1893.] "'^ [Packard. 



Tlie Freshly Hatched Larvee. — Length, 0.8 to 1.2 mm. The body is oval, 

 cylindrical, with both ends nearly alike. The dorsal tubercles are lar^;e, 

 prominent, conical ; those on the second and third thoracic and first ab- 

 dominal segments are large, conical, and twice the size of those on the sec- 

 ond and third abdominal segments, while those (in one of my specimens) 

 on tlie fourth segment are as large as those on the first or seventh segment, 

 but in another no larger than tliose on segments 2, 3, 5 and 6 ; those on 

 segments 5 and are of the same size as those on segments 2 and 3; those 

 on segment 7 are as large as those on segment 1 ; tliose on segment 8 a 

 little smaller than those on segment 7 ; those on segment 9 of the same 

 size as those in the middle of the body. From each of these tubercles 

 arise three glandular hairs or seise, which are on the average about a third 

 longer than the tubercles themselves ; they are rather stout, tapering 

 slowly from the base to the tip, slightly curved, and divided at the end 

 (as seen under a i objective B eyepiece) into three short minute forks. 



There is a lateral row of tubercles, one to each segment, beginning 

 with the second thoracic, which are smaller or about half as large as the 

 smallest dorsal ones, and each bearing three setse. The segments are 

 quite well distinguished. The head is white, about one-half or two-thirds 

 as wide as the body ; the latter is at first pearly white, and later with a 

 purplish shade on the back ; the skin is very finely granulated, and the 

 spines are blackish towards the tips. 



Fig. 6. A camera sketch, from an alcoholic specimen, of the freshly 

 hatched larva ; both rows of dorsal tubercles are represented (author del.). 

 Fig. 7. A restoration of the same by Mr. Bridgham, corrected by the 

 author ; /, front view. Fig. 8, a. Third thoracic dorsal tubercle (or first 

 abdominal), bearing three spinules at the end, each terminating in three 

 short, minute, obtuse forks ; a', ends of four spinules ; from each fork or 

 branch a stria passes down to the base of the spinule. 



The following description of Stage II has been drawn up from a specimen 

 stated by Mr. Bridgham (to whom I sent the eggs and freshly hatched 

 young) to have molted once, and from which he made his Fig. 215. The 

 drawing was made July 20, the specimen feeding on the scrub oak. 



Stage II. — Length, 2.8 ; width, 1.4 mm. The larva is now at least three 

 times as large as before molting, and it would be difficult (as I have not 

 myself seen the larva alive in this stage) to believe that it could be in Stage 

 II, unless Mr. Bridgham had noted the fact on his sketch that it was drawn 

 "after the first molt." The larva has now assumed nearly the shape and 

 nearly the colors of the fully-grown larva, the tubercles even being a little 

 larger in proportion, and with the spines as numerous and as large as in the 

 last stage. The body is broad and flat, and the head is entirely concealed 

 by the prothoracic hood. The skin is finely granulated. The tubercles are 

 now completely difterentiated, and are indeed a little larger in proportion 

 to the body than in the full-grown larva. 



Fig. 9 represents a small anterior lateral tubercle after the first molt ; 

 the unicellular poison cells not distinctly seen; a, a larger lateral tubercle. 



