1856.] Entomological Papers. 543 



preference to the distinctions to be drawn from this part of the body 

 to those to be derived from the thorax, which from the variety of 

 shapes it assumes would naturally suggest itself for that purpose, 

 but the gradations between the principal forms appear to me too 

 many, too fine, and therefore too indistinct, to adopt them. As to 

 the third group (B. spec. 42) the insect which alone forms it amongst 

 those described below, is so different from any of the others that 

 its peculiarities must strike any one at first sight. 



A. Species with a thick neck, abruptly formed and immersed in the 



thorax. 

 I. Fourth joint of the maxill. palpi not acuminated ; head sub- 



quadrato-ovate ; eyes middling or small, finely granulated, little 



or not at all prominent ; antennae subapproximate at the base ; 



posterior trochanters elongated at the apex; thorax obovate ; 



body elongate, subdepressed. 

 a.) Mesosternal carina slight, simple. 



30. Scydmcenus alatus. N. 



S. dilute brunneus, pedibus antennisque dilutioribus, tarsis 

 palpisque testaceis ; pubescens ; long. corp. f lin. 



Antennae art. 1° apice biacuminato, 3-4 subsequalibus, 5 prse- 

 cedente majore, 6 longitudine inter 4 et 5, ovato, 7-8 subsequalibus, 

 9 majore, 7-9 apice angustatis, tubiformibus, 10-11 ovatis, clavam 

 formantibus, vel art. 9 globoso, 9-11 clavam formantibus. Paipi 

 maxill. art. ultimo miniino, apice truncato. Mandibular dente bifido 

 munitae, basi fortiter abrupteque dilatatae. Thorax foveis basalibus 

 nullis. Pedes elongati tarsis art. 2-3 subsequalibus. 



I include in this species individuals with a 2- and others with 

 a 3-jointed antennal club. The latter are further distinguished 

 by having a slight sinuosity in the rounded outline of the basal 

 angles of the thorax, by having the posterior part of the metathorax 

 and the base of the abdomen sensibly iucrassated, and the head 

 rather less quadratic than the former. However, the individuals 

 thus distinguished being in all other respects exactly like those 

 with the 2-jointed club, I cannot help looking upon all these dis- 

 tinctions as sexual ones and uniting the insects in the same species. 



