14 HARRISON G. DYAR 



As compared with its nearest ally, Adoneta spinuloides H. S., 

 the larva of A. bicaudata is narrower, less elevated at joint 5; the 

 horns of joint 13 are long, predominant over those of joint 12, which 

 exceed those of joint 10; the widenings of the dorsal purple band 

 are all subequal, five widenings, each practically alike, no pushing 

 out of the subdorsal horns of joints 6 and 7; caltropes reduced 

 on the anterior side horns, joint 6, et seq., only well developed on 

 joints 2 and 13; the color of the dorsal band is bluer purple than 

 spinuloides, less reddish or maroon. 



DESCRIPTION OF THE SEVERAL STAGES. 



Egg. Elliptical, colorless, shining, flat, the surface faintly retic- 

 ular. The yolk forms a slightly opaque central mass, leaving a 

 transparent rim. On the leaf the eggs are shining and transparent, 

 resembling drops of moisture. Their extreme flatness enables 

 them to be laid overlapping like shingles. Size, 1.4X0.8X0.1 mm. 

 The development of the embryo can be easily observed in eggs 

 laid on glass. The shell is thin and transparent, merely a delicate 

 skin. It is impossible to detach the eggs without destroying them. 

 They hatch in 10 days. 



Stage I. Elliptical, the dorsum flattened, the sides oblique, 

 the venter flat. Head small and weak, without hard chitinous 

 covering; mandibles and palpi present, but reduced and weak; 

 the mandibles with four equal blunt teeth incapable of feeding, 

 colorless. A subdorsal and a lateral row of processes or " horns, " 

 one on a segment, the subdorsals on joints 3-13, the laterals on 

 joints 3, 4, and 6-12. The subdorsals of joints 3, 4, 5, 8, n, 12, 

 and 13 are large, the others small; the laterals of joints 3 and 4 

 are large, the others smaller, but not as small as the small subdorsals. 

 Each horn bears three setae, occasionally but two, slender, slightly 

 clavate-tipped, smooth. The setae of joint 2 are not elevated on 

 horns. Skin smooth. Colorless, whitish, without markings. On 

 hatching, the larvae gathered in groups as they had been laid, 

 and molted in two days. Length, o . 9 mm. 



Stage II. Head rounded, white, clypeus highly triangular, 

 reaching about half-way to the vertex; eyes black; mandibles 

 stout, brown-tipped. Elliptical, narrowed behind, dorsum nearly 



