19 



Orcus chalybkus. — Egg. — Elongate -oval or elongate- ellipsoidal, from somewhat 

 over twice to nearly three times as long as broad, surface polished, the upper end 

 scabrous and on one side of the middle bearing* a white, Battened, branched process, 



having somewhat the appearance of an antler of a Moose- deer; coloi of egg, Light 



lemon yellow ; length, lp n,n . Placed on one end in clusters of from 4 to 10 eggs each. 



Time from deposition to hatching, eight days. 



Larva. — First stage. — Body yellow, the tubercles dusty; first segment surrounded 

 in front and on the sides by a ioav of ten long tubercles, and with a transverse pair of 

 much smaller tubercles on the dorsum near the posterior end of this segment,each of 

 these smaller tubercles being as broad as long; second segment bearing a transverse 

 pair of long tubercles, each size beside a dorsal transverse pair of much smaller tu- 

 bercles, and a single small tubercle in front of each of the lowest tubercles on this 

 segment; each of these small tubercles is as broad as long; segments three to eight, 

 each bears a transverse row of six long tubercles; segments nine and ten each bears 

 a transverse row of four long tubercles ; eleventh segment bearing a single transverse 

 pair of long tubercles; twelfth segment destitute of tubercles; each of the small 

 tubercles above mentioned bears a single long bristle at its apex; each of the long 

 tubercles is truncated at its apex, where it bears a stout bristle which is usually 

 longer than the tubercle itself; in. addition to this, the second tubercle on each 

 side <>f the middle of the dorsum on the second and third segments bears a sec- 

 ond long, stout bristle on its outer side a short distance below the apex: each of 

 the long tubercles also bears one or two short lateral bristles; the surface of the body 

 is thinly covered with minute tubercles, each giving rise to a very short yellowish 

 hair; head light yellow, thinly covered with slender bristles and bearing three 

 black ocelli each side in the form of a triangle. 



Duration of this stage, six days. 



Second stage — Same as in the first stage with the following exceptions : Each of the 

 small tubercles in the transverse subdorsal pair near the posterior end of the first 

 segment, as well as those in the subdorsal pair on the second segment and the fore- 

 most one of the two lowest on each side of this segment, is nearly three times as long as 

 broad; each of these smaller tubercles bears a single apical bristle which is slightly 

 longer than the tubercle itself, and each of the remaining one bears a pair of apical 

 besides several lateral bristles of various lengths, but none of them are as long as 

 the tubercle itself. 



Duration of this stage, six days. 



Third stage. — Same as in the second stage, with these exceptions: Dorsum of 

 ments two to nine black, most extended mi the second and third segments; the 

 tubercles in the dorsal pair near the posterior end of the first segment and also 

 those on the second segment are nearly as long as the adjacent ones, being BOme- 

 what more than four times as long as broad, but the anterior of the two lowest 

 tubercles on each side of the second segment is still much shorter than the others, 

 and is scarcely over two-thirds as long as the posterior one; each of these tubercles 

 bears several short lateral bristles. 



Duration of this stage, seven days. 



Fourth stage. — The black of the dorsum is extended so as to include four rows of 

 tubercles, and on the second and third segments it is divided by a medio -dorsal 

 yellowish line. There is also a yellowish line on segments four to nine between the 

 first and second rows of tubercles each side. The black coloring on the outside ot' 

 these lines is not so intense as it is within them. The anterior of the two Lowest 

 spines on the second segment is li\e-si\ths as long as the posterior one. Otln I 

 as in the preceding stage. Length, when fully grown. 5 m,n . 



Duration of this stage, fourteen days. 



Pupa. — Tight citron yellow, head almost surrounded with black ish, first thn | 

 ments each marked with a pair of oblique black dorsal spots, those on the second 



segment the largest; fourth segment marked with a pair of small black dorsal dot 8 



