THE CANADIAN ENTOMOLOGIST. 8 



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Fifth stage : Head rounded, depressed at the sutures of the clypeus, 

 punctured, shining, usually black; width 4.1 mm.; cervical shield, anal 

 plate and legs black, except occasionally the shield, plate and nearly all 

 of the head is wine-red, or rather blood-red. All kinds of intergrading 

 examples occur. The body is usually black, rarely red, the stripes broad, 

 bright lemon-yellow, somewhat confluent posteriorly. Hair whitish, 

 rather abundant but not long, with other more numerous short, brownish 

 hairs. Bases of abdominal feet a little reddish. In two examples the 

 stripes were much narrower than usual, especially posteriorly, and were 

 much broken, the upper ones consisting of series of little yellow dots. 

 Both had black heads, and they were not alike, as one was much nearer 

 the normal form than the other. 



Ptipa : Formed in a subterraneous cell, cylindrical ; the abdominal 

 segments gently rounded ; sutures deep, capable of motion ; cases 

 moderately prominent, especially those covering the palpi ; two cremas- 

 ters, very short, each bearing two spines, the outer the shorter, all in a 

 transverse line ; cases finely creased ; body densely punctured ; colour 

 mahogany-red ; cremasters blackish. Length 24 mm ; width 7 mm. 

 The species is single brooded, though occasionally a few individuals may 

 emerge the same year in confinement, possibly indicating two broods in 

 the southern part of its habitat. 



Food plants : Sumach (Rhus glabra and R. typhina). 



Larvae from Duchess and Ulster counties, N. Y. x^bundant ; the 

 commonest species of Datana in the electric lamps at Poughkeepsie. 

 This larva is well protected by its coloration, which resembles the usual 

 colours (bright red and yellow) of dying Sumach leaves, and it is usually 

 on the lower parts of the bush where such coloured leaves occur that the 

 larvge amass themselves, especially when young, 



Cerura borealis, Boisd. — Fgg : Less than hemispherical — obtusely 

 conoidal, the base flat ; minutely shagreened ; colour black ; a little 

 lustrous, but not shiny. Laid singly on either surface of the leaf. 

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Second stage : Head red-brown, not shiny, the upper half darker ; 

 mouth parts blackish; width i.i mm. A pair of subdorsal horns on the 

 prothoracic segment, short and spinose ; stemapods 5 mm. long, only 

 slightly spined ; a transverse row of minute spines on each segment. Body 

 purphsh brown over the dorsum nearly to the spiracles, this colour cov- 



