•260 



PSYCHE. 



[July 1895. 



Effgs. The eggs are as usual in the genus. 

 The ring-like masses are large, quite prom 

 inent and well covered with the usual frothy 

 varnish. Thev appear to be deposited around 

 the smaller twigs. 



First stage. Entirely black with long pale 

 hairs, finely barbed. Under a half inch ob- 

 jective small luteous subdorsal patches ap- 

 pear on the posterior margin of each seg- 

 ment, except at the extremities. Head black, 

 not shining, width 0.4 mm. As the stage 

 advances, the subdorsal patches become more 

 distinct, especially on joints 5-10. They are 

 triangular in shape, the base directed pos- 

 teriorly. Subventral region pale. The 

 arrangement of the warts is shown in the 

 accompanying tigiu-e * magnified thirty-five 

 diameters. 



Second stage. Head dull black, width 

 about 0.6 mm. Body black, the subdorsal 

 orange patches as before or larger, but not 

 extending cephalad of the large black wart i. 

 Orange lateral and substigmatal lines now 

 appear and slight traces of a subventral line, 

 but all obscure and obsolete, at both extrem- 

 ities. The subdorsal patches vary in width 

 and may even reach the lateral line. Hairs 

 faintly reddish, a little paler subventially. 

 \Vart iv and the secondary one before the 

 spiracle conspicuous; secondary hairs also 

 present, but small. 



Third stage. Head round, black, not shin- 

 ing; width 1. 0-1.3 mm. Body black, marked 

 as before, but the orange marks are greatlv 

 extended, the subdorsal patches reach the 

 front part of the segment, or are divided into 

 two by wart i; lateral lines broadened and 

 diffused, so that most of the side is covered 

 by orange mottlings. A series of narrow, 



* In Journal N. Y. ent. soc. iii. 23, I described the setae 

 in stage i of the genus Clisiocampa, using my notes on 

 /riz^ilis. My description is quite erroneous, as the figure 

 shows, as my magnification was insufficient at that time. 

 My description should be replaced by the figure. It will 

 be noted that the arrangement beautifully corroborates the 

 points which I was trying to establish. The series of 

 hairs along the anterior edge of the abdominal segments 

 are secondary, and the primitive first stage is wanting. 



elliptical, segmentary, dorsal, blue patches. 

 Hail' )-eddish. 



Foiirt/i stage. Head round, black, hairyi 

 width 1. 6-1. 8 inin. The dorsal blue spots 

 form a broken line, on each side of which are 

 the two orange spots on each segment, the 

 posterior one large and irregtilarlv trian- 

 gular. A diffuse and mottled pale orange 

 lateral line and many irregular orange tnott- 

 lings, laterally and subventially. The sub- 

 dorsal blue dots now appear, but small, two 

 on each segment situated above the lateral 

 line. 



Fiftit stage. As in the next stage. Width 

 of head i.i-i.d mm. 



Sixth singe. Width of head 3.2mm. I 

 have already described this stage. (Can. 

 ent XXV, 42.) It will be noticed that the 

 evolution ot the markings of C pliii'ialis is 

 very direct. The original pattern is outlined 

 when the larva hatches and is merely in- 

 creased and supplemented by the small blue 

 marks as development proceeds. This is to 

 be contrasted with the evolution of fragilis 

 (Psvche vii, 189). C. fragilis starts with 

 the same pattern as pluvialis, but in the 

 third stage the course of development is 

 abruptly changed, the orange is reduced and 

 the supplementary blue marks afterward pre- 

 dominate. C. fliivialis seems to be the 

 most generalized of our Clisiocampa larvae 

 in respect to its markings. 



Cocoon and pupa as ustial in the genus. 

 The pupa is cylindrical, the thoiax and cases 

 small, the abdomen large centrally, the last 

 segment pointed, but blunt and without 

 cremaster. Color black, hardly shining, 

 covered sparsely with reddish pile except on 

 the cases. 



Food plants. Alder (Alnus), apple 

 and Crataegus a.nd also cherry, curiant, 

 bramble and rose, according to Stretch. 



The nests are not large, but compact. 

 One measured was 130 mm. long and 

 90 mm. broad at the top. 



