APHELOCHIRINA. 43 



Family 1.— LIMNOBATIDtE. 



Head horizontal, as long as the thorax, widest on the anterior 

 margin of the clypeiis ; Face very short, narrow, deflected ; cheek- 

 plates long, projecting. Antemits inserted at the end of the 

 widened front of the head ; first joint stoutest and shortest ; third 

 longest. Tliorax much wider than the head. 



Abdomen flat above, couvex beneath ; Corviexiviim reflexed, narrow iu the 

 $ broad in the $, gradually diminished from the middle to the base and 

 apex, not produced into a point posteriorly ; Genital segments iu $ quad- 

 rangular, in ? short, obtuse; in both sexes terminating with a small 

 superior incurved spine. Gen. 1, Limnotjcdes. 



Div. 2.-CRYPT0CERATA.* 

 Sub-l)iv. 1. LiTORALIA. 



Contains only the Genus Pelogonus, Latr., which is 

 wanting in Britain. 



Sub-Div. 2. — Aquatilia. 



Section \,— APHELOCHIRINA. 



Acanthiidse, p., Westw. 

 Aphelochira3, Fleh. 



Head (including the eyes) triangular, deeply set in the pronotum ; 

 Tace on the same plane as the Groivn. Antennce 4-jointed, simple. 

 Eyes posterior, ohlique. Rostrum 3-jointed, very long, aculeate; 

 Labram triangular. Pronotum broad, transverse ; posterior margin 

 longer than the breadth of the abdomen. Elytra coriaceous through- 

 out ; Embolium triangular. Prosternum concave at the sides. 

 Legs : first pair raptorial, inserted anteriorly on the disk of the pro- 

 sternum ; Cox(V large, long; tliiyhs compressed, first pair broadest and 

 shortest ; tarsi all 2-joiuted, and with two claws. 



Abdomen broad, oval, the margins serrate. 

 * Page 11. 



