INSECTS. 
oi3 
the wings with an eye-like spot. Inhabits the south ot Eu 
rope. 
ORDER X.—STREPSIPTERA. 
With two naked membranous wings, accompanied by two 
balancers, which are longitudinally folded, forming nearly the 
quadrant of a circle; anal opening styliferous; transformation 
incomplete. 
Genus XENOS.— Kirby. 
Generic Character .—With antennae triarticulate at the 
base, separated into two, slender, elongated, semicylindrical 
equal branches, destitute of joints. 
Xenos Peckii _ Peck’s Xenos. 
Plate XCIX. tig. 11. 
Blackish fuscous ; antennae with semicircular branches, dotted 
with white ; tarsi fuscous. Inhabits America. 
ORDER IX.—DIPTERA. 
Provided with six feet; two membranaceous extended wings, 
under each a balancer, in most species; mouth composed ot a 
sucker, consisting of a variable number of scaly setaceous 
pieces, either inclosed in the upper furrow of a sheath, or inar- 
ticulated proboscis, and terminated by two lips, or cased in one 
or two plates. 
Section I. 
Head distinct from the thorax, large, or middle-sized; hooks 
of the tarsi simple or one toothed ; sucker enveloped in a sheath ; 
larva having the body and cocoon, when it is formed of the skin 
of the caterpillar, always annulated its whole length. 
TRIBE I.-NEMOCERA. 
Antenna? having at least six joints; but the ordinary number 
fourteen or sixteen ; the larva? with a scaly head, and changing 
their skin before passing into the pupa condition. 
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