G6 LINNEAN SYSTEM. 



water fishes, as are also the files : they are more numerous in running 

 than in standing waters. 



Genus 56. Piirygaxea. 

 Mouth with a horn}', short, arched, acute mandible, without teeth ; and 

 a membranaceous maxilla: palpi four: stetiimaf a three: aiitemi^ i>c- 

 taceous, longer than the thorax: uiiigs incumbent; the hinder ones 

 folded. {PU.Ji-.-d.) 



Genus .'^7. Hemerobu's. 



Mouth with a straight horny mandible: a cylindrical, straight, cleft 

 vmxilla: lip stretclied forward and entire: four projecting, unequal, 

 {\V\ion\\ put pi : no all miiiatu : ?««^'s defiected, not folded: antenna se- 

 taceous, projecting, and longer than the thorax, which is convex. 

 The species of this genus in all their stages feed upon small insects, 

 especially the Aphixks; their larvse have six feet; in most species they 

 are oval and hairy; the pupa^ are inactive, and inclosed in a case. The 

 eggs are deposited on leaves in the midst of Aphidca ; they are sup- 

 ported on small pedicles and set in the form of bunches. The larvae at- 

 tain their growth in illtcen or sixteen days, and the pupa incompleta re- 

 mains for three weeks before the fly comes forth. 

 Sp. 1. H. Chrysops. {PI. T.ftg.-i.) Chrysops maculata, Leach. 



Genus 58. Panorpa. 



Muuth stretched out into a cylindrical horny rostrum : the mandible is 

 without teeth : nui vilLc bifid at the apex : lip elongated, and covering 

 the whole mouth : /^w//)/ four, nearly equal : stemmataihvee: antennae 

 filiform : the lad of the male armed with a chela, that of the femal^ 

 unarmed. 



S|i. 1. P. conmnotis. {PI. 7. fig. 5. a. chela magnified.') 



Genus 59. Raphidia. 

 Month with an arched, dentated, horny mandible : a cylindrical, obtuse 

 horny maxUlu : a rounded, entire, and horny lip : palpi foiu", very 

 short, nearly equal, and filiform : stemmata three : 7cings deflected : un- 

 tennec filiform, of the length of the thorax; elongated before, and 

 cylindrical : tail of the female with a lax recurred seta. {PI. 7. fig. G.) 



Order V. IIYMEXOPTEUA. 



Wings four, membranac(^ous : mouth with maxilla", and some of them 

 likewise a tongue. Between ihe large eyes they have generally three 

 slemmata. At the extremity of the abdomen the females of several of 

 the genera have an aculcus or sting, that lies concealed within the ab- 

 domen, which is used as a weapon, and instils into the wound an acid 

 poison : those which want the sting, are furnished with an oviduct, that 



