Ord. III. Fcun. II. , Cimicides. i53 



Hydrometra rivulorum. Fab. Sjstem. Rhyng. , p. 269. 

 Habilat in Gallia , Australi pra3seiiim , rivulis , fontibus. 



Spec. 2. Velia currenS. Velie vagabonde. 



V. Aptera, nigra ; thorace punclis tluobus anticis sericeo- 

 albis ; abdominis iuferi meclio longitvTdinali ejusqvie marginis 

 elevati punctis rufis. 



Velie vagabonde. Latr. Hist. nat. des Crust. et des Tnsect. , 

 tom.. ii, p. 270. 



Hydrometra currens. Fab. System, Rhyng. , p. sSg. 



CoqvEB. Illust. Icon. Insec. , dec. 2, tab. 19, Jig. ii. 



Habilat in Galliae , Italias , rivnlis , fossis. 



CCCLXXIV. Genus. Gerris. Gerris. 



Ciniex , LiNN., Geoff. , ve Geer , Schrank. — 

 Hydrometra , Fab. — Aquarius , Schellenberg. 



Antennce filifornies, artlculo priino longiore, iillimo 

 cylindrico. Rostruni acl basin arciiatum , externe veluti 

 quadriarticulalum , stipite ejus nodiformi arliculocjue 

 primo et annuliformi exsertis, Pedes medii aliis lon- 

 giores, poslicis admodura proximi , ab anticis \alde 

 remoti , corpore suliduplo longiorcs •, antici quatuor 

 posticis mtrfto breviores , crassiores, raptorii , figura 

 solita •, hi filiformcs; ultimis mediis pavilisper graci- 

 lioribus ; tarsi omnium biarticulati. Caput antice sub- 

 recta porrectum. 



Corpus clongato-ellipticum , yalde angustura , sub- 

 ineare. 



Spec. 1. Gerris PAtVDVM. Gerris des marais. 



G. Supra obscure fusco-olivaceo-nigra , infra serlceo-cinerea ; 

 abdomine snbspque lato , trunci capitisque longitudine, infra 

 carinato , linearum impressarum serie , ex ulroque latere ; 

 dentibus duobus conicis , elongatis ad illius apicem ; anlennis 

 pedibusque nigris : ihorace linea elevata , dorsi medium per- 



