March, 191-.] WiLLIAMS : NoRTH AMERICAN LaMPYRID.E. 27 



From August 8 to lo, approximately, most larvae of this brood had 

 passed into the second instar, having undergone one ecdysis. As 

 upon hatching, they are soft and whitish for some hours, and meas- 

 ure about 5 mm. in total length. By August 20, many were in the 

 third instar and 7 to 8 mm. long. The color is now quite dark, with 

 the pale tergal markings conspicuous. The development of the brood 

 as a whole becomes less and less uniform so that we meet with larvae 

 of the same age but varying considerably in size. I lost count of the 

 instars beyond the fourth, after which there must have been three 

 or more ecdyses. Some of my second-year larvae moulted in the 

 laboratory during winter. It is certain that the insect requires the 

 greater part of two years to reach the adult stage, and it is not im- 

 probable that in some cases a longer period is necessary. The full- 

 grown larva is from about 16 to 18 mm. long, being nearly three 

 times as long as wide. The head is subcylindrical and about one 

 third as wide as the prothorax; the antennae are three-jointed, the 

 first joint being membranous, the second partly so, and the third with 

 a terminal and subterminal sense-organ; the mandibles are much 

 stouter and blunter ' than in PJwtinus, but like the latter they are 

 arcuate and also notched below the apex. The body is much de- 

 pressed, otherwise it is fusiform, being widest a little above the 

 middle ; the prothorax is the longest segment and shaped much as in 

 the adult ; the abdominal tergites are curved posteriorly, especially the 

 caudal ones. The legs are rather spinose. The head is largely pol- 

 ished black, the mouth-parts brownish, the dorsal part of the body 

 dull brownish, sometimes quite dark, and having subdorsal yellowish- 

 white stripes of irregular nature disposed as follows: a large one from 

 the anterior border of the prothorax, a smaller one from its posterior 

 edge; these are more faintly repeated on the meso- and metathorax; 

 on the abdomen there is a pair of more or less broken inbowed stripes, 

 becoming obsolete posteriorly, and a similar blotch near the lateral 

 edge of each tergite. The dorsum is more or less irregularly dotted, 

 in deep punctations, with blackish, which serves to darken the color 

 as a whole; blackish spots are grouped inside the pale abdominal 

 lunules, and a more or less broad arcuate line cuts into the subdorsal 

 markings from within. On the ventral surface the color is dirty yel- 

 lowish white except for some latero-ventral blotches of brown, which 

 however are absent on sternites seven and eight and a part of nine. 



