British Hemiptera-Heteroptera. 643 



NAUCORIDyE. 



a. Front tarsi distinct, two-jointed .._ -• .. Aj^lielocheirus. 



b Front tarsi apparently in one piece, witli the tibiaB 



without joints .. •• JVaucoris. 



Aphelocheirus. 

 1. (Bstivalis, Fab. Fig. Dougl. & Scott, Brit. Hem. 

 pi. xix. fig. 5. -11 



Luteous-brown. Head, legs and some occasional mark- 

 ings paler, dull, short, very mucli depressed, oval ; very 

 finely wrinkled and rugose throughout. Thorax deeply 

 emarginate in front; sides rounded, lateral margms with 

 very short projecting hairs, set at regular intervals ; base 

 sti-aight, very wide ; sides of the elytra sinuate at the base. 

 All the recent specimens have the elytra rudimentary, about 

 twice the length of the scutellum. Abdomen with each 

 segment produced at the sides backwards into a sharp 

 spine-like tooth. 



Length 4 — 5 lines. 



Rare ; near Norwich ; Bagley Wood, Oxford ; Eynsham 

 Paper Mills, &c. 



Naucoris. 

 1. cimicoides, Linn. Fig. Dougl. & Scott, Brit. Hem. 

 pi. xix. fig. 6. , n • 1 



Oblong-ovate. Head and thorax shining yellowish- 

 green, in life ; punctured with brown, the punctured por- 

 tion forming a sort of darker spot on each side of the 

 dorsal line. Elytra dull, very densely and finely punc- 

 tured, greyish-brown. Connexivum pale, finely ciliate ; 

 apices of the segments darker; front femora very thick. 



Length 5—6 lines. 



Common in ponds, &c. 



NOTONECTID^. 



I Eostrum four-jointed ; tarsi two-jointed. (Species large 



and subelongate) Notonecta. 



II Eostrum three-jointed; tarsi three- jointed. (Species small 



and very short) ^'^*- 



NOTONECTA. 



L glauca, Fab. Fig. Dougl. & Scott, Brit. Hem. pi. xx. 

 fig. 4 =: var. maculata, Fab., &c. 

 Very variable in the colour of the elytra. Head and 



