62 



MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



Tmago. — i iiiid 9 licad us in Aiiisotu, Ijut tending in front to be more triangular, and nar- 

 rower toward the labnini; it is widest in A. hicolor, narrowest in ^1. hlj<eeta and especially in 

 A. iiiontezuma (PI. XIX, Hg. <J). Antennae of S bipectinate, with 17 to 18 pairs of pectinations 

 which are exactly as in Anisota; the 12 joints of the filiform extremity very short: in $ simple, 

 except in .1. hicolor, which has 10 pairs, of short, thicl<. subclavate pectinations, a single pair to 

 each joint. Palpi short, varying in length, just visil)le. not reaching the front. Maxilla> varying 

 in length, not visible in ^1. hlcoJor and ^1. helJighrodtii, but in ^1. sithanffulata, the more primitive 

 form, they are comparatively well developed, though separate from each other; they are curled 

 up, and are nearly as long as the tiliform tipof the S antenna^; the}- are also present in A. iiMirdii, 

 but very slender and short. Fore wings either of the usual generalized form, with the costa 

 convex toward the apex, the latter obtuse, and the outer edge full (^4. hieolor. A. qiiadrlJineatn, 



Fig. 6.— Distribution of the subfamily Ceratocamiiiiui-. 



^1. Iielliijhrodfii and ^1. <ilholineata), and the hind wings rounded: or thej- are triangular, with the 

 outer edge oblicjiie, not fidl, and the hind wings subtriangular, and not reaching beyond the basal 

 two-thirds of the abdomen. The abdomen of the S is acute at the end and with a tuft on each 

 side of the tip in .^4. suhaiKjitlnta. 



Venation: Much as in Anisota, there being no vein III,; vein IIIj arises midway between 

 the anterior discal vein and base of common stalk of veins III, and III/, the greatest departure 

 is in ^4. sulanf/)i/af(i (PI. XXXVIII, tigs. 1, Iff) where III, arises at the same point as the anterior 

 discal vein, in front of the origin of vein IV.,: venation of hind wings nearly identical with that 

 of Anisota. 



Coloration: Ocherous. with the hind wings more or less pink; the markings ditier very 

 much in the difierent species; in ^i. hicolor there are two twin discal dots, in ^4. Iwilighrodtii the 

 fore wings are stone gray; in .1. idholincatn the lemon-ocherous wings are crossed by conspicuous 

 white lines, and in A. his,ct<i there are no discal spots, M'hile in ^4. sahanguhitu and .1. inoritcziuua 

 there is a large discal spot on the underside of the fore wings. 



