British Hemiptera-Heteroptera. 641 



Velia. 

 1. currens. Fab. Fig. Dougl. & Scott, Brit. Hem. 

 pi. xix. fig. 2. 



Brown ; head black. Thorax deeply punctured, with 

 the anterior margin paler, and a bright silvery spot near 

 each anterior angle. Elytra blackish, with two spots near 

 the base, an oval spot in the middle, and a round small spot 

 near the apex, white. Legs and antenna broAvn. Posterior 

 thighs in the $ denticulate and with two longer teeth 

 on each. Connexivum yellow, spotted with black. The 

 undeveloped form has no elytra. 



Length 3^ — 4 lines. 



Common 'in streams, &c., in the undeveloped form. 

 Developed form rare. 



Mesovelia. 

 1. furcata, Muls. & R. Fig. Ent. Mo. Mag. vol. iv. 



pL i. fig. 1. 1 -1 J 



Elongate, blackish-brown ; thorax considerably widened 

 posteriorly, posterior angles rather prominent and largely 

 rounded; scutellum wdth a deep, transverse channel near 

 the apex, the apex sHghtly elevated. Elytra pale whitish, 

 very thin, the nerves very thick and black; apices diver- 

 gent and pointed; connexivum luteous; legs luteous, finely 

 hairy, the apices of the femora and tibife and the whole of 

 the tarsi, black; antennte three-fourths as long as the body, 

 black. 



Length 2 fines. 



Trent ; and several specimens lately taken elsewhere by 

 Dr. Power. 



Undeveloped form pale yellowish-green, more or less 



spotted with black. 



Hebrus. 

 1. pusillus, Fall. Fig. Dougl. & Scott, Brit. Hem. 



pi. xix. fig. 4. , ., 1 • 



Brownish-black, with fine, very short, silvery hairs. 

 Thorax with a deep dorsal impression in front; sides 

 rather deeply emarginate. Elytra with a pale spot on 

 each side of the scutellum; membrane grepsh-brown, 

 with paler markings. Legs and antennifi testaceous. 

 Length 1 line. 



Not rare; in ponds, *S/?A«^w?m, &c. , , , , 



The undeveloped form is smaller, often has the head red, 

 and is destitute of elytra. 



