TACITTNITS. 237 



iiiiddle lohc shortest, obtusely pointed. L. 3 — ?>l 1. Com- 

 mon, T. h'lcmeralis, Gr. 



JB J?. Secoud and third joints of antennae 

 blackish at apex. 



Similar to T. humeirdis, but with posterior margin of 

 thorax scarcely bordered with brown ; elytra with a dark 

 brown shade, except a larger or smaller triangular space 

 round scutellum ; antennae a little shorter and punctuation 

 finer. Male with penultimate dorsal segment of abdomen 

 less produced ; middle lobe of same segment in female 

 more narrowly pointed. L. 3 1. Not common. 



T. 2}roximus, Kr. 



2. Anterior margin of thorax not paler than disc ; 

 elytra about half as long again as thorax or less. 



A A. Apical margin of elytra pale. 



a a. First joint of antennae blackish. 



Black ; elytra chestnut-brown, with a more or less ex- 

 tensive blackish shade (sometimes entirely blackish, except 

 shoulder and apical margin) ; antennae with first three 

 joints pale at base only ; legs red-brown. Elytra more than 

 half as long again as thorax. Penultimate dorsal al)donunal 

 segment of male as in T. humcralis, of female middle lobe 

 gradually sharply pointed, as long as lateral ones. L. 3 1. 

 Not very common. T. flavipes, Fab. 



h b. First joint of antennae pale. 



A a. Thorax entirely black. 



Pitch-black ; shoulders and apical margin of elytra 

 pitch-brown ; base of antennae and legs brown-red. Elytra 

 scarcely half as long again as thorax. Penultimate dorsal 

 segment of abdomen in male produced into four sharp 

 points, central pair much longer, in female trilobed, middle 

 lobe suddenly pointed, rather shorter than lateral ones. L. 

 2i — 2|- 1. Common. T. rufijjcs, De G-. 



li h. Sides of thorax pale. 



A 1. Elytra half as long again as thorax. 



Black ; sides and base of thorax, a small humeral spot 

 and posterior margin on elytra, base of antennae and legs 

 red-brown. Penultimate dorsal abdominal segment of 

 male produced into four slightly rounded points, central 



