414 TERTIAEY INSECTS OF NORTH AMERICA. 



veins ; a broad band crossing the base of the abdomen and including the 

 hemelytra of a reddish fuscous color. 



Length of body, 8.5°""; breadth of thorax, 3°""; breadth of middle of 

 abdomen, 3.6°"". 



Florissant. Four specimens, Nos. 4480, 11223, 11234, 12085. 



3. PHTHINOCORIS gen. nov. (^9zV®, ^cpt?). 



This genus agrees closely with the last except that the thorax is much 

 longer, the head being distinctly shorter than it. It is of a similar robust 

 form. The head is similarly shaped and well rounded ; the eyes are large, 

 the ocelli small and circular, as near together as to the eyes and opposite 

 the middle of the same. The antennae are scarcely half as long as the 

 body, the basal joint moderately stout but short, not half so long as the 

 head, the other joints subequal, but the fourth the smallest and scarcely 

 incrassated. Thorax fully twice as broad as the head, tapering forward 

 with i-ounded ampliated sides, more or less distinctly separated into an 

 anterior and posterior lobe (the anterior very short) by a transverse slight 

 sulcation, sometimes marked by a series of granules. Hemelytra with 

 the same structure as to the venation as in Achrestocoi'is, the central 

 cell remarkably short, its apex being scarcely beyond the center of the 

 corium ; membrane slightly exceeding the abdomen ; this latter shaped as 

 in Achrestocoris. 



Four species are known. 



Table of the species of Phthinocoris. 



Head much shorter than thorax ; species of medium size. 



Thorax almost twice as broad at base as long 1. P. colligatus. 



Thorax much less thiin twice as broad at base as long 2. P. lethargicus. 



Head and thorax of subequal length. 



Species of small size (measuring about C.S™"" in length); head not broader than long, delicately 



granulate 3. P. laiiijuidu^i. 



Species of large size (measuring about 9.5"™ in length); head broader than long, coarsely and 

 obscurely granulate ..4. P.petrceus. 



1. Phthinocoris COLLIGATOS. 



PL 22, Fig. 3. 



Head imperfectly preserved but plainly triangular, the surface nearly 

 smooth, but beset with a fine granulation. Thorax nearly twice as long as 

 the head, not quite twice as broad as long, the sides nearly straight and 



