122 Journal New York Entomological Society. [Vol. xm. 



fornia. I imagine this will prove synonymous with tibullns Scudd. & 

 Burg., which I do not otherwise know. The genitalia of lilius are 

 much like the figure of those of tibullns. In the lilius examined the 

 middle lobe of the left side piece is smooth without spines ; otherwise 

 I see no essential difference. 

 T. propertius Lintner. 



Occurs in the Pacific states. Specimens from Colorado formerly 

 identified as propertius I now consider to be large examples of afra- 

 nius. Their genitalia differ from the propertius of California, which 

 proves there are two species although they are so similar. 

 T. juvenalis Fabricius. 



Occurs in the Eastern states. 

 T. horatius Scudder & Burgess. 



Occurs in the southern Atlantic states. I am unable to differ- 

 entiate Lintner' s petronius from Florida from this species except by the 

 more contrasted coloration and larger spots. I do not think that they 

 are the same, but rather that petronius will prove to be juvenalis with- 

 out the white spots on the hind wings below. This character is not 

 improbably evanescent, and is the only one I know of to separate 

 petronius and juvenalis. T. plautus Scudd. & Burg., hitherto un- 

 identified, is not improbably another synonym of juvenalis. The figure 

 of the genitalia does not appear specifically different, supposing the 

 pieces to be in a different position. The right clasp may be broken 

 and its basal lobe somewhat uncurved. Considerable allowance has 

 to be made in the appearance of the figures of these organs, but there 

 is really no great variation, though their complex appearance makes 

 them difficult to interpret at first. 

 T. funeralis Scudder & Burgess. 



Occurs in the western states, Texas, Arizona, California. 

 T. pacuvius Lintner. 



From Colorado and Arizona. 

 T. clitus Edwards. 



From Arizona and Mexico. This seems the same as albomargi- 

 natus of Godman & Sal v in. 

 T. tristis Boisduval. 



Occurs in the western states, Southern California, Arizona, 

 Mexico. I cannot differentiate Edwards' latins from this. 



The following table separates the species of Thanaos by the male 

 genitalia for those species that have been examined : 



