60 



Stage IV. 



Millimeters. 



Average length after ecdysis 15. 65 



Average length before ecdysis 17. 85 



Average width of head cast 1 . 33 



Body slightly narrower behind. Pale translucent, minutely hairy; marked as 

 follows: 



Dorsal surface reddish, the median line pale yellowish, as are also three more pale 

 lines on each side of it. Of these the lateral ones are broken behind segment X. 

 The dorso-lateral stripe is a deeper rust-red and the stigmatal stripe which lies imme- 

 diately below is broad and pale yellow, sometimes tinged with brown above. Below 

 this is a stripe of reddish brown which is waved along the lower margin, embracing 

 tubercle vi, narrowing gradually beyond the sixth abdominal segment and embracing 

 the bases of the thoracic legs anteriorly. Underside of body pale, with indistinct 

 brownish marking on the basal abdominal segments; median line of orange spots 

 sometimes to be seen, as is also a pair of grayish side lines. 



Head equal to following segments; brownish yellow or brown, with darker oval 

 spots, and an oblique dash on each epicranial lobe, which forms an inverted V-shaped 

 marking on the front; surface furnished with many pale setse. Mouth parts darker 

 and gular surfaces pale, the ocellar spots in a strongly curved line. Cervical shield 

 shining, blackish, with a conspicuous pale dash along each side, a faint pale median 

 line and four pale spots which form a square on the disk. Shield broad with obtuse 

 angles, the front margin sometimes notched, the sides and posterior margin sinuate. 

 Anal shield inverted, crescent-shaped, triangular, or four-sided, dusky or concolorous 

 with the body. Legs shining black. Prolegs pale, except anal ones, which are black 

 with whitish markings externally behind, the area of tubercle viii dusky. Prolegs 

 about equal in size, first and second pairs more slender. In locomotion the hump 

 at the base of the abdomen is less noticeable. Spiracles black, inconspicuous, more 

 noticeable before and behind. 



Tubercles about the same as in Stage III, but more conspicuous and with black 

 setse. On segment I the two contiguous pairs are directly above and behind the 

 spiracle, respectively. On segments II and III, tubercles i, ii, and iii gradually 

 increase in size by about one-half, respectively; tubercle iv often as in the next 

 instar; vi adjacent to v on segment II. On segment IV, i and iii are equal and the 

 largest, and ii, iv, and v equal, each about half as large as i; i, ii, iii, and iv are con- 

 spicuously conical and the second of viii sometimes marked with paler dots. On 

 segment V, iv is closer to the spiracle, and iii and iv are adjacent, the latter irregular. 

 On segment VI, i and ii are equal and iii is the largest. On segment VII, vi is 

 slightly larger and more depressed; still more so on segment VIII, while on segment 

 IX it becomes very large and quite flat. On segment X it is again much smaller 

 and nearly the size of iv; on this segment iv is below and behind the spiracle almost 

 in a line with v. On segment XI, iv and vi are again equal. On segment XII, 

 i is the largest, and iii one-half smaller. On XIII, the anal segment, vii consists of 

 five tubercles on the outer side of the anal proleg, and viii is the same. 



Stage V. 



Millimeters. 



Average length after ecdysis 24. 27 



Average length before ecdysis 28. 32 



Average width of head cast 2. 03 



Body tapering slightly behind; translucent, the ground color ocher-yellovv or paler, 

 marked as follows: Median line pale yellowish, bordered on each side by alternating 

 lines of brown and pale yellowish; of the former there are three on each side, and 

 of the latter four, the inner brown line being widest and the outermost pale one 



ii 



