XiINNEAN SYSTEM. 
66 
water fishes, as are also the flies: they are more numerous in running 
than in standing waters. 
Genus 56. Pubyganea. 
Mouthivith a horny, sliort, arched, acute mandible, without teeth ; and 
a membranaceous maxilla: palpi four: stemmala three: antenna: se- 
taceous, longer than the thorax : wings incumbent ; the hinder ones 
folded.' (PI. 7.fg.3.) 
Genus 57. IIemerobius. 
Mouth with a straight horny mandible: a cylindrical, straight, cleft 
maxilla \ lip stretched forward and entire : four projecting, unequal, 
filiform palpi : no stemmuta : wings deflected, 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 Aphides; their larva; 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 Aphides; they are sup- 
ported on small pedicles and set in the form of bunches. The lame at- 
tain their growth in fifteen or sixteen days, and the pupa incomplete re- 
mains for three weeks before the fly comes forth. 
Sp. 1. H. Chrysops. (PL 7. fig. 4.) Chrysops macufata, Leach. 
Genus 58. Panorpa. 
Mouth stretched out into a cylindrical horny rostrum : the mandible is 
without teetii : maxilla: bifid at the apex : lip elongated, and covering 
the whole mouth : palpi four, nearly equal : stemmata three : antenrue 
filiform : the tail of the male armed with a chela, that of the female 
unarmed. 
Sp, 1. P. communis. (PL 7. Jig. 5. a. chela magnified .) 
Genus 59. Raptiioia. 
Mouth with an arched, deutated, horny mandible : a cylindrical, ohtusc 
horny maxilla: a rounded, entire, and horny lip: palpi four, very 
short, nearly equal, and filiform : stemmata three : wings deflected : an- 
tenna: filiform, of the length of the thorax; elongated before, and 
cylindrical : tail of the female with a lax recurved seta, (PL 7. fie. 6.) 
Order V. IIYMENOPTERA. 
Wings four, membranaceous : mouth with maxilla, and some of them 
likewise a tongue. Between the large eyes they have generally three 
stemmata. At the extremity of the abdomen the females of several of 
the genera have an aculeus 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 
