Ilijdatkui.'] ADEPHAGA. 207 



KVDATZCUS, Leach. 



AlDOut fifty species are coutaiiu'd in this genus (and probably a good 

 many others now referred to otlier genera) ; they are widely distributed 

 over the world both in the nortliern and southern hemispheres : two of 

 these are British; they may easily be distinguished as follows : — 



1. Klvtra with a transverse yellow band just before base . H. TEAXSVEESALiSjiJerj'. 



2. Elytra without transverse band H. seminigee, De O. 



K. transversalls, Berg. Oval, rather broad, under side pitchy 

 witli itrosturnuni and middle of head testaceous ; upper side black with 

 the head red in front and with two red spots on vertex ; thorax broadly 

 red in front and at sides ; elytra with margins broadly testaceous with 

 irregular and interrupted dark thin bands on the light portion, and also 

 with a testaceous transverse band on each near base ; anterior pairs of 

 legs red, posterior pair pitchy ; antennae red ; male with front tarsi 

 moderately large, dilated joints forming a round disc and furnished with 

 suckers. Long. 13, lat. 7 mm. 



Ponds, &c. ; not common ; London district, Battersea Fields (Stephens) ; Norfolk ; 

 Quy Fon and \^'icken Fen, Cambridge; Whittlesea Mere; Swansea; Devonshire (?) ; 

 Askham Hog, scarce, but found occasionally; Mr. Hey sent me a pair taken this year 

 (May 1885) ; it was last found there in Sept. 1881. 



K. seminig'er, De G. {Hijhneri, Fab.). Very like the preceding 

 but broatlcr with no transverse band at the base of the elytra; antennoe 

 and anterior pairs of legs red, intermediate tibiie pitchy, posterior legs 

 pitchy ; female with the black colour on thorax often more extensive 

 than in the male, and sometimes reaching front margin. Long. 13, lat. 

 1\ mm. 



Ponds, &c.; not common; London district, very local, but occasionally found in 

 some numbers ; Lee, Earlswood ; in the former locality Dr. Power once took eighty 

 sfict'imens in one day ; Whittlcsea iMcre ; Yaxley Fen ; Wicken Fen ; Askham Bog 

 (rare) ; recorded formerly from Sliropshire. 



THERMONECTINA. 



In this tribe the suture between the metathoracic episternum and the 

 wing of the metasternum is curved ; the spurs of the hind tibiae under a 

 high magnifying power are distinctly emarginate at apex : the tribe 

 contains six genera, of which two are British: these maybe distinguished 

 as follows : — 



1. Elytra closely and strongly punctate ; female always sulcate 



in our species AciLirs, Leacli. 



2. Illytra very linely punctata-, apparently smooth; female not 



sulcate GicAruoDJiBES, Hsch. 



ACIIiZUS, Leach. 



This genus as constituted by Dr. Sharp (who separates ofl' a number 

 of the species under 'JlnTmnnertrx^ Esch.) contains six species, wliich are 

 peculiar to Europe and North Ameiica. 



