INSECTA. 441 



Sp. Belostoma grande, Nepa grandis L., RCESEL, Ins. ill. Tab. 26, from 

 South America ; Belostoma indicum LE PELETIER et SEBV., STOLL, 

 Wantzen, PI. vn. %. 4, from the West Indies. The largest species of this 

 order. The stiliform appendage at the abdomen is not, according to 

 SPINOLA, for respiration, and thus does not correspond to the filaments at 

 the abdomen of Nepa, GUERIN, Revue zoologique, 1839, Avril, p. 112. 



Note. Sub-genera Diplonyclms and Sphcerodema LAPORTE are 

 scarcely distinct. 



Sp. Belostoma rusticum, Nepa rustica FABR., STOLL, Wantzen, PI. vn. fig. vi. 

 The females carry the eggs on their back, like Pipce amongst the 

 JBatracko'idea. 



Nepa mihi (Nepa and Ranatra FABR.) Antennas triarticulate. 

 Jl the tarsi with only one distinct joint. Abdomen provided with 

 spiratory appendage formed of two setae. 



* Body oval, depressed. 

 Sub-genus Nepa FABR., LATR. 



Sp. Nepa cinerea L., SWAMMERDAM, Bill, nat. Tab. in. fig. 4; RCESEL, Ins. 

 in. Tab. 22 ; ScHELLENBERG, Cimic. Tab. xiv. ; DUMER. Cons. gen. s. I. Ins. 

 PL 37, fig. 2 ; Waterscorpion, very common with us in ditches and fish- 

 ponds; the eggs, already described and figured by SWAMMERDAM, have 

 seven threads at the end, which cause them to resemble the plumed seeds of 

 Syngenistas. 



* Body slender, elongate. 

 Sub-genus Ranatra FABR., LATR. 



Sp. Nepa linearis L., SWAMMERDAM, 1. 1. fig. 9 ; KCESEL, Ins. HI. Tab. 23, 

 &c. ; rarer than the former species. 



II. Ocelli two. 



Galgulus LATE. Ocelli two, frontal. 



Sp. Galgulus oculatus, Naucoris oculata FABR., CUVIER, R. Ani. ed. illust., 

 Ins. PI. 93, fig. 4. 



Mononyx LAPORTE. 



Pelogonus LATR. Rostrum elongate, with sheath triarticulate, 

 second joint long. Ocelli in vertex. 



Sp. Pelogonus marginatus LATR., GERMAR, Faun. Ins. Europ. Fasc. xi. 

 Tab. 23; Cuv. R. Ani. ed. ill. PI. 93, fig. 3 ; on the coasts of the south of 

 France and of Spain. This genus makes the transition to Salda, but can 

 scarcely, on account of the insertion and the shortness of the antennae, be 

 placed elsewhere than in this family. 



