1873.] OIL [Horn. 



AXAPLEITS, 11. g. 



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

 cave, clypeus not distinct. AntenniB frontal, inserted above the base of 

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

 first, joints 3-7 small, sub-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 

 m:irginal stria. Scutellum very small, triangular. Elytra acutely mar- 

 gined. Abdomen invisible from above. Pygidium vertical or feebly 

 inflexed. Prostenium broad, bistriate, apex feebly emarginate, lobe 

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

 tibicB slightly arcuate, feebly dilated, middle and hind tibioi slender. 

 Tibial spurs minute. 



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

 Dendropltilus from which it differs by its slender middle and hind tibia!, 

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

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

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

 by the form of the antennal cavity and the form of the antennae 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 reflexed, and 

 continuous with the thoracic margin, disc 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 tine, entire line at middle. Prosternum as broad 

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

 very si^arsely punctured, lobe short sub-truncate at apex. Mesosternum 

 broad, anteriorly rounded, surface very sparsely punctured and without 

 strite. Anterior tibiaj slightly arcuate, slender at base and feebly dilated 

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

 and hind tibiffi slender. Spurs of anterior tibise minute, of middle and 

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



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

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

 only the antennse, but also the femur and tibiae in repose. 



Occurs in Illinois and District of Columbia (Ulke). 



Sub-tribe, Saprini. 



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

 more readily distinguished. 



