20 Mr. G. C. Champion on the Heleromerous Coleoptera 



Akrhab-s:us. 



Arrhahseus, Champion, Biol. Centr.-Am., Col., iv., 1, 

 p. 144 (1886). 



Arrlialjivus debills, n. sp. 



Moderately convex, shining, piceous or castaneous, the antennaj 

 ferruginous. Head coarsely punctured, deeply, transversely 

 depressed in front, the sides of the front swollen and moderately 

 prominent. Prothorax strongly transverse, about equal in -width 

 at the base and apex, the sides slightly rounded and sharply 

 margined; coarsely, somewhat closely punctate. Elytra twice the 

 length of the prothorax, arcuately narrowing from about the 

 middle ; coarsely and deeply punctate-sulcate, the interstices 

 convex at the sides, flatter on the disc, and with a few very minute 

 widely scattered punctures. Anterior and intermediate tibice 

 rather coarsely denticulate on their outer edge, the anterior pair 

 widening outwards. 



$ . Head broader, with the sides of the front more dilated, 

 oblique, and extending outwards nearly as far as the eyes. 

 Length 2^-3^, breadth 1-1^ ram. (,??.) 



Hah. St. Yinceut; Grenada — Balthazar, on the 

 Windward side. 



Numerous examples. This species is almost inter- 

 mediate between Arrhahreus, Champ., and Dicedus, Lee. 

 The type of the first-mentioned, ^4. cunvexus, Cbamp., 

 from Costa Rica and Panama, has much stouter and 

 more coarsely denticulate anterior tibiae, and a very 

 differently formed head. These characters, however, 

 become much less marked in A. guadelonpensis, Fleut. 

 and Salic, and the present insect. InDloidiLs the anterior 

 tibia) are rather narrow, and the sides of the front are 

 not swollen. A. dehilis is smaller and less convex 

 than ^4. guadeJoiipensis, and it has the punctuation of the 

 thorax and elytra much coarser. FvovaDioedus pitnctatus, 

 Lee.,, an insect found under pine-bark in North America, 

 it may be known by the prominent sides of the front and 

 the wider anterior tibias. A. guadtloupensis and J. delnlis 

 would, perhaps, be almost equally well-placed in Dioedus. 

 In rotten wood (Smith). 



