114 Twiurrr-rouRTa REPORT ON THE STATE MVSEVX. 



III. ON THE LARVA AND PUPA OF THYREUS ABBOTII SWAISSOS. 



Male larva. Head large, of the diameter of the first segment, 

 subquadrate, shagreened, two broad stripes of brown on the front, 

 behind which is a subtriangular whitish patch, occupying all the 

 lateral portion except a small patch of brown posteriorly ; the clypeus 

 half as long as the head. Collar pale yellow, divided on 'each side 

 by a narrow dark brown line, which is continued over the fol- 

 lowing segment. Body reddish -brown, with numerous longitudinal 

 linings in darker brown ; dorsally and extending half-way down the 

 sides is a series of nine sharply defined, bright yellow spots, which 

 commence on the second annulet of a segment and extend backward 

 to the incisure (leaving intermediate transverse reddish-brown bands 

 of a single annulet), and are convex on their sides ; the first spot on 

 the second segment is triangular, the second is suboval, and the 

 others of a uniform outline ; on the sides is a stigmatal series of yel- 

 low spots, one to each segment, of which the first three and the last 

 three are confluent ; the six intermediate ones are of a uniform sub- 

 triangular outline, the last four of which have their lower rounded 

 angle reaching downward on the base of the prolegs, their anterior 

 angle in range with the front margin of the dorsal spot and touching 

 the inferior portion of the stigma, and their posterior angle resting 

 in an ovoid outline on the first annulet of the following segment, or 

 impinging in a point on the second annulet at a height of the superior 

 portion of the stigma. On the eleventh segment is a hump, encircled 

 at the base with a delicate black ring, and surmounted by a vitreousoval 

 tubercle of a fuscous color inclosed by a whitish line, which line is 

 reflected and continued in a circumscribing circle embracing a black 

 curved spot on the front and sides of the oval tubercle. From the 

 base of the tubercle backward to the incisure and ranging laterally 

 with the adjacent dorsal spot is a yellow supra-anal spot. The 

 subcordate anal shield is of a yellow less bright than the spots. 

 The legs are pale red ; the prolegs are marked exteriorly with a nar- 

 row quadrilateral black spot surrounded with a whitish shade. The 

 ventral region is red, with two rows of pale yellow spots. 



The segmental annulets of this larva differ somewhat from those of 

 the Sphinx proper, in that the eighth is subdivided so as almost to 



