REVISION OF THE OECOPHORIDAE — CLARKE 85 



area, but on genitalia characters they are identical, and for this 

 reason I do not feel justified in separating them specifically. The 

 larvae show a few differences in coloration, but larvae of this group 

 are likely to vary even though they may come from eggs of the same 

 female. No doubt the color variation existing between the two groups 

 of specimens is induced by differences in food plants. The habits of 

 the larvae are much the same, both forming rolls, but those on 

 Osmorhiza have an easier time of it because of the small size of the 

 leaves on which they work; those on Echinopanax have to cut the 

 leaf from the edge inwardly first and then form the roll. 



I am including a description of the lai-^'ae from both localities so 

 that their similarities and differences may be appreciated better. In 

 the main the larvae are the same. 



Dr. Braun has been kind enough to send me a specimen from Yellow- 

 stone National Park reared by her from Osmorhiza. It resembles the 

 Puget Sound series more closely than do the eastern Washington 

 specimens. 



The larva is as follows : Length, 15-16 mm. Head dull yellowish 

 brown, spotted with a darker brown posterolaterally ; from the base of 

 the antenna, extending in a line to the posterior edge of the head, is a 

 broad blackish-brown band constricted in the middle (in some speci- 

 mens the band is considerably broader than in others) ; ocelli light 

 brown. The margins of the underside of the head are blackish brown. 

 Cervical shield pale green, broadly edged laterally and posteriorly with 

 black and bisected with a fine whitish-green median line. Thoracic 

 and abdominal segments bright green heavily suffused with reddish 

 purple in the dorsal half when the larva is mature. Posteriorly on 

 the segments the reddish-purple color entirely obscures the green. In 

 the dorsal half there are three brownish-fuscous longitudinal stripes, 

 the outer ones fully twice as broad as the median one. On abdominal 

 segments 2-7 inclusive, near the dorsoanterior margin, on each side 

 of the dorsal stripe, is an outwardly oblique line of 4 to 6 small green 

 spots. Between the longitudinal lines are several small green spots 

 generally following folds in the skin. Anal plate green, heavily suf- 

 fused with reddish purple. Tubercles black centrally, whitish green 

 outwardly. Spiracles ringed with black, with a whitish-green suffu- 

 sion outwardly. Thoracic legs concoiorous with segments. 



Dr. A. F. Braun first discovered larvae of this species in Yellow- 

 stone National Park. She has sent me one bred specimen from this 

 lot of larvae. Although the food plant is widespread throughout the 

 inland empire, the larvae are very difficult to locate. Much time has 

 been spent in a search for these larvae in order to clear up the status 

 of this and related species. On July 13, 1935, a stand of Osmorhiza 

 was found at Godman Springs, Blue Mountains, Columbia County, 



