THE CANADIAN ENTOMOLOGIST. HSo 



PREPARATORY STAGES OF PYRUS TESSELLATA, Scud. 



nV G. H. FRENCH. CARBONDAI.E, ILL. 



Egg. — Diameter, .02 inch. Blunt conical, height about the same as 

 the diameter ; ridged with about 30 longitudinal stria% with shallower 

 cross striae. Colour pale green. Duration of this period six days. 



Young Larvai. — Length, .oS inch ; cylindrical ; head somewhat 

 cordate, two-thirds the width of the body ; the anterior part of joint 2 

 about one-half the diameter of the head, the posterior part as wide as 

 joint 3 ; each joint back of 2 with four low transverse folds besides the 

 very narrow fold at each end of the joint. Colour pale greenish with a 

 white sheen ; piliferous spots concolorous ; hairs erect, forked to about the 

 middle, the forks curving back towards the body anteriorly and posteriorly. 

 These are the hairs from the piliferous spots. Hairs on the body black, 

 hairs on the head and joint 2 white and not furcate. Head jet black ; 

 joint 2 pale yellow-brown with a black transverse bar just back of the 

 middle of the joint ; dark along the sides ; thoracic feet black. There 

 are eight hairs in pairs on the dorsal bar of joint 2. Duration of this 

 period two or three days. 



After first Moult. — Length, .15 inch. Shape not materially changed. 

 Head and joint 2 jet black ; hairs all white, shorter than before, more 

 numerous, the end capitate instead of bifid ; head and neck corrugated. 

 Duration of this period six days. 



After second Moult. — Length, .40 inch. Marked as before; hairs 

 still capitate, white j a dorsal and subdorsal line a little rnore plainly 

 green ; head and joint 2 profusely hairy, but the hairs are all short, 

 surface corrugated. Previous to this moult the larvse mostly lay coiled on 

 the surface of the food plant, but now they straighten out under a thin 

 silky covering. Duration of this period four days. 



After third Moult. — Length, .50 inch. CyUndrical, head about the 

 same width as the body ; black, covered with white hairs, each of which 

 has about six short side spurs from about the middle up ; joint 2 black, 

 with the dorsal bar red-brown with a whitish margin ; hairs on this joint 

 of two kinds, short and long, the long about one-sixth the width of the 

 body in length and very shallowly trifid at the end ; body, each joint 

 with five folds, the anterior twice the width of the others ; two forms of 

 hairs, one very short and the other long, each long one about the length 

 of those on joint 2 and arising from a white conical base, trifid at the 

 outer end ; the short ones arising from a shorter cone and capitate at 



