Ai/ahus.l ADEPIIAGA. 19'"> 



stono, 'I'lie Unit, near Farnh;UTi ; Norwich. St. Fiitli's; Strensall, near Yorlc ; Xorth- 

 umljurland aud Durhain district ; Scotlaiul, local, Lowlauds, but widely distributed, 

 Tweed, Forth, Tay, Sohvay, Clyde, and Moray districts. 



A. abbreviatus, V. {invhilatua, Sclir.). Oval, convex, shining, 

 very finely reticnlite, underside pitchy with hinder segments of ahdomen 

 reddish behind ; upper surface bronze ; head and margins of thorax red ; 

 elytra with a very plain waved testaceous band near base stretching 

 across their whole breadth but, as a rule, not quite reaching suture, a 

 waved spot behind middle connected with the basal marking by a 

 lateral band, and another near apex which is small and sometimes in- 

 distinct ; antennae and legs red ; elytra very finely punctured besides the 

 usual larger punctures ; male with the anterior and intermediate tarsi a 

 little thickened. Long. 7|, lat. 4 mm. 



Ponds, &c. ; very local ; abundant in Askham Bojj, where it is the commonest 

 member of the genus at some seasons of the year (I have taken it in profusion in 

 August with Archdeacon Hey) ; also recorded from Shropsliire, Windsor, Leominster, 

 &c. ; formerly abundant in the Fen districts, Whittlesea Mere, &c. ; one of the most 

 distinct of the British species, and known at once by its colouration, which is quite 

 peculiar to it. 



Group XVII. 



Prosternal process flat, very finely, or indistinctly, margined ; male 

 with posterior tarsi much thickened, and furnished beneath with re- 

 markably large palettes ; wings of metasternum only moderately large ; 

 swimming legs moderately long and stout ; surface conspicuously reti- 

 culate. 



A. arcticus, Payk. Oblong oval, rather narrow, not very convex, 

 dull ; head black with mouth and two more or less distinct spots on 

 vertex red ; thorax black with margins and a broader or narrower band 

 across disc reddish-testaceous ; elytra black with margins broadly light ; 

 antenna; and legs red, the former with apex of last joints fuscous ; upper 

 side very closely and irregularly reticulate ; lateral margins of thorax 

 very fiiu; ; male with the front claws uncipial, th(! anterior shorter and 

 furnished with an angular projection ; reticulation of upper surface very 

 deep in female. Long. 7, lat. 3 ^- mm. 



A northern sjiccies extending across North Europe and Arctic Siberia to North 

 America; Northnmberlaud district, Whittingham near Alnwick (G. Wailes) ; Cheviots 

 (.1. Hardy); Scotland, local, Highlands, Forth, Tay, Dec, Solway, Clyde, Argyle, 

 Moray, and probably extending to the extreme north. 



A. Sturmii, C!yll. Oval, rather convex, dull, finely and closely 

 reticulate ; bead aud thorax black, somewhat ajneous, margins of latter 

 broadly testaceous; elytra fuscous with sides broadly testaceous, antenna3 

 and legs reddish, apex of last joints of former, and middle of femora of 

 latter blackish ; lateral margin of thorax fine; male with the front claws 

 elongate and of about equal length, apical joint of middle tarsus very 

 elongate ; sculpture of sexes identical. Long. 8, lat. 11 mui. 



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