a Family of Thysanura. 373 
the remarkable framework for the support of the organs of the 
mouth, which he has probably not observed, as he does not 
mention it. I have distinctly observed the appendages on the 
underside of the abdomen, corresponding to those of the Lepis- 
mez, which Mr. Haliday failed to discover on his specimens ; 
and I interpret the two chitinized plates on the underside of the 
tenth abdomen-ring as the separated halves of the ventral shield 
—not, with Mr. Haliday, as the inflected margins of the dorsal 
shield. Several minor points of divergence will appear from 
the above description. 
CamMpopEa, Westw. 
Cerci longi, multiarticulati, filiformes. 
Segmentum pzenultimum longitudine segmenti ultimi, scuto 
_ventrali integro. 
Mandibule apice compresse, dentate, appendice lamelliformi 
instructe. 
Mala interior maxille in dentes octo incisa. 
Palpi maxillares inarticulati. 
Palpi labiales breves, fere membranacei, setiferi, duas longas 
setas ensiformes apice gerentes. 
Verruce duz setiferze pone labium. 
Antenne filiformes vel submoniliformes. 
Oculi nulli (vel seni congregati evanidi ?). 
_ Unguiculi curvati, ad basin processibus binis longis tenuibus 
curvatis instructis. 
Spiracula terna. 
The mandibles are shorter and more powerful than in Japyz; 
their apex is more compressed, almost cuneiform, with the ante- 
rior edge oblique, dentate, and a sort of grinding-surface along 
_ the inner edge of the apex. At the base of this grinding-surface 
a small, thin, triangular lobe, with deeply incised fore margin, 
articulates with the mandible. The muscles of the mandibles 
are also upon the whole more powerful than in Japyz, and they 
are disposed as in that genus. 
The maxille are somewhat less complicated than in Japyz ; 
the inner lobe is less elegant ; the subsidiary lobes are more in 
number, but not themselves subdivided, the two outer ones 
being the most powerful, the others with thin foliaceous apices. 
The outer maxillary lobe is, as in Japyz, foliaceous, with a conical 
protuberance on the upperside. The palpus is inarticulate, 
and in a great measure united with the maxilla without distinct 
palpiger. 
‘The lingua is large, oval; the paraglossz large and flat ; they 
cover the lingua almost entirely from above, and surround also 
