204 THE CANADIAN ENTOMOLOGIST. 



above, yellowish subventrally, with a faint geminate yellowish dorsal line. 

 The conical spined tubercles of rows (i)-(3) are black, rows (4)-(6) 

 straw-yellow, spiracles black ; thoracic feet black, abdominal pale. As 

 the stage advances subdorsal, stigmatal and substigmatal lines appear, not 

 very distinct, and formed of yellowish mottlings on the black ground 

 colour. 



Chrysalis. — Of usual shape, thorax not carinated but with three 

 blunt points, the anterior part rounded ; cases moderately prominent ; a 

 depression between thorax and abdomen. Abdomen straight along the 

 ventral side, curved dorsally, with five rows of short, blunt points, cre- 

 master flattened, rather long, colour nearly uniform, dull wood-brown from 

 black mottlings on a reddish-brown ground colour, the dorsal tubercles 

 reddish. A row of minute white dots on antennas cases and around 

 borders of wing. Length, 12 mm.; width, 4 mm. 



Food Plant. — Thistle ( Cardmis). 



Ckrysophanus arota, Boisd. 



Larva. — Elongate elliptical, flat below, the feet all short ; sides slo. 

 ping ; dorsum forming a narrow flattened ridge, slightly wider on joints 

 3 and 4 ; body highest at joint 5 and tapering to the extremities. Head 

 retracted under joint 2, pale testaceous, the mouth parts surrounded with 

 brown ; width in the last stage, i mm. Body minutely pilose, with very 

 small white granulations, or subdorsal white line along the ridge inter- 

 rupted at the segmental sutures (which are deep), beginning on joint 3, 

 most distinct on joints 3 and 4, somewhat fainter centrally, and somewhat 

 more continuous posteriorly. A similar fainter line on the subventral 

 ridge, becoming obsolete at the extremities. Both lines look as if not quite 

 on the surface. Spiracles small, circular, yellowish. Cervical shield in 

 the middle of joint 2, very small, triangular, depressed. Length, 17 mm.; 

 width, 5 mm. 



Chrysalis. — Robust, short, rounded ; depression between the thorax 

 and abdomen small ; abdominal segments appressed, motionless. General 

 colour sordid green, most distinct on the abdomen dorsally ; thorax with 

 a few black specks and a smoky black dorsal line which is continued in a 

 row of dots on the abdomen. Each side of this, on the central part of 

 the thorax, is a white streak, supplemented on the posterior part by a 

 short white curved line. On the abdomen, a subdorsal row of blackish 



