NEUROPTERA. 65 
to all the tarsi, and the anterior extremity of their head pro- 
longed and narrowed in the form cf a rostrum or proboscis. 
They constitute the genus 
Panorpa, Lin. Fab. 
Where the antennz are setaceous and inserted between the eyes; the 
clypeus is prolonged into a conical, corneous lamina, arched above 
to cover the mouth, and the mandibles, maxille and labium are 
almost linear. They have from four to six short, filiform palpi; in 
those of the maxillx I could distinctly perceive but four joints. 
Their body is elongated, the head vertical, the first segment of 
the trunk usually very small, in the form of a collar, and the abdo- 
men conical or almost cylindrical. 
There is much difference between the two sexes in several species. 
Their metamorphoses have not yet been observed. ad 
In some, and the greater number, the naked or exposed portion 
of the thorax is formed of two segments, the first of which is the 
smallest. Both sexes are winged, and the wings are longer than 
the abdomen, adapted for flight, oval or linear, but not narrowed 
towards the extremity or subulate. Such are those which compose 
the 
NemoptTera, Lat. Oliv. 
Where the superior wings are distant, almost oval, and very finely 
réticulated; the inferior ones are very long and linear; no simple eyes. 
The abdomen is nearly similar in form in both sexes. They ap- 
pear to have six palpi, and hitherto seem to have been only observed 
in the most southern parts of Europe, in Africa, and in the adjacent 
countries of Asia(1). 
Bittracus, Lat. 
Where the four wings are equal and laid horizontally on the body. 
They are furnished with simple eyes; the abdomen is almost similar 
in both sexes, and the legs are very long; the tarsi are terminated 
by asingle hook and are destitute of pellets(2). 
—— 
(1) Lat.,.Gen. Crust. et Insect., II, p. 186; Oliv., Encye. Méthod., article 
Némoptére. Doctor Leach calls it Monopteryx; he has figured two species, Jusz- 
tanica and africana, in his Zoological Miscellany, Ixxxy. 
(2) Lat., Gen. Crust. et Insect. 
Vout. [V.—I 
