228 [December 



totally unrepresented, while the s.f. Ftlloihntas is very limited in ex- 

 tent, though, as I consider, varied in expression. The Arctu'dse are 



author, and tliat it has been loosely used for a variety of species, I am con- 

 strained to propose a new name for it. The third species, Phakena {Aflirus) 

 Promefhca Drui'v, has been made the type of the genera Cullosnmia by Dr. Pack- 

 ard, and is established under that name, which is wdl selected in the view 

 that it jiossesses close affinities with Simla cyntliia. 



SAMIA. Ilubner. 



Type: PhaJiaia (Aftarus) Cynthia. Di-ury, Ilf. Exot. Ins. Vol. 2. p. II). Plate (i. 

 fig. 2. (1773.) 



The head is large and prominent, well advanced before the prothoracic parts. 

 The labial palpi are sufficiently {(rominent, advanced as far as the wide clypeus. 

 which is thickly covered with short hair. The anteniife are moderate; bi-pecti- 

 nate in both sexes to their tips, glabrous, testaceous. The pectinations are but 

 little shorter in the female than in the male, clothed with fine and very short cilii« 

 in both sexes. Wings ample; primaries falcate, more than twice as hmg as the 

 body. Nervules short; first s. c. at base approximate to second, th> latter ar- 

 cuate at base and tlirowingoff the third s. c. at one-third of its length, the latter 

 nearly straiglit, very slightly inversely arcuate. First mL-dian uervule promi- 

 nently arcuate; second median straight, the interspace wide. Discal space 

 large. Subcostal nervure basally straight. Secondaries hmg, ovate, their in- 

 ternal margin more than twice as long as the abdomen; costal margin short: 

 external margin long and obliijue, very slightly rounded. 



The immature stages of Scnnin Cynihia ati'ord good distinctional characters 

 when compared with those ui Plutym rain ; these nearly ally the genus to Callo- 

 .snmia. The cocoon resembles that of C'lHo-samia in shape, though of a softer and 

 looser texture. In making it, the larva fixes it incompletely to the branch 

 above by an extension, wrapping a leaf around the cocoon itself, in l)oth of 

 these actions recalling the habit of C.illosainia promztheu. 



The genus Attacus, Linn., should be restricted to ^-1. Atlas and certain more 

 recently described species under the genus, such apparently ah Atta/ms Jlopferi 

 Felder. 



S. Cynthia has, I believe, been taken in the vicinity of Philadelphia, under cir- 

 cunutances which warrant a belief in the possibility of its acclimatization with us. 



PLATYSAMIA, nov. gen. 

 The clypeus, which is narrower than in S'lmia. and broader than in Cdllom- 

 mia, is clothed with longer hair, which depends downward, hiding tlie very 

 small laijial palpi, still further hidden by an inferior long tuft of hair. Maxilhe 

 ■wanting. Head small and sunken in the prothoracic parts. The antennte are 

 long and strongly bi-2:)ectinate. In the male tlie pectinations are full twice as 

 long as in the female, and densely ciliated. Mesotliorax broad and stout, longh- 

 and loosely haired. Abdomen stout, and heavier and longer than in Sainia. 

 "Wings broad and amjile; primaries hardly falcate, since there is a very slight 

 depression in the external margin at the extremity of the third s. e. nerviile. 

 Nervules long and arcuate; third s. c. arcuate, (thus opposed to Sainia) so also 

 the second median nervule. Discal space centrally narrower than in Samia .- 

 sub-costal nervure bent downwardly at base. Secondaries broad and ample: 

 external margin rounded; anal angle less prominent than in either Sainia or 



