January 1892.] 



psrciiR. 



203 



Later. 



"Fourteen butterflies emerged from 

 the chrysalids, but some of them did 

 not disclose the imago, but dried up in 

 the box, retaining their natural appear- 

 ance. I send these in a roll of paper." 



Explanation of Plate 4. 



Fig. 1. Spalgis s-signata Holland. 

 Chrysalis enlarged. 



Fig. 2. Same. Chrysalis, nat. size. 

 Fig. 3. Same. Larva. 

 Fig. 4. Same. Imago. 



LIFE HISTORY OF ORGYIA CANA HY. EDW. 



BV HARRISON G. DYAR. 



Orgyia caxa Hy. Edzv. 



1SS1. — H. Edwards, Papilio, v. 1, p. 62. 



Egg. Slightly conoidal though almost 

 spherical, smooth, shiny, opaque white, with 

 a faint brownish spot and ring at the flat- 

 tened end; diameter 1 mm. The eggs are 

 laid in a mass on the cocoon of the female 

 moth, fastened together by a slight amount 

 of froth and thickly covered with the faintly 

 brownish down from the body of the moth. 

 The winter is passed in this stage, the little 

 larvae hatching in the spring and emerging 

 as mature moths in July and August. There 

 is but one brood a year. 



First larval stage. Head shining black, 

 labrum a little paler; width 04 mm. Body 

 sordid purplish black, a dorsal yellowish 

 shade on joints 3. 4 and 9 and a whitish stig- 

 matal line. Warts black, the subdorsal ones 

 on joint 2, large; hair thin, but several hairs 

 grow from each wart, black. There are no 

 brush-like tufts, hair pencils nor retractile 

 tubercles, but the places of the latter are in- 

 dicated by a dorsal red spot on joints 10 and 

 11 respectively, not elevated. 



Second stage. Head brownish black, 

 shiny ; width 0.7 mm. Body and warts black, 

 hair thin, bristly and black. The subdorsal 

 warts on joint 2 are large, but there are no 

 brush tufts nor pencils. The retractile tub- 

 ercles are present on joints 10 and 11, small, 

 and colored dull blood red. The dorsum is 

 paler on joints 3. 4 and 9. 



Third stage. Head black with a brownish 

 tinge, labrum white; width 1.1-1.3 mm. 

 Body black except on the dorsum of joints 3 

 and 4 where it is yellowish white with a 

 black dorsal line, and also a yellowish sub- 

 dorsal spot on joints 9 and 10 (anteriorly). 

 Warts all black; hair long, black with pen- 

 cils of short, plumed, black hairs from the 

 subdorsal warts of joint 2 (none on joint 12). 

 There are small, dorsal, black, brush-like 

 tufts on joints 5 and 6 and a few short tufted 

 white hairs on joints 7 and S. The warts of 

 row 2 on joint 9 are a little tinged with 

 red. Retractile tubercles red. Length of 

 larva about 9 mm. 



Fourth stage. Head brownish black, la- 

 brum and antennae sordid white; width 1.7- 

 1.8 mm. Body greenish black below, gray 

 on the sides, a black subdorsal and yellow 

 subventral line. Dorsum largely sordid j'el- 

 low; cervical shield, a dorsal line on joints 

 3 and 4, a shade surrounding the tufts on 

 joints 5-8, and a broad band from joint 9 

 posteriorly to joint 12, all black; joint 13 

 dark gray. The warts of rows 1-5 and the 

 retractile tubercles are all blood red, concol- 

 orous, except those on joint 2 which are 

 black. The plumed pencils on joint 2 are 

 2.5 mm. long, and there is now also one on 

 joint 12 dorsally. The brush-like tufts on 

 joints 5 and 6 are brown, those on 7 and 8 

 white. The other hair is long and black but 

 whitish subventrally. 



