152 



a*^'^*;^ 



Iho villi; is ojXMi (outwardly). Tlu^y arc larger than the nvcM-agc in 

 C7'ainbiif<. 



Spccil'ic (Uidnictcrs. -'V\\c ground color varies oonsidenibl y ; tli(> young 

 are more or less pink, wili\ IkvuIs darluM*, usually black, the corneous 

 spots smaller as a rule, and the acc(>ssorv on(>s t"e\v(>r 

 than in theailull. in \v(>ll-gi'0\vn larva\ an accessory 

 spot may in ccM'tain cases grow smaller on successive 

 S(\gnuMits of tin* sanu> larva until it vanishes, or a 

 similar variaticm may occur on the same segment of 

 dilTiMvnt indiviiluals of a species. However, these 

 spots may be us(>d to som(> extent in the recognition 

 of sp(M'i(>s, and thosc^ here recognizetl are scjiarated 

 by nn'aiis ot" thcMU into two groujis. Taking the lirst 

 li\g-b(>aring s(\i;nuMit (th(> third abdominal) in all 

 cases, in the first group of s|)ecies (l''ig. 141, b, c) the 

 spots are smalhM" than in the second, sometimes quite 

 small; th(M-(> is very rarely even a trace of an acces- 

 sory spot behintl tlie substigmatal, the stiguKital is 

 usually absent, and even the suprastigmatal acces- 

 sory may also be wanting. In tlie second group (l*'ig. 

 1 II , (f) tlu> sjiots are usually larg(> and well marked, 

 with two acc(>ssory lateral spots present on the 

 post(M-ior fold Ix^hind the two S(>tifiM'ous ones, and 

 usually the extension of the suprastigmatal behind 

 thi> spiracle, often tletached, herein called the stig- 

 niatal s|)ot. 



The head markings of the first group (Fig. 139, a), 

 except in pale s[)ecimens api)arently fn'shly molted, are well defined and 

 cUnirly composeii of aggregations of small spots; the lower setiferous 

 pnnctnr(> o{ the two in the substigmatal spot (Fig. 141, />,r) is normally 

 only slightly in advanc(M>f the upper, but wIumi the botly is shrunken and 

 contractinl the Vu\c conni>cting tluMn is mor(> obliipuv In this group, 

 Cramhus mutabilis (lug. lll,c) is easily known by its color pattern of 

 whitish blotclu^s in 

 six litu\s along tlu> 

 dark coloi'cd body, 

 giving it a striped 

 appearance. In tlu> 

 23 s[)ecinnMis of this 

 species the acces- 

 sory tubercles, ex- 

 i'e|)t rar(>ly the stig- 

 niatal, are wanting. 



,, , . ." Fui. 139. \U\uho( Cnimhiishnvtv: •!. C.trisiHtis; b, C.luUolellHS. 



Ot the r(>manung Enlarged. 



Fia. 138. Crdmhiis 

 viultihilis, l:uv:i, dor- 

 smI viow. .\lioul fi>ur 

 tiiiu's iiatutal .«i/.o. 



