382 TERTIAEY INSECTS OF NORTH AMERICA. 



narrowed apex of the thorax, which is broadest at extreme base, or close to 

 it, much broader than long, and tapers forward with greater or less rapidity 

 and regularity. The hemelytra have the outer extremity of the cerium 

 reaching not far beyond the middle of the abdomen, and the legs are very 

 much as in Crophius. The antenna? are at most only a little more than a 

 third as long as the body, the first joint short and not surpassing the head, 

 the rest slender and nearly cylindrical, the second the longest, the third and 

 fourth equal in length, but the last slightly incrassated. 



Three species occur at Florissant, one of them in great abundance. 



Table of the species of Procrophiiis. 



Hemelytra with no distinct series of punctures. 



Hemelytra uniformly or almost uniformly obscure 1. P. communis. 



Hemelytra clear with a broad costal thickening 2. P. contalis. 



Hemelytra with distinct series of punctures following the main veins 3. P. languens. 



1. PKOCROPHIUS COMMUNIS. 



PI. 23. Figs. 12, 18, 28, 29 ; PI. 24, Fig. 1. 



The antennae of this species are much stouter than in the next, and 

 aiso relatively shorter. The head is more than half as long as the thorax, 

 or a little more than that, very bluntly angled in front ; thorax about as 

 long as the anterior breadth, at least half as broad again posteriorly, taper- 

 ing with great uniformity so as to show but little curvature to the sides, the 

 surface nearly smooth, entirely without constriction next the base. Heme- 

 lytra dark and obscure, occasionally with obscure lighter patches below the 

 costal field and next the middle of the membranal suture ; membrane clear. 



This is one of the commonest species of Lygaeidoo at Florissant 



Length of body, 3.5 nmi ; breadth, 1.5 mm ; length of corium, 1.5""". 



Florissant, Twenty specimens, Nos. 193, 258, 1209, 1404, 1570, 2388, 

 4313, 4577, 4602, 5722, 5832, G205, 6246, 6873, 7330, 11184, 11222, 11652, 

 12061, 12458. 



2. PROCROPHIUS COSTALIS. 



Pi. 23, Fig. 8. 



This species differs from the preceding in the slenderer antennae, the 

 more rounded sides of the pronotum, and the character of the slightly rela- 

 tively longer hemelytra. The thorax is rather stouter than in P. communis, 

 being nearly twice as broad as long, with gently rounded sides, which at 



