17 



ing only ten tubercles on this segment; fourth segment bearing a tranYerse row of 

 six tubercles, the subdorsal ones each bearing two bristles, the second of irbiefa is 



inserted below the apex on the front side; each of the suprastimatal tuber* 

 three bristles, two of which are inserted below the apex, one on the front side and 

 the other on the outer side; the lowest tubercle bears but a single bristle; fifth to 

 tenth segments, like the fourth; eleventh segment like the fourth, except that the 

 lowest tubercle on each side is wanting, leaving only four tubercles on this segment ; 

 twelfth segment destitute of tubercles; head wholly black. 



Duration of this stage, six days. 



Second stage. — Body brownish black, a yellow dot on the posterior margin of the 

 first segment; a larger medio- dorsal yellow spot on the second, third, seventh, and 

 eighth segments; tubercles black, except the posterior four or six on the first segment, 

 all of those on the second, all except the lowest ones on the third, all on the seventh 

 and eighth, and all except the lowest on the ninth segment, which are largely or 

 wholly yellow; sometimes, however, the lowest tubercles on the second, seventh, and 

 eighth segments are black; first segment encircled in front and on the sides with a 

 row of sixteen long tubercles, each of which bears a long apical and several shorter 

 lateral bristles; there is also a small, yellow subdorsal tubercle each side of the 

 middle, near the posterior end of this segment, each tubercle bearing a bristle which 

 is three times as long as the tubercle itself; other tubercles arranged as in the first 

 stage, each bearing an apical and several lateral bristles, the apical one not appreci- 

 ably longer than the tubercle itself, except in the case of the tubercles situated low- 

 est down on each side of the body; the anterior of the two lowest tubercles on the 

 second segment is scarcely more than half as long as the posterior one; the anterior 

 of the two lowest tubercles on the third segment is minute and scarcely apparent; 

 head entirely black. 



Duration of this stage, seven days. 



Third stage. — Marked as in the second stage, except that all of the tubercles on the 

 ninth segment and the subdorsal ones on the tenth are yellow; tubercles arranged 

 as in the second stage; the subdorsal tubercles near the posterior end of the first 

 segment are now much larger, being scarcely shorter than the bristles at their apices; 

 the anterior of the two lowest tubercles on the third segment is scarcely one-sixth 

 as long as the posterior one, and is yellow; the four tubercles on the eleventh seg- 

 ments are noticeably longer than any of the others. 



Duration of this stage, eleven days. 



Fourth stage. — First segment yellow, the center above, including the greatei portion 

 of the space inclosed by the tubercles, black; second segment black, the anterior 

 and posterior margins and the sides broadly yellow, that on the posterior margin 

 being produced forward in the middle above; third segment yellow, marked with a 

 pair of black spots in front and with a second pail behind the subdorsal tube] 

 there is also a blaek spot in front of the upper of the two lateral pain of tubercles, 

 and another at the base of the posterior of the two lowest tubercles; fourth, fifth, 

 and sixth segments black, marked with an irregular silvery-white stripe between the 

 tubercles, the sutures of these segments yellow; seventh segment silvery-white, 

 marked with a small black spot between the two upper tubercles and with a I 

 one behind the upper of the two lateral tubercles; eighth segment black, the great* i 

 portion of the space between the subdorsal tubercles silvery white, and there is also 

 a spot of the same color at the base of the lowest tubercle; ninth segment black, 

 the middle of the posterior margin, extending nearly as far as the upper o( the two 

 lateral tubercles, silvery white J tenth segment black, the posterior margin silvery 

 white. which color crosses the segment obliquely between the subdorsal and the 

 upper of the two lateral tubercles; eleventh segment like the tenth, except that 

 there is a silvery-white spot ;it the base of the lower tubercle; t Weill h segment 

 wholly black ; there is also a silvery white medio-dorsal line extending from the 



198(36— No. 30 2 



