336 ORISMOLOGY. 



3. CERVICULATE (Cerviculatus). When the prothorax 

 is elongate, attenuate, and distinguished from the 

 Antepectus by no suture ; so as to form a distinct 

 and usually long necJc. PLATE III. FIG. 6. 



4-. EVANESCENT (Evanescens). When no distinct pro- 

 thorax is discoverable or it is only represented by 

 membrane. Ex. Most Hymenoptera, Diptcra, &c. 



5. MARGIN ATE (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, &c. 



6. IMMARGINATE (Immarginatus}. When it has no 



such margin. Ex. The Rhyncophorous beetles. 



7. EXPLANATE (Explanatus). When its sides are so 



depressed and dilated as to form a broad margin. 

 Ex. Necrophorus, Silpha. 



8. EM ARGINATE (Emarginatus}. 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. 



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. Helens. 



11. CLYPEATE (Clypeatus). When it quite covers and 



overshadows the head. Ex. Lampyris, Cassida, 

 Cossyphus. 



12. CUCULLATE (Cucullatus). When it is elevated into 



a kind of ventricose cowl or hood which receives 



