112 CHARLES W. LENG. 



species. The labrum is subject to some individual variation and is 

 not always easy to see, and I have not used this character unneces- 

 sarily ; but evidently a marked difference in this character indicates 

 specific diflference. 



The interociUar strice do not present many differences ; they are 

 usually numerous and fine and nearly fill the space between the 

 eyes ; sometimes they are very faint ; sometimes they are few and 

 coarse. In those species which have the front glabrous, these striae 

 are usually prolonged almost to the labrum. 



The thorax is usually narrowei' at base than at apex ; when this is 

 well marked it is called trapezoidal ; when feebly marked or absent, 

 it is called quadrate or subquadrate ; usually the line of demarkation 

 between the dorsal aspect and the flanks is evident, when it is not so 

 the thorax is called cylindrical. The thorax is usually more or less 

 flattened above, and when this is not especially evident, it is called 

 convex. Always three grooves interrupt the upper surface, the 

 anterior and basal which parallel respectively the anterior and 

 basal margins, and the median which runs directly through the 

 median line of the thorax ; but these grooves vary greatly in depth. 



The elytra are more or less flattened, when this is not marked, they 

 are called convex. In the celeripes group they are rounded at the 

 humeri, but otherwise the angle is always distinct; the apices are 

 usually conjointly rounded, sometimes minutely serrulate, sometimes 

 plain. In repanda and Sommeri the serrations are especially evident. 

 In some groups there is a considerable sexual modification of the 

 elytral apex, whereby a piece is cut out of the external margin 

 and a subapical angle is produced. The surface of the elytra is 

 usually even, but a subhumeral depression at the base is more or 

 less evident. 



The outline of the elytra varies, as I have tried to show in the 

 figures. 



The pilosity of the body is quite variable and will be specially 

 mentioned under each species. The hairs on the front between the 

 eyes are especially useful. 



The punctuation, especially of the elytra, is very useful and seems 

 constant. 



" Impunctate" is the term applied to the scutellaris group, altliough 

 in some southern races a fine punctulation is visible. " Simply punc- 

 tate" means without elevated granules beside each puncture. " Granu- 



