100 GEO. H. HORN, M. D. 



species), meetiag the mesosternum, the anterior coxoe prominent. 

 Mesosternum horizontal in front, very narrowly separating the middle 

 coxae. Posterior coxa) suddenly dilated within forming an oval plate 

 and contiguous at their inner margin. Legs moderate, tibiae flattened 

 on' their outer edge and with distinct terminal spurs. Tarsi flattened 

 above, first joint as long as the next three, 2 — 3 — 4 subequal, the 

 latter broader and subbilobcd, fifth moderate, the claws simple. 



The affinities of this genus have already been sufiiciently alluded to 

 in the synoptic table. 



Prosternum at tip remaining a vertical lamina the same as between the coxse. 

 (PI. I, fig. 11 b). 



Males with joints 4 — 10 of antennoe bi-appendiculate discoideus. 



Prosternum at tip dilated in the form of a spear-head. (PI. I, fig. 11 a). 



Males with simple antennae limbatus. 



1". discoideus Say. — Oval, slightly oblong, moderately convex, yellow, 

 elytra with large discal black space of variable size, divided by the suture. 

 Head sparsely punctate. Thorax short, transverse, very little narrowed in 

 front, sides feebly arcuate, margin not explanate, apex and base bisinuate, disc 

 moderately convex, sparsely punctulate. Elytra coarsely moderately densely 

 punctate. Body beneath rather sparsely punctate. Length .12 — .20 inch; 

 3 — 5 mm. 



The males have two branches (not articulated), arising from the 

 base of joints 4 — 10, these appendages rather longer than the joint 

 and fimbriate. The females are larger and broader and have simple 

 antennae. In both sexes the antennae are yellow. (Pi. I, fig. 12). 



Occurs from Pennsylvania to Missouri and Georgia. 



P. liuibatus Lee. — This species in its form and superficial details resem- 

 bles the preceding. It differs however in the male having simple antennae, 

 and in both sexes by the structure of the tip of the prosternum. The antennse 

 are black or piceous except the three basal joints. Length .15 — .20 inch; 

 4 — 5 mm. 



In discoideus the tip of the prosternum is a simple vertical lamina 

 received in a narrow notch of the mesosternum. In this species the 

 tip is dilated in the form of a narrow spear-head and lies upon the 

 mesosternum. 



Occurs from Pennsylvania to Georgia. 



MICROC'ARA Thorns. 

 Head strongly deflexed, a well defined subocular carina, under side 

 of head slightly concave. Antennae a little longer than half the body, 

 slender, filiform, first joint oval, second shorter, conical, third a little 

 longer than second, 4 — 10 gradually but very feebly shorter, eleventh 

 longer than the tenth. Labrum transverse. Front without suture. 



