202 INSECTA. 
They comprise the genus 
Peria, Geoff. 
Their body is elongated, narrow, and flattened; the head is tolerably 
large, the antennz are setaceous, and the maxillary palpi very salient. 
The first segment of their trunk is nearly square, and the wings are 
crossed and laid horizontally on the body; the abdomen terminates as 
usual by two articulated sete. 
Their larve are aquatic, and inhabit sheaths or cases, which they 
construct in the manner of those formed by the Insects of the ensu- 
ing family, and in which they pass into the state of nymphs. They 
undergo their ultimate metamorphosis in the commencement of 
spring. 
Nevumora, Lat. 
The Nemoure differ from the Perle proper in their very apparent 
labrum, corneous mandibles, the almost equal length of the joints of 
their tarsi, and in the sete cf the extremity of the abdomen, which 
ure almost wanting *. 
P. bicaudata; Phryganea bicaudata, L.; Geoff., Insect., II, 
xiii, 2. Eight lines in length; of an obscure brown, with a 
yellow line along the middle of the head and thorax; nervures of 
the wings brown; sete of the tail almost as long as the antenne. 
Common in Europe in the spring, along the banks of rivers f. 
FAMILY ITI. 
PLICIPENNESt. 
In this family the mandibles are wanting, and the inferior wings 
are usually wider than the others, and plaited longitudinally. It is 
formed of the genus 
PuryGanea, Lin. Fab. 
These Neuroptera, at a first glance, have the appearance of little 
Phalzenz, and hence the name of Mouches papillonacées or papillo- 
naceous flies, bestowed upon them by Reaumur. De Geer even ob- 
serves that the internal organization of their larve bears the closest 
resemblance to that of caterpillars. Their head is small, and presents 
two cetaceous antennze, usually very long and salient; rounded and 
salient eyes; two ocelli on the forehead; a curved or conical labrum; 
four palpi, those of the maxillee commonly very long, filiform, or 
* See Lat., Gen. Crust. et Insect., III, p. 210; Oliv., Encye. Méthod., article 
Némoure; Phryganea nebulosa, L., &c. 
+ Geoff. and Lat., Ibid. 
t In the systems of Messrs. Kirby and Leach, this family forms the order of the 
TRICHOPTERA, which would connect itself with that of the Lepidoptera, through the 
Tinee. But as we naturally pass from the Plicipennes to the Perle, by following 
the series of mutual! relations, we should be forced to terminate the Neuroptera with 
the Libellule and Ephemere, whose organization and habits differ greatly from thos 
of the Hymenoptera, which according to this method follow the Neuioptera. Th 
Libellule and other Neuroptera, which in our system come directly after, appear t¢ 
us to be those which approximate most nearly to the Orthoptera. 
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