648 Goleopterological Notices, VII. 



motely punctate, inflexed and greatly dilated at tip for scarcely % the distance 

 to the middle, the excavation moderately deep, punctured and rather abruptly 

 defined at its arcuate posterior and interior limit, but shallow, indefinite and 

 smooth anteriorly to the apical edge; post-median depression strong, transverse 

 and smooth ; disk impunctate, evenly, transversely convex, the median groove 

 fine and feeble. Scutellum punctate, with an impunctate median line. Elytra 

 parallel, not swollen behind, % longer than wide, 2% times as long as the pro- 

 thorax, finely striate, more coarsely on the vertical flanks, where also the punc- 

 tures become more distinct and the intervals distinctly narrower and more 

 convex. Pro- and mesosterna opaque, the metasternum polished but punctu- 

 late and pubescent broadly at the sides throughout, with numerous coarse 

 punctures along the hind margin. Tibise densely pubescent externally, with- 

 out trace of external spines. Length* 39.5 mm.; length of prothorax 9.5, 

 ■width 12.5; length of elytra 21.0, width 13.0 mm. Honduras. 



This remarkable species is evidently somewhat related to 

 hageni Kaup, but differs in its stouter form and in having the 

 end tubercles of the transversely arcuate frontal ridge perfectly 

 and abruptly isolated laterally, and not connected with the supra- 

 orbital ridge by a transverse elevation. From cavicollis of Bates, 

 to which it is very closely allied, it appears to differ in its still 

 larger labral excavation, shorter transverse frontal ridge and 

 shorter and more transverse joints of the antennal club. Mr. 

 Bates states with regard to cavicollis " metasterno puuctulato-pu- 

 bescenti, medio solum glabro;" in the present species the pubes- 

 cent and punctured surface is confined to the sides, broadly an- 

 teriorly but not extending inward beyond the depressed side-piece 

 posteriorly. 



Note. — For several years past I have had two series of examples separated 

 under the name cornutus Fabr., the series differing from each other quite con- 

 spicuously in size and in the structure of the cephalic process. From all that I 

 have been able to gather, the smaller form occurs more especially on the eastern 

 slopes of the Appalachian system, while the larger occurs generally to the west- 

 ward, although there is without doubt a mixture of the two in the intervening 

 regions. The eastern form, which may be regarded as the true cornutus, has the 

 cephalic process somewhat variable but small, thickened at base and cylindri- 

 cally pointed at its porrect apex, while the western form not only has the body 

 larger and slightly more elongate, but the horn much larger, with the porrect 

 portion flattened and the transverse section near base more angulate at the 

 sides. Although there are absolutely no other differential features of note, it 

 seems necessary to consider these larger western forms, with more developed 

 corneous process, as at least a well-marked subspecies, which may be known 

 as distinctus Weber. 



*The measurements of length include the mandibles in all the above de- 

 scriptions. 



