ORISMOLOGY. 397 
other pieces of the trunk. Ex. ZLibellulina. 
Prats IX. Fie. 6. 
3. CrervicuLate (Cerviculatus). When the prothorax 
is elongate, attenuate, and distinguished from the 
Antepectus by no suture; so as to form a distinct 
and usually long neck. Puare III. Fie. 6. 
4. EVANESCENT (Evanescens). When no distinct pro- 
thorax is discoverable or it is only represented by 
membrane. Ex. Most Hymenoptera, Diptera, &c. 
. Mareinate (Marginatus). When an impressed 
line or channel separates the edge of the protho- 
rax from the rest of its surface, and so forms a 
margin. Ex. Harpalus Latr. &c. 
6. ImmarGinaTE (Immarginatus). When it has no 
Or 
such margin. Ex. Curculio L. 
ExpianateE (Lzplanatus). When its sides are so 
depressed and dilated as to form a broad margin. 
Ex. Necrophorus. Silpha. 
8. EmarGinaTE (Lmarginatus). When a segment of 
a circle is taken out of its anterior part for the re- 
ception of the head. 
9. AmBient (Ambiens). When this sinus is so large 
as to receive the whole head. Ex. Chilocorus 
Leach. 
10. CircUMAMBIENT (Circumambiens). When its sides 
are elongated anteriorly and curve inwards, their 
ends lapping over each other and the head, so as 
to form a circle round the posterior part of the 
latter, and leave a space open for the eyes to see 
objects above them. Ex. Heleus. 
11. CrypeatE (Clypeatus). When it quite covers and 
overshadows the head. Ex. Lampyris. Cassida. 
Cossyphus. 
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