178 LEPIDOPTERA. 



Godman and Salvin in the Biologia Centrali-Americana 

 erect a new genus for this species as follows: '' Cocceius 

 Nov. Gen. Eudajmis pylades, which we make the type of this 

 genus, has been usually placed with bathyllus in the genus 

 Thorybes, but the presence of a costal fold to the primaries of 

 the male indicates its true relationship is rather with Acha- 

 laurus {lycidas). From the latter genus it differs in the 

 shape of the secondaries, which are much more rounded at 

 the anal angle." I have given the description of the above 

 described genus, as the costal fold is the surest means by 

 which we can separate the two species py lades and bathyllus, 

 the latter not having a costal fold in the male. It seems 

 rather odd to put two species so closely related in separate 

 genera, as they are much nearer each other than pylades is 

 to lycidas or drusms, the latter also being placed in Cocceius 

 by Godman and Salvin. Dr. Herman Strecker in his Cata- 

 logue did not even consider pylades and bathyllus different 

 species. We badly need anatomical studies in the Lepidop- 

 tera but the value of the costal fold as a generic character is 

 extremely problematical as it is common in many species of 

 the old genus Eiidamus and is also found in Nisimiades and 

 Pholisora and many other genera in the family Hesperidce, 

 It is folly to use even anatomical characters to form genera 

 when the significance of these characters is entirely unknown 

 and related and unrelated species associated together by a 

 single secondary sexual character. 



Eudanms (Thorybes) bathyllus Sm. -Abbot, pi. 22, 1797. 



"Expanse of wings, 1.4 to 1.5 inches. Upper surface dark brown, 

 about the same color as E. pylades with the spots enlarged. The spots 

 in the middle of the costa of the fore wings are connected with one in 

 the cell that extends from the sub-costal to the median vein, hour- 

 glass shaped, sometimes separated in the middle into two triangular 

 spots. These are in line with two of the three spots below, forming a 

 triangle, the one in the second median interspace and the one below 

 the lower branch of the median, the spot in the first median interspace 

 and the one below the lower branch of the median, the spot in the 

 first median interspace being outside the line. The middle one of 

 these last three spots is as large as the one in the cell, but is not so 

 much constricted in the middle ; the upper is next in size, and the 

 lower one is small. The anteapical series consists of three quadrate. 



