20») J. B. SMITH. 



but in a very large proportion of the species narrow, ovate or reni- 

 form. 



Lederer in his Nbctuinen Europas does not seem to be quite consist- 

 ent in the value given to this as well as several other characters, and 

 under the generic term Heliothls he grouped species with both narrow 

 and round eyes. 



The species ononis is a true He/iofhis in all but the eyes, and these 

 are decidedly narrowed and ovate, and by the use of this character two 

 exceeding closely allied species are separated ; still it was an absolute 

 necessity if this peculiarity has a generic value, and reflection convinced 

 me that it deserves to be so considered. The character is evident, and I 

 have not seen any specimen as yet in which the question was but for an 

 instant doubtful in my mind, whether it had ovate or round eyes. The 

 clypeus and its modifications next required attention, and the greatest 

 possible diversity of clypeal structure occurs in this group. 



While not prepared to reject the character entirely, I was inclined to 

 give it but small value, inasmuch as in Oharicleu (as that term is used 

 by Lederer) there are some species with and others with no clypeal modi- 

 fication. I observed however that in this group there are practically but 

 two main kinds of modification, and the others were modifications of 

 them. Except in one instance, so far as I now recollect, clypeal struc- 

 ture alone has not been relied upon to separate genera ; that instance is 

 Heliolonche which differs from Mellcliptriu only in the flattened shelf- 

 like projection of the front. This I retained as distinct, giving the modi- 

 fication thus far a generic value. 



The tongue does not vary enough to make discussion of the value of 

 its modifications profitable. The palpi have an almost uniform pattern 

 throughout, and the antennae do not afford a base even for oroupin»' the 

 species. 



The thorax affords but one character, and that is in the nature of its 

 vestiture. I have here given its variations a generic value, separating 

 species with hairy vestiture from those which have it scaly or mixed. 

 Charlciea is the only genus in which the thoracic vestiture is formed 

 into tufts, and that genus differs in that respect from all others here 

 treated of. 



The neuration of the primaries in this group affords little of generic 

 value. The venation is remarkably constant, as shown in Plate VII, fig. 

 4ti. In Pippona the accessory cell is wanting, and this peculiarity of 

 venation would sustain the genus even did it have no other peculiarities 

 (if structure. 



