GLASS V. INSECTA. 
227 
Inhabits England, near Bristol., Plymouth, and Exeter. 
Elytra with the apex of a palish black. 
Sp. 3. Not. glauca. Elytra grayish, the margin with minute blackish 
spots : back black, the apex pale brownish. {PI. 5. fig. 3.) 
Notonecta glauca of authors. 
Inhabits Britain in almost every pond. 
Genus 290. PLEA. Leach, Trans, of Linn. Soc. vol. xii. 
Body of a squarish oval: antenna with the third and remainder of the 
j oints largest : anterior tarsi with the articulations nearly equal : claws 
on the hinder feet large. 
Hie thorax is obscurely hexagonal with the hinder margin prominent 
and rounded, the head as broad as the broadest part of the thorax: 
the eyes are rather oblong, without the least tendency to converge 
behind : the hinder pair of legs not more ciliated than the others, but 
are terminated by very strong and distinct claws : tips of the elytra 
acuminated and entire. 
Sp. 1. Not. minutissima. Gray with a brownish line in the front: thorax 
t and elytra deeply punctured. 
Notonecta cinerea, anelytra. Geoff. Ins. Far. i. 477. 2. Notonecta 
minutissima. Fourc., Latr., Oliv., Fabr. Plea minutissima. Leach. 
Length of the body 1-1 lin. 
Inhabits ponds and stagnant waters near London in profusion. 
“ This species has been considered by Geoffroy, Fabricius and OIL 
vier, as Notonecta minutissima of Linne, which reference undoubt- 
edly belongs to the following species ; viz. to Sigara minutissima’' 
“ Geoftroy has described the larva:, never having seen the perfect 
insect.” 
Stirps 2. — Body roundish and depressed: tarsi, the anterior with one 
articulation ; the hinder with two ; base and margin of the elytra 
only channelled. 
Genus 291. SIGARA. Leach, Trans. Linn. Soc. vol. xii. 
Scutellum distinct: thorax divided by a transverse line : body ovate, the 
posterior part acuminated. 
kp. 1. Sig. minutissima. Above cinereous: elytra brownish with very 
faint spots ; the under part and feet yellowish. 
^otonecta minutissima. Linne. Sigara minutissima. Leach. 
Inhabits rivers and running waters in England, Ireland, and Scotland. 
Length of the body 1 lin. 
Genus 292. CORIXA. Geoffroy, Leach. 
Scutellum none : thorax transverse, the posterior part produced : body 
long, the anterior and posterior part rounded. 
“ The thorax is more or less produced behind in all the species of 
this genus, but is not evident in the first division of this genus until 
p 2 
