THE CANADIAN ENTOMOLOGIST 125 



cocoon, had claimed 85% of the larvae encountered. Larvae were 

 observed in the following stages. 



Stage V. — The general features as given for the preceding 

 species apply. The colour is a warm shade of brown, the longi- 

 tudinal lines are narrow and not so contrastingly white, the dorsal 

 alone continuous. On joint eleven tubercles III and Ilia are 

 fused into a plate about three times the size of the spiracle. Ilia 

 occurs distinctly on the preceding abdominal joints; on joint 

 twelve the plates are stronger than with the compared form. 



Stage VI. — Little change, colour paler and more of a sienna 

 tint, tubercles appear with better prominence. 



Stage VII. — General characteristics normal; colour a, pale* 

 dull, pinkish hue, fading to translucence at the sutures; lines in- 

 distinct; the blackish tubercles stand out in greater prominence, 

 of the lateral ones. III on joint two, and the fused III and 1 1 la 

 on joint eleven are most conspicuous, the latter constituting the 

 chief specific character. This plate is four or five times the size 

 of the spiracle. Setae are so weak as to be unnoticeable without 

 a lens. The first pair of prolegs on joint six are aborted in early 

 stages, and never develop so fully as the succeeding three pairs; 

 crochets here number twelve, while for joint nine the number is 

 eighteen. Larval length, 30, 38, 46 mm., for the stages respec- 

 tively. 



A feature of individuality with stenocelis is the prominence 

 of tubercle III on joint eleven, which has evidently taken in Ilia, 

 While these plates often coalesce in other species of the genus,' 

 there is not the comparative enlargement as in this case. Cerus- 

 sata and cataphracta are examples of large tubercle development, 

 III and Ilia fuse, in this instance, into a large plate with them. 

 But it does not reach the proportions attained in stenocelis. With 

 inquaesita this plate is of unusual size, since the remaining tuber- 

 cles are so very weak. Tubercle 1 1 la on the abdominal joints of 

 Noctuid larvae seems always obscure and generally wanting, es- 

 pecially is this so on joint eleven. With such a well tubercled 

 larva as that of Achatodes zeae, Ilia seems normally wanting on 



