230 THE CANADIAN ENTOMOLOGIST. 



tubercles ; in line with spiracles a macular greenish-yellow band, more or 

 less pronounced, the spots or patches lying on either side the junctions of 

 the segments ; the spines longer in proportion than before, but slender, 

 and black ; head brown. To next moult 3 days. 



After 4th Moult. — Length .6 inch ; in from 3 to 4 days the larva 

 reaches maturity. 



Mature Larva. — Length 1.3 inch ; cylindrical, obese, the middle 

 segments much thickened, all well rounded ; color usually velvet-black, 

 thickly sprinkled with fine yellow points, caused by little tubercles ; in line 

 with spiracles a series of greenish-yellow patches lying on either side the 

 junctions of the segments, and forming a macular band ; but this is vari- 

 able, sometimes being obsolete, or nearly, at others nearly, and even 

 quite, continuous ; under side smoky-brown ; armed with 7 rows of mod- 

 erately long, slender, branching spines, which are usually black ; but in 

 some examples are pale yellow-white, and more or less reddish at base, 

 especially on anterior segments ; one of these rows is dorsal, three lateral; 

 the dorsal spines run from 5 to 12; the ist lateral from 3 to 13 ; the 2nd 

 lateral from 3 to 13; the 3rd from 5 to 12; besides these are smaller spines 

 along base and over feet; on 2 is a collar of 12 small spines, 6 on dor- 

 sum, 3 on either side ; feet black, pro-legs smoky-brown ; head rounded, 

 bilobed, the vertices rounded, thickly covered with sharp conical black 

 simple spines, of varying size, each tipped with black hair ; color dull 

 black. From 4th moult to pupation 5 to 6 days. 



Chrysalis. — Length .85 to .95 inch; cylindrical, the abdomen stout; 

 head case moderately produced, bevelled transversely and equally on both 

 sides, the ocellar projections not prominent ; mesonotum high, rounded, 

 and bears on summit a small nose-like ridge ; the dorsal tubercles rather 

 large, more or less gilded, the lateral, in two rows, minute, black ; color 

 varies ; usually reddish-gray, more or less densely reticulated with black ; 

 the lighter colored caterpillars make light colored chrysalids — greenish- 

 gray with usually a bronze sheen over dorsal area ; this is sometimes seen 

 in the darker examples ; the whole surface covered with a delicate bloom. 

 Duration of this stage about 7 days. 



There is much variation in the color of the caterpillars after 3rd 

 moult. What I describe above I have found to be the usual color at 

 Coalburgh. But some examples have the whole upper side spotted with 

 yellow, covering fully half the surface ; others are yellow-green, more or 

 less specked brown, and sometimes there are patches of brown on the 



