332 PROCEEDESrGS OF THE NATIONAL MUSEUM vol. no 



abdominale Smith, A. centrale Fall, and A. perforicolle, are very 

 similar but occur in widely separated localities. 



A. rufipenne Gjdlenhal and A. evustum, new species, are distinct 

 with their red elytra. The other species are black. A. gulare Fall 

 is distinct in that the ventral surface of the head is deeply excavated 

 and polished and the antennae are inserted far front on the beak. 

 Apion porcatum is a large species with narrow, strongly convex 

 elytra! intervals, and the antenna! club is rather small, being shorter 

 than segments 5 through 8 of the antenna! funicle. The elytral inter- 

 vals of the other species are nearly twice as wide as the striae (except 

 in abdominale) and are flatter and the antennal club is about as long as 

 segments 3 through 8 of the antennal funicle. The mucrones of 

 A. perforicolle are rather short and subangulate, the elytral intervals 

 are twice as wide as the striae, the beak is strongly dilated laterally 

 over the antennal insertion and in comparison with A. centrale the 

 prothorax is nearlj^ parallel in the basal half and not constricted 

 apicaH.y, and the interspaces on the dorsal surface of the prothorax 

 are about equal to the diameter of the punctures and are slightly 

 shining and strongly alutaceous. The mucrones of A. patruele, A. 

 abdominale, and A. centrale are dentate and the sides of the pro- 

 thorax of the latter are sinuate before the base (the basal lateral ex- 

 pansion is m.ore pronounced) and constricted apically; the dorsal 

 surface of the prothorax is closely punctured; and the interspaces are 

 about one-half the diameter of the punctures, polished and very 

 finely alutaceous. The beak of A. patruele is not expanded laterally 

 at the antenna insertion; the abdomen and metasternum are rather 

 finely, sparsely punctured; and the elytral intervals are somewhat 

 convex. The beak of A. centrale and A. abdominale is strongly 

 expanded laterally at the antennal insertion; the abdomen and meta- 

 sternum, are coarsety, closely, and deeply punctured; and the elytral 

 intervals are flatter. The intervals of A. centrale are nearly twice 

 as wide as the striae and slightly wider at the middle than at the base 

 and the mucrones of the male are short and strongly angulate. The 

 intervals of A. abdominale are nar^ov^^er and are slightly wider than 

 the striae and are especially narrow basally and the mucrones are 

 moderately long and slender. A. fusconitidum Wagner is distinct 

 with its large, robust form; narrow, convex intervals; and irregularly 

 punctured dorsal surface of the prothorax. 



The name Apion patruele Smith has been selected arbitrarily as 

 the one to be used to designate the section of Trichapion Wagner 

 that is coordinate \vith the Apion simile section. As yet no member 

 of the A. patruele section is known to be holarctic in distribution. 



The differentiation of the groups of the A. patruele section with 

 respect to the A. patruele group is as follows. The A. reconditum 



