NAUCORINA. 579 



"In the Eveul ode where it forms the mill-pool (at its north-east angle) 

 at Eyusham Paper Mills, in June, 1832. Swims very fast, chiefly 

 using its hind legs ; creeps slowly, using its four fore-legs, J. O. W." 



" My specimen from Bosc's collection, as figured in my ' Introduc- 

 tion,' and by Coquebert, has fully developed hemielytra and 

 wings." 



" "We have it also with rudimentary hemielytra and wings in the 

 Hope Collection, obtained from Lansdowu Guilding's collection, 

 marked ' Europa,' and stuck with a short English pin." 



Section 2.~iYJUC0BINA^ 



Family 1.— NAUCORIDyE. 



Gem(s 1. — Naucoris, Geoffr. 

 Broad-oval, slightly convex. 



Head transverse, from above semilunate ; Face very short, ver- 

 tical ; with a fovea on each side close to the eyes. AnteuncB short, 

 stout ; 1st joint annular ; 2nd twice as long as the 1st ; 3rd longest ; 

 •1th short, subfusiform, more slender than the others. Eijes large, 

 sub triangular, posteriorly trenching on the pronotum. Hosiricm ; 1st 

 joint short, broad ; 2nd narrower, tapering, more than twice as long 

 as the 1st, flattened in front, convex beneath ; 3rd short, conical ; 

 Jahrum obtusely triangular, wider than the labium. 



Thorax. — Pro;io^«f«j subtrapezoidal ; antei'ior margin straight be- 

 tween the eyes, slightly concave behind them ; anterior angles 

 advanced, and clasping the base of the eyes ; sides scarcely rounded, 

 with a distinct, narrow, linear margin. Elytra ; Clamis with 1 nerve ; 

 Corium with 1 nerve continued from the embolium ; posterior 

 margin angulated ; Ifemlrane without nerves. Sternum ; Fro- 

 sternum very concave, the middle with a deep, wide, sharp keel ; 

 sides of the sockets of the coxte prominent, foliaceous ; posterior 

 margin roundly produced upon each side upon the mesosternum ; 

 Mesosternum short, raised and obtusely triangular in the middle ; 

 Iletasternum ; the side-plates subrhomboidal, greatly raised over the 

 posterior coxiB. Legs very stout ; coxcb large, convex inwardly, 

 concave outwardly, anterior pair slender towards the apex ; thiglis 



* Pas:e 44. 



