THE CANADIAN ENTOMOLOGIST 127 



less due to this factor. They kindly secured some of the early 

 stages in 1916 which were missed the previous year, and such full- 

 ness as this note contains is largely due to their efforts. 



Stage IV. — Of the cylindrical type common to the genus. 

 Head honey yellow, mouth parts concolorous, the ocelli only darkly 

 marked. Body of deep purplish brown tone, contrastingly marked 

 by the longitudinal dorsal, sub-dorsal and sub-stigmatal white 

 lines, the latter on the six posterior segments merging ventrally 

 to a concolorous under surface of whitish. These lines are broken 

 on the first four abdominal segments, which appear as a dark 

 girdle completely encircling the larva. The cervacal shield sharply 

 bordered with black laterally, with the other plates and tubercles 

 normal. Tubercle IVa on joint ten begins to show definition. 



Stage V. — Similar. 



Stage VI. — The dark body colour still holds, with the lines 

 which are always broken on the first four abdominal segments, 

 broad and contrastingly drawn in white. Tubercles attain greatest 

 definition in this stage, being black for the most part and those 

 laterally surrounding the spiracles very conspicuous. On joint 

 ten the spiracle is surrounded by five tubercles. III, Ilia, IV and V 

 about the size of the spiracle, while IVa is even larger and very 

 close to the upper corner, caudad; on eleven, III and Ilia are merged 

 into an elongate plate bearing one seta. The anal shield is heavy, 

 rugcse and brown^not black. Ventrally a salmon tone prevails 

 that is quite characteristic. 



Maturity. — ^Similar to preceding, the colour lighter but 

 does not fade to the frequent translucence of this instar. 

 Proport^ionate to the increase in size, the tubercles seem smaller. 

 Observations were from June 14 to Aug. 15, when all larvae had left 

 the plants to pupate. The duration of stages increases toward 

 maturity with the last instar lasting twelve days in two cases 

 observed. Length of larvee from the stages, approximately, 34, 

 39, 45 and 50 mm. 



Eryngii larva; approximate closely cerussata, differing in 

 coloration of the last stages, and in having the anal plate brown, 

 whereas it is black with the latter. 



The burrow seems to be deserted generally for pupation, but 

 two instances occurred in confinement where this was not so. 



