THE CANADIAN ENTOMOLOGIST. 189 



entirely to light geenish-white, with slight traces of the old dark stripe 

 remaining along its edges ; sublateral white stripe narrow and distinct ; 

 stigmatal stripe nearly black and irregular in width, being narrowed 

 between segments and broadened around stigmata ; substigmatal stripe 

 white, below this there is still another dark stripe which is interrupted 

 between the segments ; anal plate light coloured and set with numerous 

 spines. Tubercles and spines upon body as in previous stages, but less 

 conspicuous on account of darker colour of body ; each tubercle 

 terminated by a shining black ring around base of spine borne thereon ; 

 each stigma marked by a shining black, oval border, enclosing white area 

 in centre. 



Venter light green ; thoracic legs somewhat yellowish, claws 

 brownish ; prolegs concolorous with venter or with slightly yellowish 

 tinge ; prolegs upon fifth abdominal segment vestigial in all stages, 

 crotchets upon them arranged around end of leg in the form of a horse- 

 shoe opening outwardly (Fig. 4) ; of the eight or nine little crotchets on 

 each vestigial proleg, the three posterior ones are largest ; each proleg 

 of the two functional pairs bears crotchets arranged in two groups of 

 from 7 to 9 each at the extremities of a crescentic or semicircular pad 

 borne upon inner side of tip of proleg, with it's convex edge inward (Fig. 

 5). The crotchets vary in length alternately, thus forming two rows of 

 hooks ; along the convex edge of pad between the two groups are 

 vestiges of from 8 to 14 more crotchets. (Plate 4, Fig. 6.) 



Moulting. — As the larva approached a moult, it ceased to feed 

 became quiet for a time, which was longest before the third moult, last- 

 ing then for nearly two days, and when fully ready to shed its skin, firmly 

 attached its prolegs, let go with its thoracic legs, and stood out at an 

 angle to its support. Successive contractions now took place in various 

 parts of the body, the thoracic legs were withdrawn and the skin 

 stretched backward, after which the skin began to rupture on the ventral 

 side of the throat, and through this transverse opening the under side 

 of the prothorax appeared, the rupture continuing around the throat thus 

 severed the old head-covering entirely from the rest of the integument. 

 The thorax was soon freed, and by successive expansions and contrac- 

 tions of the body running backward with a wavelike motion the skin was 

 drawn back over most of the abdominal segments. When about half the 

 length of the body had been thus freed, the old head integument, which 

 had in the meantime remained attached to the head over the mouth-parts, 



