1873.] "J-l [Horn. 



AxAPLEUS, n. g. 



Form broadly oval, convex. Head small, retracted, front slightly con- 

 cave, clypeus not distinct. Antennae frontal, inserted above tbe base of 

 the mandibles, first joint modeuately long, second half the length of the 

 first, joints 3-7 small, snb-globular, equal, club suddenly formed, elon- 

 gate oval, distinctly annulate. Antennal fossa in the middle of the under 

 side of prothorax, broadly open, pectoral plate incised. Thorax without 

 marginal stria. Scutellum very small, triangular. Elytra acutely mar- 

 gined. Abdomen invisible from above. Pygidium vertical or feebly 

 indexed. Presternum broad, bistriate, apex feebly emarginate, lobe 

 short sub-truncate, Mesosternum feebly prominent in front. Anterior 

 tibiae slightly arcuate, feebly dilated, middle and hind tibiae slender. 

 Tibial spurs minute. 



From the insertion of the antennae, this genus must be placed near 

 BendropMlus from which it differs by its slender middle and hind tibise. 

 its shorter prosternal lobe, the mesosternum rounded in front, and 

 many other points. From Bacanius it differs notably in the presence of 

 scutellum, and from Sphaerosoma, in which the species has been placed 

 by the form of the antennal cavity and the form of the antenna} them- 

 selves. 



A. marginatus, Lee. Proc. Acad., 18o3, p. 292. 



Broadly oval, regularly convex, piceous, subopaque. Head coarsely 

 punctured, front concave. Thorax coarsely and rather densely punc- 

 tured especially at base. Elytra coarsely punctured much less densely 

 and more coarsely than the thorax, margin acute slightly redexed, and 

 continuous with the thoracic margin, di.se with traces of the third dorsal 

 stria at base. Propygidium short, invisible from above sparsely punc- 

 tured, pygidium vertical more sparsely punctulate. Epipleural margin 

 of elytra broad with a fine, entire line at middle. Prosternum as broad 

 as long, on each side striate, surface moderately convex coarsely, but 

 very sparsely punctured, lobe short sub-truncate at apex. Mesosternum 

 broad, anteriorly rounded, surface very sparsely punctured and without 

 strise. Anterior tibite slightly arcuate, slender at base and feebly dilated 

 toward the middle, and less dilated at apex, outer margin simple, middle 

 and hind tibiae slender. Spurs of anterior tibiae minute, of middle and 

 hind tibiae not visible, perhaps wanting. Length .06 inch ; 1.5 mm. 



The appearance of this insect is that of Tribalus. As in Dendrophilus 

 the under side of the prothorax is entirely excavated and receive not 

 only the antennae, but also the femur and tibiee in repose. 



Occurs in Illinois and District of Columbia (Like). 



Sub-tribe, Saprini. 



The genera of this tribe are fewer in number thaii the preceding and 

 more readily distinguished. 



