VELIA R1VULORUM. Ill 



The antennae eleven-jointed, and terminated by a reversed 

 conical club. 



I must not describe so fully any more of these beautiful 

 slides ; but recommend you, if possible, to obtain the fol- 

 lowing whole mounted Coleoptera : 



Lcecophilus Minutas, remarkable for its feathered legs. 



Hattica, or Turnip-fly, thick muscular 

 thighs for leaping. 



TJiyanus, or Grass-flea, also with muscular thighs and 

 sculptured elytra. 



Dimonia cynoglossi one of the Tetramera,with thickened 

 thighs and beautiful head. 



Haliplus confinus . one of the Hydrocantheri, or Swim- 

 mers with beautifully fringed legs 

 for swimming. 



HypJddius ovatus . one of the Water-beetles, with 

 fringed legs for swimming, and a 

 curious spine at the tip of each 

 elytron. 



Oyrinus natator . a Water-beetle. (This is described 

 in leg of Gyrinus.) 



HEMIPTERA. 



These are sucking insects. Their mouth has a long 

 retractile tube, and several fine lancets, forming a long pro- 

 boscis, which is laid along the breast during repose, and 

 may be seen in all the Field-bugs (Cimex) and the Aphides, 

 which belong to this order. The wings are membranous, 

 and covered with semi-transparent cases analogous to the 

 elytra of Beetles. The tarsi are always three-jointed. A 

 few of them inhabit the water, and of these the Telia rivu- 

 lorum and Notonecta are mounted whole. 



VELIA mVULORUM. 



Most people have observed groups of water insects sport- 

 ing on the surface of small ponds, or swimming against 

 small streams, walking lightly on the still water, and rest- 



