Ceylon Coleoptera, Sfc. 



33 



insects. S. pselaphoides in the former and S. advolans in the 

 present group form connecting links between the two, espe- 

 cially S. pselaphoides, which in general appearance rather 

 belongs to the second, upon closer examination, however is 

 easily ascertained to be an anomalous member of the former. 

 From the rounded or narrowed occiput I have divided the 

 second group into two subdivisions, giving 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. 36) 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 ; antennas, sub approximate at 

 the base ; posterior trochanters elongated, incrassated at the 

 apex ; thorax obovate ; body elongate, subdepressed* 



a.) Mesosternal coirina slight, simple. 



24. ScYDaoENUS alatus, N. 



S. dilute brunneus, pedibus antennisque dilutioribus, tarsis palpisque 

 testaceis ; pubescens ; Long. corp. § lin. 



Antenna? art. 1° apice bi-acuminato, 3-4 subsequalibus, 5 praecedente 

 majore, 6 longitudine inter 4 et 5, ovato, 7-8 subsequalibus, 9 majore, 

 7-9 apice angustatis, tubiformihus, 10-11 ovatis, clavam formantibus, vel 

 art. 9 globoso, 9-11 clavam formantibus. Palpi maxill. art. ultimo 

 minimo apice truncato. Mandibulse dente bifido munitse, basi fortiter 

 abrupteque dilatatse. Thorax foyeis basalibus nullis. Pedes elongati. 

 1857, JT 



