EnTOMOL O G ICA L CoNTRIB UTIONS. 1 1 5 



form an additional one, and the first liat> a depressed line pubdividing 

 it laterally. 



The larva from which the above description was drawn, was taken, 

 July 29th, feeding on the grape-vine. It had nearly matni-ed, mea- 

 suring two and one-half inches in length. 



On the 2d of August, the dorsal spots which were previously 

 yellow had changed to brown, and the lateral ones to a sordid 

 yellow. The larva having fully matured, endeavored to escape 

 from the jar to seek a place for its pupal change. 



August 4tli, the larva formed a little cavity on the surface of the 

 ground, and covered itself with some pieces of leaves loosely spun 

 together, intermingled with grains of earth. It transformed to a 

 pupa August 9th. 



Pu^a. — The pupa measured one inch and three-tenths long, by 

 35-lOOths of an inch broad ; color, dark brown ; head-case, as seen 

 from above, prominent, broad, rounded in front, with the eye-cases 

 projecting ; tongue-case buried, extending to the tips of the wings ; 

 autennse-cases, reaching to the end of the middle leg-cases ; dorsally, 

 the second segment is moderately wrinkled ; the third is narrowed 

 medially bv the convex maro'ins of the second and fourth segments : 

 caudal spine polished, skort, bifid, with a rugose, flattened, triangu- 

 lar base of twice the length of the spine. 



The imago from the above emerged on the 5th of April. 



The larva of T. Ahhotii is peculiarly interesting from the fact that its 

 two styles of ornamentation, in marked contrast one with the other, 

 indicate the sex of the insect, no other instance of which, among the 

 Lepidoptera, is known to us. The dorsal and lateral series of spots, 

 yellow as described above, but frequently and perhaps usually of a 

 pale green color, denote the male ; the female being brown, w^ithout 

 any trace of the above spots, but with interrupted, dark, subdorsal 

 and stigmatal bands and numerous small longitudinal patches.* 

 The following is a more particular description of it : 



Female larva. — Length, two and two-tenths inches ; diameter, 

 thirty -seven hundredths of an inch. Head semi-oval, shagreen ed, a 

 medial depressed line superiorly, two broad brown stripes in front, 

 bordered with paler brown, shading into darker brown behind the 

 eyes. Body cylindrical, with the three anterior segments tapering; 

 dorsally dark brown, shading to lighter on the sides ; the annulets 

 with large, subquadrangular spots of light brown ; third, fourth and 



*For an excellent representation of this sex see Han'is Ent. Corr., pi. iii, fig, 1. 



