316 GEO. H. HORN, M. D. 



here from the margined base of the thorax. It seems to me more 

 closely allied to Pallodes than any other in our fauna, the large 

 scutellum and the form of the basal margin of the thorax indicating 

 this alliance very plainly. 



P. histrina Lee. — Broadly oval, robust, black, shining, glabrous. Head 

 coarsely punctured. Thorax more than twice as wide as long, narrowed in 

 front, apex emarginate, base arcuate with a short broad lobe at middle and 

 slightly sinuate each side, sides regularly arcuate following the curve of the 

 elytra, margin narrow, disc convex not densely punctured, punctures of moder- 

 ate size with a group of larger punctures forming an arcuate series near the 

 apex. Scutellum moderately densely punctured. Elytra as broad as long, 

 sides regularly arcuate, apex rotundate-truncate, surface with ten rows of 

 moderately coarse punctures, intervals slightly convex, irregularly sparsely 

 punctulate. Body beneath sparsely coarsely punctate. Length .20 inch ; 5 mm. 

 (PL III, fig. 14). 



The resemblance of this insect to a Histeride is so complete that it 

 is always placed among them by inexperienced observers. 



The anterior tibiae are simple except the apical prolongation, but 

 when viewed by transmitted light they appear to be finely crenulate. 

 The tarsi are more dilated in the male than in the female, but in both 

 sexes the posterior tarsi are slender. 



Occurs in Pennsylvania, Georgia and Missouri, but rare. 



P. nigripeiinis Lee. — Bright rufous, elytra above black. Agrees with the 

 preceding in form and sculpture except as follows ; Thorax more sparsely and 

 less coarsely punctured, punctures similar without the arcuate group of coarser 

 punctures. Striae of elytra less deep, punctures smaller, intervals scarcely con- 

 vex. Body beneath more sparsely punctate. Length .18 inch; 4.5 mm. 



The outer apical angles of the tibiae are prolonged into longer 

 processes than in histrina. (PI. Ill, fig. 14, a, b, c.) 



I feel very uncertain regarding the status of this species, as I believe 

 that more specimens will show that it is merely a variety of histrina^ yet 

 as the subject now presents itself they certainly cannot be united. 



One specimen, Pennsylvania. 



AMPHICROSSrS Erichs. 



Labrum bilobed. Mandibles bidentate at tip. Antennal grooves 

 slightly convergent, subocular. Prosternum prolonged at tip, slightly 

 laminiform, anteriorly more or less carinate. Mesosternum prominent. 

 Tibiae simple. Anterior tarsi distinctly dilated, middle feebly, the 

 posterior nearly simple. Claws not toothed. 



The males have an additional segment, visible only beneath, and on 

 the elytra near the middle of the suture a small brush of stiff erect 

 hairs resembling a spine. 



