SCUTATINA. 11 



Sub.-Div. 2. HYDUODROMICA, Fieb., Flor. 

 Amphibicorisse, Lat., Duf. 



Elytra formed of one piece. Legs formed for running or leaping 

 on the surface of water. Claws inserted before the end of the last 

 joint of the tarsi (except in the genus Limnobates) . 



Div. 2. CRYPTOCERATA, Fieb., Flor. 

 Hydrocorides and Naucorides, Fall. 

 Hydrocorisa, Lat., Zett., Westw. 



Antenna? 3 4-jointed, very short, and concealed in cavities be- 

 neath the eyes. Legs natatorial. 



Sub-Div. 1. LITORALIA, Fieb. 



Ocelli 2. Hostrum 4-jointed. Antennso 4-jointed, simple. Tarsi 

 3-jointed. (Wanting in Britain.) 



Sub-Div. 2. AQUATILIA, Fieb. 



Ocelli 0. Antennae 3 4-jointed, simple, or with a side process 

 on the middle joint. Tarsi 1 3-jointed, differing on 2 or 3 pairs of 

 legs. ^ 



Div. 1. GYMNOCERATA. 



Sub-Div. 1. GEODROMICA. 

 SECTION I. SCUTATINA. 



Scutati, Burm. 



Scutata, Datt., Flor. 



Longiscuti, Am. et Serv. 



Scutelleridse, Westw. 



Cydnidse, Tetyra3, Macropeltidse, Fieb. 



Structure robust, convex. Head more or less deflected ; lateral 

 margins sharply defined. Rostrum 4-jointed, base in a channel on 

 the under side of the head; Idbrum long, narrow, transversely 

 wrinkled. Antennae 3 5-jointed (in British species always 5- 



