of Europe than is Harrisina. The only known spectes is much 

 smaller than any of its allies. Dr. A. S. Packard, jun., included it in 

 his genus Harrisitia, as we think erroneously. 



l.-ACOLOITHUS FALSARIUS. (Pi. 7, fig. .) 



Acoloithus falsarius, Clems., Proc. Acad. Nat. Sci. Phil., p. 540. 



[i860.] 

 Procris /aharius, Morris, Syn. Lep. N. Am., p. 134. [1862.] 

 Acoloithtis falsarius, Clems., Syn. Lep. N. Am. App., p. 283. 



[1862.] 

 Harrisina Sanborni, Packard, Proc. Essex Inst. [1864.] 



5 .— ? . Entire insect deep blue black, with the prothorax orange, 

 hind wings rather thin. 



Expanse of ivings, 0.60 inch ; length of body, o 20 inch. 



Habitat. — Texas [Belfrage]. Pennsylvania [Clemens]. Illinois 

 [Kennicott]. Missouri [Riley]. 



The insect figured was received from Mr. Belfrage, of Texas. 

 Though so closely allied in color to the various species of Harrisina, 

 it may readily be separated by the generic characters. 



