OF WASHINGTON, VOLUME XI, 1909. 163 



elongated ; in stage I bearing a few slender setae ; after the first molt, 

 the subdorsal and lateral rows covered with numerous urticating 

 spines, the subventral row rudimentary, represented by two \\ 

 setae. Of the subdorsal row, the "horns" on joints 3 to 5 and 11 to 13 

 are long, those on joints 6 and 10 rudimentary, the ones on joints 7 

 to 9 much shorter than the long ones and equal to each other. Of 

 the lateral row, the horn of joint 5 is absent, of 3 'much shortened, 

 while those of 4 to 11 are longer than the others. Depressed areas 

 very feebly developed as slight irregular pits, partially free from skin 

 spines; the dorsal row (1) paired, the subdorsal (2) smaller, scarcely 

 distinguishable; of the lateral rows, the lateral (4) is large, rcniform, 

 oblique, forming a distinct shallow pit, the lower intersegmental 

 lateral (6) very small and close to (4). In the contracted subventral 

 space the two large rows (7 and 8) are minute, but in a common 

 elliptical depression. 



At the last molt the length of the horns is considerably 

 reduced, while the coloration becomes fully developed. The 

 small, detachable skin-spines, or caltropes, occur in patches on 

 the lateral horns of joints 6 to 12 and on the subdorsal horn 

 of joint 13. No detachable spine patches are present. 



The larva falls in "Type 2" (Dyar & Morton, Journ. N. Y. 

 Ent. Soc., in, 146, 1895), but forms a separate section. The 

 "end-spines" being lacking, throws it with the generalized 

 forms of Euclea and with Adoneta, but the subdorsal horn of 

 joint 8 is not differentiated as in all these. In the horn- 

 structure it more nearly approaches Sibinc, in which, however, 

 the horn-formula is different, for the subdorsals of joints 6 to 

 10 are there uniformly suppressed, whereas in the present type 

 those of 6 and 10 only are suppressed, those of 7 to 9 being 

 fairly well developed. There is also a peculiar irregularity of 

 development of the long horns at the extremities. 



AFFINITIES, HABITS, ETC. 



The genus Cnidocampa, with its one species, flavescens, is a 

 somewhat isolated form of peculiar development. It appears 

 most nearly related to Miresa. In the adult of this genus the 

 antennse of the male are pectinated on the basal third, while 

 the larvae (of the two species known to me, albipuncta Herrich- 

 Schaeffer and argentifera AYalker i posses long end-horns, 

 short side-horns, the central subdorsals (joints 6 to 10) sup- 

 pressed, end-spines apparently undeveloped. Cnidocampa lias 

 lost the pectinations on the antennae of the adult, and is thus 

 a modified form of Miresa. The larva, however, is les^ 

 specialized than Miresa, having the subdorsal horns of joints 



