INSECTS. 
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tractile sucker ; or having two membranous lips, provided with 
two hooked mandibles. 
TRIBE I.-MANDIBULATA. 
Provided with mandibles, two lips, and jaws. 
Genus 1.—RICINUS.— Latreille. 
Generic Character .—Mouth placed below, externally com¬ 
posed of two lips, and two hooked mandibles; tarsi jointed, and 
terminated by two equal hooks; antennae thickest at their 
points. 
Ricinus corvicoracis .— The Crow Louse. 
Plate XCVII. fig. 8. 
Back with oblique brown bands along its margins. Infests 
the crow. 
TRIBE II.-SIPHUNCULATA. 
Without mandibles; the mouth consisting of a rostrum, from 
which the animal can protrude a sucker at pleasure. 
Genus 2. —PEDICULUS.— Linnceus. 
Generic Character. — With an apterous body, and distinct 
head; six feet articulated on the thorax; two antemue; two 
eyes, having distinct facets; mouth consisting of a rostrum, en¬ 
veloping an extensile sucker ; destitute of mandibles or jaws. 
Pediculus coturnicis. — The Quail Louse. 
Plate XCVII. fig. 9. 
White; every segment furnished with three hairs on each side ; 
legs hairy. Infests the quail. 
ORDER III.—SYPHONAPTERA. 
Body compressed ; mouth provided with a sucker of two 
pieces, inclosed between articulated laminae, forming a cylindri¬ 
cal or conical rostrum by their union, the base of which is cov¬ 
ered with scales. This order consists of but one genus. 
