LIBYTHEINAE: THE GENUS IIYPATUS. 753 



That this group of butterflies is a waning type appears perhaps further 

 from the fact that a fossil has been discovered in Colorado belonging here, 

 and combining in its structure features which distinguish the genera of the 

 Old W'orld and the New. That of the paltry number of fossil butterflies 

 known, one should belong in a group so inconspicuous in numbers in 

 modern times as this, is a very striking fact. 



HYPATUS HUBNER (restr.). 



Hypatus Httbn., Catal. Franck, 85 (1825). Libythea (pars) Auct. 



Type.—PapUio earinenta Cram. 



"Whose butterfly," I said, "are you? 

 And what sweet thing do you pursue?" 



Stodd Ann. — The floicer of love lies bleeding. 



Imago (54 : 6). Head of moderate size, abundantly clothed Avith short, compact hairs. 

 Front moderately full, broadly rounded, scarcely protuberant beneath, advanced slightly 

 in front of the eyes, considerably broader than high, but not so broad as the eyes ; upper 

 border descending a little but rather suddenly with rounded edge to the antennal pits, 

 in the middle advanced very broadly, without descending, between the antennae, 

 Avhere it is well rounded transversely ; lower border broadly rounded. Vertex very 

 low but slightly tumid, nearly or quite twice as broad as long, its sides a little raised 

 and straight, its posterior border very slightly concave ; its anterior border not descend- 

 ing. Eyes rather large and full, naked. Antennae inserted slightly in advance of the 

 middle of the front, in perfectly distinct, shallow pits, their interior bases separated 

 by the width of the base of the antennae and their outer crowded against the eyes ; 

 considerably longer than the abdomen and composed of about forty-two joints, of 

 which the last twelve to sixteen form a very gradually incrassated, elongated club, 

 which is cylindrical, rather strongly compressed, two and a half times broader than 

 the stalk and four or five times longer than broad, the last four joints included in the 

 diminution of size, the apex being rather rapidly rounded and the apical joint conical, 

 the minute tip slightly produced; beneath furnished with three rather distant, dis- 

 tinct carinae, Avhich extend upon the stalk. Palpi exceedingly long, tapering, and, 

 at least the apical half, rather slender, fully four times as long as the eye and directed 

 forward in the plane of the body, the apical joint twice as long as the penultimate and 

 clothed, besides the ordinary covering, with a few scaly hairs beneath, Avhile the 

 other joints are heavily furnished with long, suberect scales, particularly on the upper 

 and under surface and beneath, with a fringe of long hairs. 



Prothoracic lobes consisting of very small, uniformly appressed laminae about two 

 and a half times broader than high. Patagia almost flat, moderately broad and rather 

 Ion"-, scarcely three times as long as broad, the posterior portion (a little more than 

 one^third) bent downward, rather slender, rounded at tip, the inner margin being 

 broadly and rather regularly rounded, the outer margin bent rather abruptly. 



Fore wings (43 : 5) more than half as long again as broad, the costal border regularly 

 and broadly arched, terminating abruptly and angulated at the apex. Outer border of 

 an irregular shape; just below the apex it is directed backward at a little more than a 

 ri"-ht angle ; when it has passed the lower subcostal nervule it is suddenly bent directly 

 toward tlie base at less than a right angle with the previous portion, forming over the 

 subcostal area a large, broad, triangular, bluntly pointed tooth; the rest of the border 

 is nearly straight, a little crenulate and directed toward the apex of the wing ; the 

 lower angle is well rounded and the inner margin is straight. First superior subcostal 

 nervule arising just before the middle of the outer half of the upper margin of the 



9S 



