NEPINA. 45 



dinal folds. Sternum, especially the prostermivi, concave. Legs 

 very stout ; first pair raptorial, the cox(S inserted near the ante- 

 rior angles of the presternum ; the tliujlis greatly dilated, with a 

 groove beneath for the reception of the tibia? when at rest ; the 

 tibixs falcate ; the tarsi monomerous, very short, unarticulated, 

 without claws : — second and third pairs ; thighs compressed, grooved 

 beneath ; tilics angulated, furnished with long, stout spines, and 

 long ciliae on the inner side ; tarsi long, 2-jointed, articulated, ciliated 

 on the inner side, the last joint with two claws. Stigmata of the 

 abdomen very small and indistinct. 



Family. 1.— NAUCORID^. 



Broad-oval. Head posteriorly straight, somewhat deeply inserted 

 in the pronotum ; anteriorly rounded, the eyes within the line of the 

 circumference. Antennce : third joint longest. Pronotum : anterior 

 margin somewhat squarely cut out, the anterior angles projecting 

 exterior to the base of the eyes. Elytra broad ; Glavus and Corium 

 each with one nerve. Sternum : the plates disconnected, and over- 

 lapping ; those of the metasternum raised over the third pair of coxce. 



Abdomen depressed, dilated, thin, and serrate at the margins. Con- 

 nexivum narrow. Genital segments short, covered beneath with long hairs. 

 Gen. 1, Naucoris. 



Section 'i.— NEPINA. 



Notonectides, p., Leach. 

 Nepidse, p., TFesfw. 

 Nepini, p., Burm. 

 Nepides, Am. et Serv. 

 Nepae, Fieb. 

 Nepina, Flor. 



Long, cylindrical ; or long-oval, very flat, and thin. Head 

 small, short, deeply set in the pronotum. Antennce beneath the 

 head, short, 3-joiuted, the second joint laterally produced. Eyes 

 large, posterior, prominent. Rostrum 3-jointed, free, short, stout ; 

 Labrum very small, triangular. Pronotum long and narrow, \\'idened 

 posteriorly, or broad- subtrapeziform. Elytra shorter than, or as 



