238 HYDRoniiLiD.E. [Ilsfvphonis. 



species, but this also is by some authors referred to H. ceneipennis ; the 

 chief varieties to be noticed are the following : — 



Y. planicoUis {H. planicolUs, Thorns.). Eather narrower than the 

 type with the sides more parallel, the elytra being longer in propor- 

 tion to thorax ; the thorax is flatter, and has an evident depression just 

 in front of the middle of the central channel ; the femora are dusky 

 black on the basal half (in the type only faintly darker at the extreme 

 base) ; the punctures in the striae of the elytra are very evidently finer 

 and closer, and the interstices are flatter and a little narrower. 



Apparently not uncommon in the mountainous districts of Scotland and Ireland, 

 but not found hitherto in England ; it occurs as far north as Shetland. 



V. strigifrons {H. sfrir/ifrnnf^, Thorns.). Allied to the preceding 

 variety, and also to the type form ; it is, on the average, a little larger 

 than either ; the elytra are more strongly dilated behind the shoulders, 

 and they have a broad reflexed margin, the space beyond the last stria 

 being hardly, if at all, narrower than the widest interstice ; the sides of 

 the thorax are more regularly rounded ; the longitudinal furrow on the 

 head (which in type ceneijyejims and v. planicollis widens out forwards) 

 is iniiformly narrow ; the internal furrows on the thorax are less angu- 

 lated, and the alternate interstices are elevated ; from v. planicollis it 

 differs in having the pimctures on the elytra much larger and not so 

 close, and the femora almost entirely testaceous. (See Ent. Mo. Mag. 

 xiii. 39, 40 ) 



Apparently not uncommon in Scotland and Ireland, but not recorded from England, 



V. crenatus, Eey. Allied to both the preceding varieties ; it has a 

 less thick-set form than v. strigifrons, and the sides of the thorax more 

 rounded ; from v. planicollis it differs in not having the frontal furrow 

 widened in front, and in having the elytra more strongly crenate-striate 

 than in that species. 



Recorded from England by M. Pandelle, and probably to be found in our collec- 

 tions. 



K. laticollis, Thoms. (Idee, Power). This species, although re- 

 lated to //. ceneipennis, appears to be very distinct ; the thorax is 

 broader, witli sides more regularly rounded, and more convex, Avith the 

 central furrow, and in fact all the thoracic furrows, narrower, shallower, 

 and more even ; the internal pair are not angular, and the outer pair 

 are distinctly parallel to tlie margin ; the elytra are more parallel-sided, 

 of a dark brownish colour, sometimes but not often metallic, with 

 stronger, somewhat crenate stria3, and narrow interstices ; the last joint of 

 the maxillary palpi is stouter, and is usually entirely black (a character 

 which at once distinguishes the species) ; legs brownish testaceous. L. 

 3-4 mm. 



Taken by Dr. Power in some numbers at Woking, but not apparently recorded 

 from any other locality. 



