196 MEMOlliS OF THE NATIONAL ACADEMY OF SCIENCES. 



The protlioracic segment is wider than the siieceeiling ones, with two very large dorsal 

 piliferous tubercles, situated far apart, while those on the lueso- and nietatboraeic segments are 

 minute and situated not so near together as those on the abdominal segments. The tubenles on 

 the first, third, eiglith, and ninth abdominal segments are larger than those on the other segments. 

 They are all darker than the body, and dull amber-brown in color. 



The body in gom'ral is greenish yellow,- with a ])ale reddish band around the protlioracic 

 segment and around the hrst, third, and eighth abdominal segments. The hairs are in most cases 

 about twice as long as the body is thick. On the head are a few scattered simple hairs, pointed at 

 the end. Those on the segments behind the head are in general davate at the tip. Those of the 

 two large protlioracic tubercles and of the larger warts on the eighth and ninth abdominal 

 segments are nearly twice as long as most of the others, and are slightly bulbous at tip. Those 

 on the meso- and inetathoracic segments are about a fourth longer than most of those on the 

 succeeding segments to the eighth abdominal. 



The larva. just before the first molt is nearly twice as large as when first hatched, Imt it can 

 be easily distinguished by its hairs alone from those in the second stage. 



The thoracic legs are black, the abdominal, including the anal legs, dusky. Before molting 

 the larva doubles in length, finally being ti mm. long. 



Second staye, after the Jirst molt. — Observed to molt July 19-24. Length, 7-S mm. The larva is 

 very diflerent from the preceding stage. The head, though smaller in proportion to the rest of the 

 bod}", is still much wider than the body, ending in the vertex in two conical tubercles, much as in 

 the adult; color of the head brown, with four rows of large round pale spots, three in each row; 

 the sides of the head and occiput pale. Prothoraeic segment with two large black-tipped conical 

 tubercles, and two much larger ones on the first and eighth abdominal segments, those on the 

 first being larger than those on the eighth segment and several times larger than in the first 

 stage; there is a smaller pair on the fifth abdominal segment. Anal legs long and slender, of 

 much the same pio])ortions as in the fully fed larva. Color of the body greenish, but the 

 prothoraeic and first, third, fifth, and eighth abdominal segments reddish. The piliferous 

 tubercles on the side of the body are not so large and ])rominent as in Stage 1. 



The hairs are not quite so long as the body is tliick and of more uniform length all over the 

 bodj' than in Stage 1, and decidedly different in shape from those of the first stage; they are 

 shorter, thicker, and somewhat shovel-shaped, being broad and flat at the end and slightly 

 notched or toothed on the edge, the flattened portion being striated; those of the head are still 

 simple. Those of the two prothoraeic tubercles are twice as long as those on the meso- and 

 nietathoracic segments, the hairs on the latter two segments and on the alidominal being 

 somewhat shorter than the body is thick; those of the two larger tubercles on the eighth and 

 ninth segments are a little longer than those on the smaller tubercles at the end of the body. In 

 nearly all the hairs the shaft is, under a i-inch Tolles objective, seen to be finely spinulated. 



Third stage, after the second molt. — Observed to molt August 1-2. Length, 10-11 mm., finally 

 becoming 13-11: mm. The head, tubercles, and hairs (seta-) much as before, the head retaining the 

 same style of markings. The colors of the body, however, have changed; there is au irregular 

 double dorsal reddish resinous line on the thoracic segments. On abdominal segments 2 to 4 is a 

 single line, and on the same segments the dorsal tubercles are yellowish green, as are those on 

 segments 6 and 7. The ground color of the VK)dy is yellowish green, irregularly marbled on the 

 sides with resinous red. The anal and other abdominal legs are tinted with reddish. There is a 

 lateral reddish line along the sid<'s of the thoracic segments; a double dorsal reddish line on the 

 seven terminal abdominal segments extending out on the uplifted anal legs (not developed in 

 Stage II, though faintly indicated). 



Those observed August 4 later on in this stage had changed a little since molting; have 

 assumed more of the distinctive coloring of the fully fed larva; the yellowish green parts, 

 esjjecially on the thoracic segments, are now of a bright pea-green, while the silvery white 

 V-shaped mark on the si.xth to eighth abdominal segments, so charac^teristic of the genus 

 Schizura, is now very distinct. (This mark is faintly indicated in the previous stage by two broad, 

 .slightly converging, whitish yellow dashes on the seventh segment and a median pointed whitish 



