178 



PSYCHE. 



[November 1S91. 



transverse row of eight which each segment 

 bears; joint 13 has a double row. The tu- 

 bercles are not exactly in line, the two dorsal 

 ones being placed anteriorly to the others. 

 Faintly indicated geminate subdorsal and 

 lateral brown lines; thoracic feet dark; 

 length 12 mm. 



Fourth stage. Head mahogany red more 

 or less shaded with black ; furnished with 

 short hairs; jaws black. Body yellow, a 

 single dorsal and geminate subdorsal, and 

 lateral interrupted pale brown lines. Black 

 tubercles as in the previous stage, but more 

 elongated, the dorsal ones on the hump and 

 the subdorsal ones on joints 3 and 4 especially 

 so. There is also a slight hump on joint 12 

 with two elongated tubercles. Besides the 

 four tubercles on each side are two more 

 above the bases of the legs. The lines are 

 obsolete behind joint 11, and the arrange- 

 ment of the tubercles is confused. Cervical 

 shield elevated, bisected ; feet and anal plate 

 black. Venter pinkish. The anal pair of 

 feet are held elevated. 



As the stage advances the geminate brown 

 lines become filled in with white, and a nar- 

 row, interrupted brown line appears between 

 the dorsal and subdorsal lines and between 

 the subdorsal and lateral lines. The hump 

 on joint 5 has a decided rose tint. 



Fifth stage. As in the preceding stage, 

 but the black tubercles are still more pro- 

 longed, especially the subdorsal ones and 

 the dorsal on joint 5. The hump on joint 5 

 is rose color, that on joint 12 yellow; the 

 lines are black, except those that last ap- 

 peared, which are brown, the geminate ones 

 filled in with white, and all interrupted at 

 the humps and obsolete on joint 13. Anal 

 feet yellow, black at their bases. 



Food filatit. Maple {Acer). Larvae from 

 the Yosemite Valley, California, in August. 



I did not succeed in obtaining any moths 

 from these larvae, as the stage ride out of the 

 valley was more than they could endure ; but, 

 from a comparison with Mr. Edwards' de- 



scription, there is no doubt that they are O. 

 salicis. 



This species is the California representa- 

 tive of the Eastern O. concinna Sin. Abb., 

 but seems specifically distinct. 

 Heterocampa guttivitta Walker. 



1855. Cecrita guttivitta Walk., Cat. Brit, 

 mus., V, 992. 



1890. Cecrita guttivitta Packard, Proc. 

 Bost. soc. nat. hist., XXIV, 543. 



Larva. Closely allied to Heterocampa 

 biuudata Walk., which I have elsewhere de- 

 scribed.* Dr. Packard has described the 

 present species, but the larvae that I have 

 seen do not agree with his description. I 

 give the last two stages. 



Fourth stage. Head higher than wide, 

 conoidal in outline, flat in front; pale green- 

 ish, a curved band from the vertex to anten- 

 nae dark crimson, centered with and bor- 

 dered posteriorly by whitish. Labrum and 

 antennae yellow ; jaws red brown; width 2.1 

 mm. Body thickest at joint 8 when at rest; 

 feet normal, the anal pair elevated; on the 

 anterior edge of joint 2 is a yellow line con- 

 taining two brown points, which apparently 

 represent horns of a previous stage. (In H. 

 biundata the horns are present at this stage.) 

 A narrow white dorsal line, edged with black 

 on joints 2 and 3, obsolete on joint 13; a 

 yellow, subdorsal line fading out anteriorly 

 on joint 3, edged inwardly with dark brown 

 on joints 12 and 13, and with white outwardly 

 on the anal plate, narrowly and obliquely in- 

 terrupted on the anterior part of joint 11. 

 Between these two lines on each side is a 

 supplementary dorsal line, which starts from 

 the dorsal line on joint 5, and, running par- 

 allel to it, joins it again on joint 8, imme- 

 diately leaving it and running to the sub- 

 dorsal line which it joins on joint 11, just 

 posterior to the interruption. Faint traces ot 

 a yellow stigmatal line. The green of the 



* By error as H. subrotata Harv., Ent. amer., VI 



209. 



