THE CANADIAN ENTOMOLOGIST 135 



on posterior segments, assumes a yellowish-green tint. The wide 

 stigmatal band is the most conspicuous marking on the body. 



Third Instar. — Length 8 mm. Head 0.9 to 1.0 mm. wide. 

 The larva in this instar is similar in appearance to the second 

 instar. The venter is decidedly glaucous. All the stripes are 

 distinct and white in colour. The stigmatal band is wide and 

 conspicuous, and more or less tinged with yellow. Length before 

 third moult 10.5 mm. 



Fourth Instar. — Length 12 mm. Head 1.5 to 1.7 mm. wide. 

 Body dark velvety green, later becoming a paler green. The ad- 

 dorsal and lateral stripes irregular but distinct; stigmatal band 

 very conspicuous, extending to end of anal flap, the edges being 

 even. Medio-ventral stripe inconspicuous. All markings white. 

 Tubercles circled with white. Venter distinctly glaucous. Length 

 before fourth moult 15 mm. 



Mature larva — Fifth Instar. — Length 18 mm. Head 2.2 to 

 2.5 mm. wide, rounded, somewhat quadrate, depressed at vertex; 

 smooth, paler green than body and of a glassy appearance ; clypeus 

 high ; ocelli black, between the ocelli the skin is whitish , like enamel ; 

 labrum also whitish; mandibles reddish-brown. Body cylindrical, 

 lettuce green* in colour, with a yellowish reflection, excepting 

 venter, which is glaucous. The folds between the segments are 

 yellowish. The addorsal stripe, the subdorsal stripe and the 

 lateral stripe are thinner than in previous instars and hence are 

 not so distinct. In colour they are now decidedly yellow. The 

 wide, bright pale-yellow stigmatal band is very conspicuous from 

 the back of the head to the end of the anal flap, where it narrows. 

 The two dorsal and the lateral stripes are more or less broken 

 and sinuous in outline. The lateral stripe is distinctly wavy on 

 the thoracic segments. Medio-ventral stripe now distinct, of a 

 milky white colour. Spiracles whitish, ringed with black. Tubercles 

 minute, circled with pale yellow, each bearing a short black hair. 

 On abdominal segments tubercle iii is nearly midway between the 

 lateral line and the spiracle, and immediately above the spiracle, 

 excepting on segments 6, 7, 8, 9 and 12, where it is noticeably 



'Ridgeway's Colour Standards and Colour Nomenclature, 1912. 



