270 MEMOIRS ON THE COLEOPTERA 



lary palpi is only one-half longer than the penultimate, the latter 

 being unusually elongate. The last joint of the outer maxillary 

 lobe is moderately long, feebly swollen basally, gradually finely 

 subulate apically. The basal angles of the prothorax are always 

 rounded and generally very broadly; the elytra have a single discal 

 puncture; the lateral line of foveae are widely interrupted and the 

 scutellar stria is variable though usually long and well developed. 

 The abdomen is punctureless and with two terminal setae in the 

 male, or punctured and with four setae in the female as in Acupalpus. 

 The anterior and middle tarsi in the males of some species, such as 

 fuliginosus and spretus are both rather strongly dilated and bi- 

 seriately squamose beneath, the fourth joint strongly bilobed, but 

 in certain other species, such as anceps, the anterior are moderately 

 dilated with two series of large elongate transversely plicate hyaline 

 squamae beneath, while the middle tarsi are slender and not or 

 scarcely modified sexually. At first it seemed that these and some 

 other differences might demand subgeneric division of the genus, 

 but the general habitus of the body, as well as other structural 

 elements, is so constant throughout, that it does not seem possible 

 to divide the genus. Four subgeneric groups might be suggested, 

 however, having as typical species carbonarius , fuliginosus, unicolor 

 and conjunctus. 



The species are numerous; those known to me may be described 

 as follows: 



Pronotum broadly and strongly deplanate or even somewhat reflexed in 

 the vicinity of the hind angles, the latter very broadly rounded. . .2 



Pronotum not deplanate near the hind angles, which are never quite 

 so broadly rounded 3 



2 Form broadly oblong-suboval, rather depressed, deep black, shining, 

 the elytra (9) opaculate; legs blackish-piceous; head barely more 

 than half as wide as the prothorax, the eyes rather large but not very 

 prominent; antennae blackish, with the first joint rufous, very long 

 and slender; prothorax of peculiar form in the genus, not quite one- 

 half wider than long, widest somewhat behind the middle, the sides 

 very broadly and subevenly arcuate; apex rather deeply sinuate, 

 narrower than the base, which is transverse medially, the angles 

 extremely broadly rounded and wholly obliterated; surface finely 

 reflexed at the sides at apex, the gutter flat, rather rapidly increasing 

 in width posteriorly, disappearing in the broad latero-basal flat area, 

 which, in common with the large rounded and rather deep fovese, is 

 very finely and sparsely punctulate and opaculate; stria very fine, 

 not extending anteriorly beyond the obsolete transverse impression; 



