174 ADEPHAGA. [_IIijdropQrus. 



a. Head without oblique stripes, dark at base 

 and near eyes ; thorax with two dark trans- 

 verse patches ou disc, separated (as a rule) 



iu centre H. septenteionalis, Gi/ll. 



b. Head with an oblique stripe on each side 

 forming a Vj thorax with two strong 



black transverse impressions at base , . , H. Davisii, Curt. 

 II. Thorax without longitudinal impressions. 



i. Thorax testaceous with two black spots divided 



by a central line H. halensis, F. 



ii. Thorax dark with at most sides lighter. 



1. Lateral border of thorax viewed sideways form- 

 ing a plain, though obtuse, angle with the 

 borders of the elytra. 



A. Base of thorax widely impressed at sides . . H. doesalis, F. 



B. Base of thorax not impressed towards sides. 



a. Underside red, elytra with more or less 



distinct black lines H. lineatus, F. 



b. Underside black or brown, elytra without 



trace of black lines, 

 a*. Size very small (L. 2-2| mm.). 



af. Thorax yellowish red, elytra reddish 



brown H. ScALESlANUS, Siep/i. 



bf. 'Ihorax black, elytra black or brown, 

 aj. Thorax with base narrower than 

 base of elytra ; sides narrowly mar- 

 gined H. NEGLECTTJS, SchatlDi. 



bj. Thorax with base as broad as base 



of elytra; sides not margined . . H. UMBEOSUS, Gi/ll. 

 h*. Size larger (L. 2|-4 mm.). 



af . Sides of thorax not, or very indis- 

 tinctly margined, 

 aj. Thorax impunctate on disc, elytra 



without spots H. ANGXJSTATUS, Slumi. 



bj. Thoraxentirely punctured; elytra 

 with more or less distinct lighter 



markings. 

 *. Head more or less red; thorax 

 with margins broadly yellow 



or red yellow. 

 +. Form oval ; punctuation very 



fine; length 4i mm H. maeoinatus, Dufl.. 



tf. Form oblong ; punctuation 

 coarser ; length 3-3^ mm. 

 X- Form narrower; pubes- 

 cence thicker . . . . H. paltjsteis, L. 

 XX- Form broader ; pubes- 

 cence more scanty . . . H. INCOGNITUS, Sharp. 

 **. Head dark, elytral markings 

 very indistinct, sometimes 

 almost obsolete; thorax uni- 



colorous H. viTTULA, Er. 



\y\. Sides of thorax distinctly (although 

 sometimes finely) margined, 

 a J. Larger species, oblong and parallel- 

 sided (L. 4 mm.). 

 *. Elytra and thorax ferruginous 



with suliused lighter markings H. feeeugineus, <S'it*/>A. 



