NORTH AMERICAN LEPIDOPTERA. 225 



Under this generic term I unite the species of Calcmjmbolm Grt. 

 The essential points wherein the thi'ee species here united differ from 

 the others of the family, are the shape of the secondaries, and the 

 structure of the male genitalia. 



Calasymbolus was created by Mr. Grote (Bull. Buff. Soc. N. 8ci. i. 

 23) for P. astylus, and viyops was (loc. cit.) placed in Paonias. As- 

 tyltts and myop^, however, were so closely related that they were 

 united under the same term in later papers. Mr. Butler adopts the 

 genus Calnsymbolus, but phices in it also geminafus and cerysii. Mr. 

 Grote later created the term Eamwrlnthus for geminatus. In his 

 latest opus (The Hawk Moths of North America) the generic term 

 Calasymbolus is retained ; Evsmeriuthus is made a subgenus of it with 

 geminatus as sole type, while for cerysii the subgeneric term Copisme- 

 rinthus is proposed. It will thus be seen that there was no very 

 definite idea conveyed or understood by Mr. Grote under the term 

 Calasymbolus. Paonias lias been very generally used for exccecatus. 



The three species which I place in the present genus agree also in 

 general pattern of maculation. In all, there is on the primaries an 

 oblique darker line or dark shade from the basal third of costa to or 

 near the anal angle, and a series of similar undulated transverse 

 lines beyond the middle. The secondaries have similar ocellate spots 

 and the costal half of wing is darker. 



Exccecatus differs from the others in more distinctly ciliated male 

 antenme, in the rather evenly scalloped margin of primaries, and in 

 the red color of secondaries. The abdomen is also stouter, and the 

 species thus forms a distinct group in the genus. A greater number 

 of entirely similar species might authorize the restriction of Paonias 

 to forms of that kind. 



Myops is deep brown, more pui'plish than the preceding, the macu- 

 lation distinct. The primaries are truncate at the apex, slightly ex- 

 cavate to vein three, where the margin is somewhat produced ; thence 

 slightly excavated again to the produced anal angle. 



Astylus 9 agrees in wing form. My single % differs in having 

 the outer margin nearly entire, the angles being scarcely indicated. 

 The species is much paler, more yellowish brown, and the transverse 

 maculation is much more indistinct. 



The agi'eement in genital structure as well as in the shape of sec- 

 ondaries unite these three forms. The differences in the outer mar- 

 gin of the wing are hardly of generic value. It may be added that 

 the supra-anal plate of the male is modified into a flattened, obtusely 

 terminated hook, and the inferior projection is small and slight. 



TRANS. AMEE. RNT. SOC. XV. (29) SEPTEMBEK. 1888 



