568 HYDUOilETRINA. 



Species G. — IIydrometra augentata. 



Gerris argextata, Sc/mm. Beitr. 2, 49, 9 (1S32) ; //. Sdf. Norn. Eut. 



1, 63 (1S35). 

 — AncALis, Qo-i. B. E. xii, 553, G, pi. 553 (1835). 

 Hydrometra — //. Sckf. Wanz. ix, GS & 7i, t. 301, fig. 932 (1S50) ; 



Flor, Rhyn. Liv. i, 740, G(ISGO); Fieb. Europ. 



Hem. 109, 13 (ISGl). 



Above black-brown ; beneath black, witb a silvery gloss in oblique 

 aspects. AntenncB black. Pronotum with a slight nuLldle kccl 

 ceasing on the scutellar process, with a short, dull yellow line 

 in front, posteriorly silver}^, shining, the flattened margin of 

 the process with short, silvery shining hairs. Elytra black- 

 brown, in certain lights blue-gray ; sheaths of the middle coxcb 

 perceptibly keeled on the outer side. Legs black ; 1st pair 

 of tliiglis yellow at the base on the inner side. 



Head; sides with a silvery white line. AntenncG\As;iQk ; 1st joint 

 shorter than the 2nd 3rd and 4th together ; 3rd extremely minute ; 

 5th longer than the 2nd. Hijes and Ocelli black. Hostrum black, 

 2nd joint yellowish. 



Thorax. — Pronotum ; 1st region flat, with a slight keel, the 

 anterior y of which has a dull yellow line ; the sides incrassatetl, 

 rounded ; sides of the middle region rounded ofi', but produced at 

 the hinder angles into a dwarf tubercle ; the undercurved margin 

 in both regions with a narrow yellow line, broadly interrupted at 

 the constriction ; disk flattish, punctate-granulate, with a fine 

 central, bare, silvery, shining keel ; scutellar process more convex, 

 the keel almost imperceptible, the sides and apex rounded, the 

 flattened margin narrow, clothed with shining, silvery liairs. Elyira 

 black-brown, in oblique aspects blue-gray ; nerves with brassy scale- 

 hairs. Wings fuscous-brown, white on the basal 3rd. Sfermtm 

 black ; Frosternum with a yellowish spot towards each side ; MesO' 

 sternum; sides viewed from above black, divided into 2 lines by a 

 silvery-gray longitudinal streak ; sheaths of the 2nd and 3rd pairs 

 of coxae black above and beneath, the posterior margin beneath 

 narrowly yellowish, the outer sides of the 2nd pair perceptibly 

 keeled ; on the inner side a silvery line. Legs ; eoxce black, yellow- 



