ORDERS OF INSECTS. 177 
some writers. They are, as a general rule, remarkable for their 
hard chitinous skin, their glittering, often metallic, colours, and 
their voracious habits, though many of them feed upon vegetable 
matters. 
Fig. g2.—Coleoptera. The common Cockchafer (Welolontha vulgaris), with the 
elytra closed, and in flight. 
Of the enormous number of known Beetles, the only one 
which can be said to be of any decided use to man is the so- 
called “ Blister-beetle,” or “ Spanish Fly” (Cantharis vesicatoria) 
This handsome insect is a native of Southern Europe, especially 
of Italy, Spain, and France, and lives upon the leaves of the 
ash, lilac, elder, and poplar. It is largely collected and exported 
for medicinal purposes, as it yields one of the most generally 
used and efficient of blisters. 
TABULAR VIEW OF THE DIVISIONS OF THE ANNULOSA. 
Division A. ANARTHROPODA.—Locomotive appendages not dis- 
tinctly jointed or articulated to the body. 
Ciass I, GEPHYREA,—£x. Spoon-worms (Sipunculus). 
CLAsSs IJ. ANNELIDA. 
Order a. Hirudinea.— Ex. Leeches (Hirudo). 
Order 46. Oligocheta.—x, Earth-worms (Lumbricus). 
Order ¢. Tudbicola,—Ex. Tube-worms (Serpula). 
Order @. Errantia.—Ex. Sand-worms (Nereis). 
Cuass III. CHATOGNATHA.—£x, Sagitta. 
M 
