CORIXINA. 591 



Species 1. -PLEA MINUTISSIMA. 



NOTONECTA MINUTISSIMA, Fab. E. S. iv, 59, 6 (1794) ; S. R, 140, 10 



(1803) ; Oliv. Enc. viii, 389, 12 (1789) ; 



Lot. Gen. iii, 150 (1807). 

 PLEA Leach, Trans. Liu. Soc. xii, 14, 1 (1817)} 



Fieb. Europ. Hem. 101 (1861). 

 PLOA (Steph.} Burm. Handb. ii, 189, 1 (1835) ; Am. 



et Serv. Hem. 449, 1 (1843) ; Fieb. Ent. 



Mon. 17, 1, 1. 1, figs. 2735 (1844). 



Cinereous-gray clouded with brown, varying iu depth of colour, 

 slightly shining. 



Head ochreous, punctured, with a smooth, brown, longitudinal line 

 in the middle. Eyes brown. Rostrum ochreous, last joint black. 



Thorax. Pronotum anteriorly ochreous, punctures large, the 

 intervals reticulated. Scutellum brown, smooth, the sides finely 

 crenate. Elytra; Clavus and Coriuin more or less clouded with 

 brown, covered with round black or brown punctures ; Corium; base 

 and 1 or 2 undefined spots on the disk pale, the impressed line 

 within the anterior margin brown. Legs ochreous, base of the thighs 

 sometimes dusky ; apex of thighs, tibice, and tarsi, piceous ; claws 

 black. 



Abdomen beneath pitchy black, clothed with close appressed hairs. 



Length, f 1-J- line. 



Common amongst the vegetation in stagnant water, in spring and 

 autumn. 



SECTION $. 



FAMILY 1. CORIXID^E. 



Genus 1. CORIXA, Geoffr. 

 Long-oval, subparallel, convex above, smooth and usually shining. 



Head transverse, scutellate, including the eyes scarcely wider 



than the pronotum ; Crown imperceptibly separated from the face, 



convex, vertical in front ; Face ; in the <$ flat or concave, in the 



? generally convex. Antennas concealed, subocular, very short, 



* Page 49. 



