428 EEVISION OF FAMILY SATURNIIDiE. 



only. This feature will be treated in detail under the diflerent generic 

 heads. The S genitalia also differ somewhat, retaining usually the bi- 

 lobed supra anal plate, but in some genera having it prolonged into a 

 simple flattened hook. There is much more structural variation here 

 than in the Attacina', aud less can be said under the general subfamily 

 definition. There is a difficulty, too, in deciding as to the correct generic 

 term for the species. Genera are here in abundance, but they have been 

 created on superficial characters, and it is not certain but that some of 

 the terms may have to be altered when a study of the exotic members 

 of this subfamily enables the typical species to be properly placed. 

 For the present I retain the names used in Mr. Grote's most recent 

 list, and find myself reluctantly compelled to add a new generic term 

 to the already long list. 



The European genus Saturnia needs revision in the light of my views, 

 and I think is too heterogeneous to be retained in its present form. 



As separated by me the following table will serve to identify the 

 genera : 



Anteiiii:¥ iu botli sexes pectinated to the tip, each joint with two branches to each 

 side. 

 Autenna3 of the <? with the joints equal; female with the upper joint shorter than 

 the low^r. 



Secondaries tailed Actias. 



Secondaries rounded Telea. 



AntenniB with the joints equal in both sexes, that of the $ slighter Saturnia. 



AntennsB of the male equally bipectinate; of the $ with a single pectination to 



each joint Calosaturnia. 



Antennte of the ^ with upper branch shorter than the lower; of $ simple or 

 serrate ; primaries with acute tip and excavated outer margin ; secondaries ocel- 



lated Hyperchiria. 



AntenuiB of (J with the upper branch shorter than the lower; of 9 simple; prima- 

 ries with outer margin obliquely rounded ; secondaries not ocellated.CoLORADiA. 



ACTIAS Leacu. 



This genus is easily recognized by the greenish color of the species, 

 as well as by the tailed secondaries. The primaries have ten veins, dis- 

 tributed as shown in the figure. Veins 7, 8, aud 9 are from one stalk, 

 vein 9 out of 8 just before the apex. The secondaries have 8 veins as 

 usual, of which 1 to 4, inclusive, run into the tail, leaving a long mar- 

 ginal space between 4 and 5, while 1 to 4 are closely crowded. The 

 head, body, and genital structure are shown at figs. 11 and 12 of plate 

 xiii. 



The supra anal plate here is bifurcate, the forks short and broad 

 with acute tips. The side pieces are better shown in the figure than 

 they can be described, and the structure of the body is also left to the 

 figure for explanation. The antenna of the female is like that ot the 

 male except that the upper branch of each joint is shorter than the 

 lower, making an alternate long and short branch. 



