6o Insecta. Pterodicera. 



cyliadricls, siibtus liirsutls, articulis quinque; ullimo 

 paulo lougiorc, unguibus duobus, subaequalibus , ins- 

 tructo ; peJcs quatuor postici breviores^ corapresso- 

 mcmbranacci , nalatorii , retrorsum versi , femoribus 

 tibiisque trigonis; istis calcaribrs minimis, subobsoletis; 

 aiigulo externo et apicali setis compressis fimbriato ; 

 tarsis articulis quatuor, in laminas lalerales, elongatas, 

 partim plicaliles , produclis ; lamellis tribus primis 

 ad apicem timbiialis; basilari lata, trigona ; ultima ex- 

 terne setosa , in larsis interraediis biarticulata , un- 

 gui])us duobus parvis , inaequalibus , in posticis unico 

 et obsokto instructa. 



Spec. 1. Gtrinus NyiTATOR. Gyiin nageur. 



G. Scutcllatus , ovalis , duplo longior quam latior , e quarta 

 parte circiter lalior quamallior, supra virescenti aut subcae- 

 Tuleo-niger , infra niger , nitidus ; scufello Igevi , elongalo-tri»- 

 gono ; elylris punctis impressis seriatis, apice rotundatis, obtusis, 

 inlegris ; tliorace ulrinque linea Iriplici impressa , transversa, 

 antica punctata ; thoracis, elytrorumque margine infero, pedibus 

 sternoque antico rufis. 



Le Tourniquet. Gsoff. Ilist. des Insect. , tom. \ ,p. 1^4 ,p/. 5, 



fig- 5- 



Gyrinus natator. Linn. System. nat., ed. i3 , tom. i jparsn, 



p. 567. — Dytiscus natator ejusd. Faun. Suec. , ed. 2 , n°. 779. 



Toiirniquet nageur. D E Geer. Mem. s. I. Insect. , tom. 4 ,p. 355, 

 /;/. \l , fig. 4. 



Gyrinus natator. Fab. System. eleut., tom. 1 , p. 274. 



Gyrin nageur. OLir. Entom. , tom. 5 , n°. Ai,pl. 1 , fig- 1. 

 a. b. c. d. e, 



Gyrin nageur. Latr. Hist. nat. des Crust. et des Insect. , tom. 

 S , p. 1 53 , pl. 69 , Jig. 1 — 4. 



Ii.(BS. Insect., tom. 3 , tab. 3i. 



Panz. Faun. Insect. Germ., fasc. 3 , fig. 5. 



Habitat in Europae aquis, veris felix nuncius. 



