66 AUG. R. OROTE. 



neata, that the specific dif^tinctions between the two are not very ob- 

 vious, though, in the present paper there are regarded as sufficient for 

 the purpose of validating the species. We have seen how closely 

 Platijpterijx fahula, Grote, resembles the European Drepana falcataria. 

 The propriety of considering Laspeyres' Fam. B as a different genus 

 from his Fam. A, is additionally evidenced by its description as dis- 

 tinct under the new name of Ednpteryx by Dr. Packard, a name 

 which should, however, give way to that of Laspeyres as amended by 

 Stephens. Laspeyres' third section of Platypteryx, his Fam. C, 

 Ijeaeh, in 1815, erects into a distinct genus under the name of Cilix. 

 which has found universal acceptance. This genus, which contains 

 but a single European species, C. spinula, is unrepresented in the 

 United States. A fourth genus, Dryopteris, Grote (18G2), is unre- 

 presented in Europe, and falls into a distinct section of the sub-family, 

 differing more strongly from any of the sections of Laspeyres' genus 

 Platypteryx than do these sections among themselves. It has an Asiatic 

 ally in Oreta, Walk.^ which closely resembles it in ornamentation, but 

 is much stouter. 



Two species described as North American are not considered valid 

 in the following list of our species. These are Drepana fasciata. Htf- 

 pheiu and Drepana viarr/inatn, Walk. Since Stephens and Haworth 

 wrote, the first is unidentified. It should be recognisable from the 

 character ascribed to its secondaries; "posterior wings with a single 

 streak," which will at once separate it from either of our two species 

 of Drepana ; this character is unusual, and reminds us of the Phalaenid 

 genus Drepanodes, Gaenef. The second I have seen in the British 

 Museum. It is a simple variety of Dryopteris rosea. In the Berlin 

 and British Museums are identified specimens of Platypteryx genieula, 

 Grote. All the species here accepted are known to me. No Platyp- 

 terygides appear to be known from Califoriiia. 



Family BOMBYCIDAE. 

 Subfamily Platypteryginae. 



DREPANA, SrA/-an^- (1802). 

 arcuata, Walker. 



Drepana arcuata. Walker, Cat. B. M., i>. 1104, (1855). 

 Tlatypteryx fabida, Grote, Proc. Acad. Nat. Sei., p. 59, (1802). 



genieula, Grote. 



Plcitiipto.rijr genicvla, Grote, Proo. Acad. Nat. Sci., p. 59, (1SG5;. 



PLATYPTERYX, Laspq/rcs (180 8). 

 bilinoata. Grote, 



Edapteryr hilineata, Packard, Proe. Ent. Soc, Phil., p. .374, (186t). 



