190 



PSYCHE. 



IJanuary 1895. 



with a concentric grove; white, smooth, 

 stained bv the brown covering froth in ,in 

 angular marking, corresponding to the 

 edges of the individual bubbles. Shell 

 rather thick, opaque, pearly inside. Laid 

 close together on the rounded end in a 

 single Layered columnar mass forming a 

 band reaching half way round a twig or a 

 patch on the side of a larger stem near the 

 ground (Wiley). Froth rather light brown 

 with shining continuous surface. 



First stage. Head rounded, shining black ; 

 width 0.4 mm. Body black, not shining, 

 marked by a double row of minute orange 

 dots subdorsally. Hair nearly white, quite 

 thick, curving forward dorsally and back- 

 ward subventrally. A narrow subventral 

 li.ie and tips of abdominal feet pale. Later 

 the subdorsal orange patches become large, 

 distinct on joints 5 to 10. Each patch is 

 narrowed centrally at the large wart i and 

 is widest posteriorly \x\ the middle of which 

 is the small obscure wart ii. The warts 

 bear several hairs but are not well maiked. 



Second stage. Head black; bases of 

 antennae whitish; width 0.6-0.65 "if"- Bodv 

 black with a narrow, straight, reddisli 

 ad-dorsal line, slightly spreading at the 

 anterior and posterior edge of each segment, 

 absent at the extremities. A white sub- 

 ventral line and fainter substigmatal one. 

 Dorsal hair reddish, subventral hair paler. 

 Segmental incisures pale, giving a banded 

 appearance when the body is bent. There 

 are now some short hairs from the skin. 



Third stage. Black, hair abundant, 

 reddish dorsally, white subventrally. Width 

 of head 1.1-1.15 mm. Red ad-dorsal line 

 slight, rather broken; subventral pale line 

 quite distinct, substigmatal line faint, venter 

 grayish. No other marks at first, but later 

 a series of narrow, elliptical, dorsal blue 

 spots with pointed ends distinct onlv 

 centrally, closely bordered bv the pulveru- 

 lent, narrow, red ad-dorsal line. In the sub- 

 dorsal space traces of blue dots. The red 

 marks are much more reduced than in the 

 previous stage. 



Foiirtli stage. Head powdery blue, black 

 below, bases of antennae and line above the 

 mouth white; width 1.8-2.0 mm. Body black, 

 thickly covered with powdery blue up to and 

 enclosing the position of the subdorsal blue 

 dots, leaving a series of segmentary lateral 

 black patches. Dorsal space black, con- 

 taining a rather broad dorsal blue band, 

 broken at incisures and the single crinkled 

 and broken orange ad-dorsal line. Hair 

 red. thickest dorsally and subventrally and 

 paler subventrally. Joints 12 and 13 unorna- 

 mented, powdery blue. There is con- 

 siderable variation in the amount of blue 

 laterally. In some, the lateral black spots 

 form a continuous band, separating a blue 

 band corresponding to the dots; some have 

 this band broken into the ordinary spots and 

 only streaks of blue below and then the 

 orange is better developed, showing a little 

 of its subdorsal portion as well as the ad- 

 dorsal portion stronger than usual. The 

 dorsal line is continuous in a few, paler blue 

 than the lateral area. The other lines are 

 obsolete. 



Fifth stage. (Interpolated stage.*) Like 

 the last stage, but the blue a little less 

 whitish and not so confluent. Width of 

 head 2.2-2.4 "im- 



Fifth {or sixth) stage. Head powdery 

 blue with black dots; antennae whitish aj 

 base; line above mouth pale; palpi and 

 spinning organ pale, ringed with black; 



* Most of the larvae had but five stages ; but a 

 few less vigorous ones had six stages. It appears 

 from the widths of head that the larvae grow 

 regularly on the basis of five stages up to the st,-ige 

 IV. It is then a matter of degree of nutrition 

 whether tliey complete their growth in five stages or 

 in six. in the latter case interpolating an e.xtra stage 

 with an intermediate width of head. This is 

 probably true of all species of the genus and 

 explains the large measurement which I obtained 

 in the case of C. erosa {= disstria) in stage III 

 (Psyche, V, 364). The calculated series for C. 

 fragilh for the widths of head is .41, .69, 1.15, 

 1.92,(2.48), 3.2; ratios .60 and square root of 

 .60 = .774. 



