NEPINA. 45 



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

 very stout ; first pair raptorial, the coxce inserted near the ante- 

 rior angles of the prosternum ; the tliigJis greatly dilated, with a 

 groove beneath for the reception of the tibiae when at rest; the 

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

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

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

 long cilise 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^E. 



Broad-oval. Head posteriorly straight, somewhat deeply inserted 

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

 circumference. Antennae : 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 COXCB. 



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

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

 Gen. 1, Naucoris. 



SECTION . NEPINA. 



Notonectides, p., Leach. 

 Nepidse, p., Westw. 

 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. Antenna beneath the 

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

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

 Labrum very small, triangular. Pronotwn long and narrow, widened 

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



