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BRITISH BEETLES. 
Lepidopteea. Wings four (sometimes rudimentary 
or absent in the female), more or less thickly clothed 
with scales ; mouth haustellate or suctorial ; metamor- 
phoses complete. 
Neukoptera. Wings four in number, membranous, 
and for the most part densely reticulate, more or less 
clothed with hairs, but without true scales ; mouth 
mandibulate ; metamorphoses complete, but the pupa 
as in the Coleoptera and Hymenoptera. 
The Trichoptera (or Caddis-flies) have the mouth 
parts rudimentary (except the palpi) and the clothing 
of hairs very distinct ; with one or two exceptions 
they are aquatic in their habits. 
The Planipennia have strongly-developed mandibu- 
late mouths, the wings more thickly reticulate, and the 
clothing of hairs absent or almost wanting ; the best 
known are the Ant-Lions, the Lacewing-flies, and the 
Panorpidaa or Scorpion-flies. 
Orthoptera. The arrangement of this group has 
been much disputed ; as here constituted it includes 
several divisions that have ordinarily been considered 
to belong to the Neuroptera ; the group is defined by 
Mr. McLachlan as follows : “ Typically with four 
densely reticulate unequal wings (or apterous), whereof 
the anterior are more or less coriaceous, the posterior 
folded under them and membranous ; in the most 
typical groups they are deflexed and closely applied to 
the body longitudinally in repose. Mouth mandibulate. 
Metamorphoses incomplete ; ” in the first group, how- 
ever, which are separated from the true Neuroptera on 
the ground of their incomplete metamorphosis, and are 
termed Pseudo-Neuroptera, all four wings are equally 
membranous ; this group includes the Dragon-flies, 
