3+0 ORISMOLOGY. 
by the shield of the prothorax. — Ex. Hymeno- 
ptera. 
2. Covered {Tectum). When it is quite concealed by 
the prothorax. 
3. Ar'eate (Areatum). When it is larger than the 
prothorax, and terminates towards the wings in 
two oblique areas, inclosed by a ridge often crown- 
ed anteriorly with little teeth. — Ex. Libellulina. 
Plate IX. Fig. 7- g', a. N.B. The space between 
these areas isjitted with a membrane capable of ten- 
sion and relaxation, which in fight causes them to 
approach to and recede from each other. 
4-. Amplectent (Amplecte?is). When posteriorly it is 
so curved as to form a large sinus which embraces 
the dorsolum. — Ex. Vespa L. Plate IX. Fig. 
11. g-. 
5. Phonetic (Phoneticnm), When its posterior an- 
gles, approaching the wings, cover the vocal spira- 
cles a . — Ex. Hymenoptera. 
(S. DORSOLUM. 
1. Thoraciform ( Thoraciforme ). When it forms 
the principal part of the upper surface of the 
trunk. — Ex. Bombus, Apis, Vespa &c. Plate IX. 
Fig. 11. r. 
y. SCUTEIXUM. 
1. Distinct (Distmctum). When it is separated from 
the dorsolum by a suture. — Ex. Hymenoptera, 
Diptera. Plate IX. Fig. 11, 19, &c. k'. 
2. Coalite (Coalitum). When it is not separated 
a Chabrier Sur le Vol dcs Insectes. Mem. du Mux. t. viii. 55. 
