March 1S93.] 



PS T CHE. 



419 



ORGYIA BADIA, HY. EDW. AND OTHER NOTES, WITH A TABLE 

 TO SEPARATE THE LARVAE OF ORGYIA. 



BY HARRISON G. DYAR, BOSTON, MASS. 



Orgyia badia Hy. Edwards. 



1873, Hy. Edw., Proc. Cal. acad. sci., v, 

 188. 



1881, Hy. Edw., Papilio, i, 62. = antiqua. 



1883, Hy. Edw., Papilio, iii, 1S9. = anti- 

 qua. 



1887, Hy. Edw., Ent. amer., iii, 147, sp. 

 dist? 



1891, Smith, List lep., p. 27. = antiqua. 



Does Orgyia badia occur elsewhere than 

 on the Island of Vancouver, B. C? The 

 larvae found there by myself were quite con- 

 stant, and correspond exactly with Hy. Ed- 

 ward's original description. They differ 

 structurally from the larvae of O. antiqua 

 which were found right across the water at 

 Port Townsend, Wash., and in various places 

 in New England and northern New York. 

 But O. badia § <j? when brought to New York 

 and exposed there, attracted $ $ of O. an- 

 tiqua and hybridized with them. It would 

 seem as if O. badia was an isolated local race 

 cut off from communication with the parent 

 species by the water surrounding Vancouver 

 Island. If this view is correct, the name 

 should stand for the race. I append brief de- 

 scriptions of all the early stages of both O. 

 badia and O. antiqua for comparison. 

 Orgyia ANTiqyA race badia Hy. Edw. 

 Egg. — Spherical, a little elongate and 

 flattened on top; smooth, white, with a pale 

 brown spot and ring on top; diameter 1 mm. 

 Laid closely over the outside of the cocoon 

 of the $ moth without any covering what- 

 ever.* The eggs hatch the next spring. 



First stage. — Head rounded, shiny black; 

 width 0.55 mm. Body blackish, except the 



*Mr. Edwards says that the eggs are "surrounded by 

 hairs from the bodv of the mother," but this is not so. 

 The moth is not supplied with the necessary amount 

 of hair. 



dorsum of joints 3-4, 9-13, where it is largely 

 whitish, especially on the anterior patch. 

 Cervical shield black. The subdorsal warts 

 on joint 2 are large, all the warts black ; hairs 

 black, several from each wart. There are no 

 hair pencils, brush tufts nor retractile tuber- 

 cles. At the end of the stage a reddish spot 

 appears centrally on joints 9 and 10. 



Second stage. — As before, except that the 

 two retractile tubercles on joints 10 and 11 

 have appeared. They are orange red, as are 

 also the bases of the large hair bearing warts 

 on joint 2. There is a whitish lateral line 

 and the white patches on joints 9 and 13 are 

 orange tinted. Width of head 0.75 mm. 



Third stage. — Body black, abdominal 

 feet and venter pale. The dorsal patch on 

 joints 3 and 4 is divided by a black line, and 

 the lateral area is grayish. Subdorsally on 

 joint 2 is a pair, and dorsally on joint 12 a 

 single short, square, black pencil of plumed 

 hairs. On joints 5-8 are four bush-like tufts 

 of hair, growing from warts i and the upper 

 parts of ii; pale brown or black on joints 5 

 and 6, yellowish and smaller on joints 7 and 

 S. Warts iii-v whitish, the others blackish. 

 Head 1.1 mm. 



Fourth stage. — As in the third stage but 

 the warts are colored as in the next stage. 

 There are no traces of any lateral hair pencils 

 on joints 5 and 6. Hair pencils over 1 mm. 

 long; head 1.55mm. 



Fifth stage. — Head shiny black. Iabrum 

 paler; width 2.1 mm. Body dark gray, with 

 a dorsal black band, narrow anteriorly and 

 dividing a dorsal whitish patch, broad on 

 joints 5 to 8 and narrower on joints 9-13. 

 Venter pale as are the feet. On joint 9 dor- 

 sally, some orange streaks. Waits ii. iii pale 

 orange, v yellowish, vi largely black [i and 

 iv are so small as to be obscure]. Brus'h 



