228 MODERN systew. 



the elytra have been elevated. The front, the under parts of the body, 

 and the legs, in all the British species are yellowish." 



* Eli/tra to the apex gradually decreasing and ending in a point. 

 The channel on the anterior margin of the elytra in this division 

 is uninterrupted, and gradually disappears before it reaches to the 

 extremity of the elytra. 



Sp. 1 . Cor. coleoptrata. Thorax reddish-gray : elytra palish yellow, with 

 longitudinal rows of black spots. 



Sigara coleoptrata. Elytra wholly coriaceous and brown: the exterior 

 margin yellow. Fabr. Syst. R/ii/ng. 105. 4. 



Inhabits ponds and ditches near Norwich. Dr. Leach has observed, that 

 although the character by Fabricius does not accord with that given 

 above, yet as he drew his description from a museum specimen (which 

 generally assumes the colour he mentions) tlie Doctor has given his 

 synonym without any hesitation; but this insect is distinct from the 

 Sigara coleoptrata of Panzer, which is figured with a scutellum, and 

 most probably belongs to the genus Sigara as mentioned above. 



** Elytra at the apex rather rounded. 



The channel in the fore part of the elytra, at about two-thirds from 

 its commencement, is interrupted by an oblique, transverse, elevated 

 line, and it terminates abruptly before it reaches to the apex of the 

 elytron, and then it leaves the margin inclining a little inwards or 

 backwards. 



a. Elytra and thorax rough. 

 Sp. 2. Co7\ striata. Thorax and elytra brown with yellow lines and 



transversely striated : back black, sides pale yellow. 

 Notonecta striata. Linn. Corixa striata. Leach. 

 Inhabits stagnant waters. 



Sp. 3. Cor. stagnalis. Thorax with numerous transverse yellow lines : 

 elytra brown, besprinkled with minute yellowish dots : anterior part 

 of the margin yellowish ; posterior with yellowish lines ; back brown- 

 ish black. 

 Corixa stagnalis. Leach, Tr. Linn. Soc. xii. 

 Inhabits ponds and stagnant waters. 



This species is about half the size of C. striata. 

 Sp. 4. Cor . fossarjmi. Brown : thorax with six transverse yellow lines : 

 elytra brown, with minute yellowish dots, the anterior part yellow- 

 ish, towards the base of the posterior part yellowish lines : back 

 yellowish. Smaller than C. stagnalis. 

 Inhabits ponds and ditches. 

 Sp. 5. Cor. lateralis. White : thorax with seven black lines : elytra with 



minute black spots, anterior margin immaculate. 

 C. lateralis. Leach, Trans. Linn, Sdc. xii. 



