NAUCORINA, 579 



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

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

 using its hind legs j creeps slowly, using its four fore-legs, J. 0. 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 Lansdown G-uilding's collection, 

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



SECTION %. NAUCORINA* 

 FAMILY 1. NAUCORIDJE. 



Genus 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. Antennae short, 

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

 4th short, sub fusiform, more slender than the others. jEyes large, 

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

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

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

 Idbrum obtusely triangular, wider than the labium. 



Thorax. Pronotwn subtrapezoidal ; anterior 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 ; Clavus with 1 nerve ; 

 Corium with 1 nerve continued from the embolium; posterior 

 margin angulated ; Membrane without nerves. Sternum ; Pro- 

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

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

 margin roundly produced upon each side upon the mesosternum ; 

 jfrlesosternum short, raised and obtusely triangular in the middle ; 

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

 posterior coxae. Legs very stout ; coxce large, convex inwardly, 

 concave outwardly, anterior pair slender towards the apex ; thighs 



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