British Species of HixVu^lus. Ill) 



0. //. ficyihni, Wfliiicko. 



M\- acqnaiiitaiice wiih this species lia-*, until tliis year, 

 been soinewliat limited, ami, until I took speciuiens in the 

 New Fonst (Hants S.) and in Ciimbiidge, I had never 

 seen it in the Held, althou<rli I hail seen a few s[)ecinien3 tVoni 

 the collections ot" various friends. It is apparently a pond- 

 species like //. ruficoUis, but it is more localized in our islands. 

 I have seen specimens from Lanes S. and Chester, and ther(i 

 is a Leicester record, but otherwise all records are for south 

 (if a line drawn from the AVash to Hereford — Gloucester E., 

 Oxford, Berks, Middlesex, Surrey, Kent W., ? Sussex E., 

 Hants vS., \. of Wight, Dorset, Devon N. and S., Cambs, 

 an.l Norfolk E. 



The species, in general appearance, is easily mistaken for 

 a small rujicollis, but in the cJ the equal ant. tarsal claws 

 and the form of the nedeagus at once separate it. Apparently 

 the ? usually has the elytra without fine puncturation or 

 with only the apex thus marked, but there are many small 

 females which are completely punctate which may or may 

 not be this species. 



General Snmmary of Characters. — 



( \. General form : small, most likely to be mistaken for small 



I rujicollis, but usually sli^-'Ltly wider in proportion to Iei)j.nh. 



A.<^ 2. Tborax much as in II . n/Jico/liH, but with sides almost straight. 



I 3. Thoracic striae as in //. rujicollis. 



[_4. Llytra as in II. rujicullis. 



, ) 1. Ant. tarsal claws equal and both finely built (of. //. rifcoHis). 



) 2. Basal sejiment of median tarsus not excised on posterior side. 



( 1. Elytra perhaps normally with tine puncturation only at extreme 

 Q ) ajjex at the most, but small specimens with fine punctura- 



* • ') tion all over elytra occur, which, ou this character alone, must 



( be named //. rujicullis. 



The a3deagus is of a very distinct form with large hood 

 and moderate-sized saccular region. This last has a raised 

 j)art, presumably corresponding to the " wing" in noma.v and 

 rujicollts, but it is more or less globular at the anterior 

 end of Uie region. The " tongue" is short and small and in 

 the ligure is shown slightly out of its groove. The left 

 accessory lobe is in a way intermediate between the usual 

 type antl that seen in the next species. 



7. JI. immacHuitus, Gerhardt. 



This is another species which is chielly found iti lakes and 

 canals. It is frequently associated with IJ. novuij; and its 

 range in our islands corresponds fairly well with that of this 

 species, covering, however, a larger area in the south. In 



