174 NORTHERN ZOOLOGY. 



xxi. * Subgenus Tetropium. Kirb. 



Eyes four, connected by an elevated line. 1 



Antenna robust, short : scape much incrassated, subcylindrical, remaining joints subclavated. 



Prothorax constricted anteriorly and posteriorly. 



Thighs much incrassated, sometimes clubbed. 



The type of this subgenus is Callidium triste Fabr. for those with clavated 

 thighs, and C. aulicum* for those in which they are incrassated nearly their whole 

 length. These insects will be found to have four distinct eyes, separated by the 

 substance of the head elevated into a ridge, which at first sight appears a continu- 

 ation of the eye, but which evidently has no lenses implanted in it — they are also 

 distinguished by their robust and short antennae. 



(231) 7. Callidium (Tetropium) cinnamopterum. Cinnamon-winged 



C. Tetropium. 



C. T. f cinnamopterum J atrum, pilosum ; antennis, pedibus, pectoris lateribus, elytrisque rufis ; femoribus incrassatis ; haud clavatis. 

 Cinnamon-winged C. Tetropium, very black, hairy; antenna, legs, sides of the breast, and elytra rufous : thighs incrassated 

 but not clubbed. 



PLATE V, FIG. 8. 

 Length of the body 3| — 6 lines. 



Several specimens taken in Lat. 65°. 



DESCRIPTION. 



At first sight this species seems the exact counterpart of Callidium triste, which it resembles in 

 almost every respect ; but upon examination it will be found that the thighs of these two insects are 

 of a very different shape, those of C. T. triste being much attenuated at the base, while those of 

 C. T. cinnamopterum are not at all. In the latter also the sides of the fore-breast are red, and the 

 elytra are considerably darker, very near the colour of cinnamon. 



The American specimens vary much in size, but all agree in the shape of the thighs. 



i Plate V, Fig. 8, a. 



