TACHYl'OKUS. 235 



Head black ; elytra reddish-yellow, with spot round 

 scutellum and a streak at side margin blackish. (Joninion. 



T. chrysomelinus, Lin. 



2, Length 1-^ lines. 



A A. Elytra without black line at side. 



Hend black ; elytra pale straw-colour, with a sharply 

 defined black spot round scutellum. Eather common. 



T. pallidus, Sharp. 



B JB. Elytra with a black line at side. 



a a. Elytra nearly half as long again as thorax, 



their ground colour red-yellow. 



Head black, front of mouth yellowish ; elytra red-yellow, 



with a small spot round scutellum and a narrow, rather 



sharply defined streak at side black ; antennae brownish, 



first four joints yellow-red. Not uncommon. T. tcrsus, Er. 



b b. Elytra one-third longer than thorax, 

 their ground colour dark red-brown. 



Head black ; elytra dark red-brown, neighbourhood of 

 scutellum, base and side margin blackish ; antennae da.rk 

 brown, base red-brown. Common. T. hnmerosus, Er. 



II. Thorax Ijlack, with sides lighter. 



1. Elytra darker round scutellum ; antennae red- 

 yellow. 



Thorax with light side margin broader behind and rather 

 sharply defined; elytra yellow-red, with a spot round 

 scutellum and the side margin black ; legs red-yellow, 

 posterior femora often blackish at base. L. If 1. Common. 



T. hypnorum, Fab. 



2, Elytra not darker round scutellum. 



Thorax black, sides (especially behind) rather broadly* 

 base narrowly yellowisli-brown ; elytra brown, side margin 

 (almost to apex) black; legs yellowish-brown, femora 

 darker. L. 1^ 1. Common. T. pusilLus, Gr. 



b. Abdomen chiefiy red-brown or brown. 



I, Thorax with ajjical half black and hinder half red- 

 yellow. 

 Head l)lack, mouth red-yellow ; elytra black, with hinder 

 half or third part red-yellow ; abdomen red-brown, basal 



