70 INSECTA. 
The same character is presented in the genus 
NymrueEs, Leach, 
Established on certain Insects from New Holland; but here the 
antenne are filiform and shorter(1). 
In the others the first segment of the thorax is large, and 
the wings are laid horizontally on the body; the palpi are 
filiform, and the last jeint is conical or almost cylindrical, and 
frequently shorter than the preceding one. ‘The larve are 
aquatic. 
Fabricius unites them with the species of the genus Perla 
of Geoffroy, but which are removed from them by the num- 
ber of joints in their tarsi, under the generic name of 
SEMBLIS, Fab. 
Which is composed of the following subgenera. 
Corypatts, Lat. 
Distinguished by the mandibles of the male which are very large 
and resemble horns(2). 
CuauLiopEs, Lat. 
Where the antennz are pectinated(3). 
Siaris, Lat. 
Where the mandibles are moderate, as in the latter, and the an- 
tennz simple as in Corydalis, and distinguished from the two pre- 
ceding ones by the tectiform disposition of the wings. To this sub- 
genus belongs the P 
ee 
(1) Nymphes myrmeleonides, Leach, Zool. Miscell., xlv. Perhaps it may have 
six palpi, and in that case it belongs to the preceding division. 
(2) Lat., Gen. Crust. et Insect., Ill, p. 199. 
(S) Ibid., p. 198. 
