122 [J"ne, 



Acetabnlca of middle cosee not extending to epimcra... genus Crtptohtpntts, Esch. 



Acetabiila of middle coxfe extending to epimera „ IIypnoidus, Steph. 



Genus Crtptohtpnus, Esoli. 



A. Pronotuni punetidalc and glossy, never granulate or rugulose. 



a. AuteiiufB longer than luilf the hodj ; elytra uiiicolorons, bhieli. 



1. marilimii.i, Curtis. 



a'. Antenna* shorten- than half the body ; elytra usually having four yellow 

 spots 2. (jiiiidrlpnfituJalttSjJf'ah. 



B. Pi'onotnm rugulose or granulate, in greater ]iart dull. 



b. Pronotuni as broad at least as long, less strongly granulate behind than 



in front 3. dennexfou/es, Fab. 



h'. Pronotuni longer than broad ; vvhollj' rugulose exeopt sometimes along 

 ft median raised line. 



c. Size smaller ; hind angles of pronotuin more or less distinctly 

 divergent 4. piiJchellus,Jj. 



c . Size larger ; hind angles of pronotuni convergent... 5. sahulicola, Boh. 



Genus Hypnoidus, Steph. 

 Only one British species known 1. riparins. Fab. 



I have omitted G. oneridionoJis, Lap., from the above list, since its 

 record as a British species (Eiit. Mo. Ma<r., 1898, p. 207) is dependent 

 on a single specimen taken at Pegwell Bay, which, as Mr. Champion 

 sugo;ested, may have beeii accidentally introduced. It is to be 

 noticed also that I treat C. sahiilicola, Boh., as a species distinct from 

 puIcJiellufi, Linn., notvt'ithstanding that M. H. du Buysson (Panne 

 Gallo-Rhenane, Elaterides, p. 23t!) and Herr Reitter (Cat. Col. 

 Europ£e, &c., 2n(l edit.) consider them to be the same, believinj^ 

 ap])arently that snhuIieoJa was founded upon female examples of 

 pulchenus. Until an opportunity was afforded me of seeing and 

 examining a series of those specimens of sahulicoln that were taken 

 by Dr. Sharp at Thornhill in Dumfriesshire {vide Ent. Mo. Mag. 

 18GS, p. 100) I had accepted M. du Buysson's vi(!\v, and had arranged 

 the British Museum specimens accordingly. I found, however, that 

 the distinguishing characters for sahnlicola given by Thomson and 

 Sharp are as clearly marked in the male as in the female ; all the 

 specimens agree in having the hind angles of the pronotum slightly 

 convergent. Through the kindness of Mr. J. E. Black and Prof. 

 T. Hudson Beare I have seen several of the specimens of C'.pulchenus 

 taken by them in Inverness-shire (vide Ent. Mo. Mag., 100(5, p. 155). 

 These specimens, which undoubtedly belong to the true C. piilcJicJhis, 

 Linn., are distinctly smaller on the average than those of sahulicoln, 

 and in all of them the hind angles of the pronotum are divergent. 

 The difference in the shape of the hind angles of the ]ironotum 

 appears to me, therefore, to be not sexual but s|)ecific. There is 

 certainly no sexual difference in the form uf the bind angles in 



