THE HEAD. 



n. Equal Antenna. 



SETACEOUS (setacea, PL VII. f. 1), are such which very gradually 

 decrease, becoming pointed at the apex (Locust a, Fab.). 



SETIFORM (setiformes, PI. VII. f. 2), when it resembles a slender, 

 short bristle which springs from a thicker basal joint (Libellula}. This 

 form is distinguished from the SUBULATE (subulata, PI. VII. f. 3), by 

 the latter being shorter, thicker, and slightly bent (Leptis"). 



FILIFORM {jiliformes, PI. VII. f. 4), when of the same thickness 

 throughout, and composed of cylindrical joints (Carabus}. 



MONILIFORM (moniliformes, PL VII. f. 5), is when the joints are 

 globose (Tenebrio). 



ENSIFORM (ensiformes, PL VII. f. 6 h when the joincs are com- 

 pressed, and have a sharp edge on each side (Truxalis}. 



FALCIFORM (falciform^, PL VII. f. 7), when arched like a sickle. 



DENTATE (dentatcs, PL VII. f. 8), when their joints are armed with 

 slight, pointed spines (Stenochorus). 



SERRATE (serrata, PL VII. f. 9), when the joints are triangular, 

 and are so arranged that the prominent angle is placed anteriorly, and 

 inclines downwards (Elate)-}. BISERRATE (biserratai), when a similar 

 angle is also placed upwards, and, when so, the point of insertion of the 

 joints is not at the superior angle, but at the centre of the base of the 

 triangle. In the latter case, the joints of the antennae form an isosceles 

 triangle, whereas in the former they are more or less rectangular. 



IMBRICATE (imbricate, PL VII. f. 10), is when the joints are 

 conical, but deeply excavated, so that one joint is inserted half way 

 within the other (Prionus}. 



PECTINATE (pectinate, PL VII. f. 11), when the joints have long 

 processes on one side, like the teeth of a comb. BIPECTINATE 

 (bipectinatce), when such a process issues from each side of the joint 

 (Lopkyrus} ; or DOUBLY PECTINATED (duplicato-pectinatce, PL VII. 

 f. 12), when there are two processes on each side of the joints 

 (Ctcnophora). CIRRATE (cirratce, PL VII. f. 13), when the branches 

 of such doubly or singly pectinated antennae are very long and 

 curled, and sometimes, but not always, fringed with hair. DISTICHOUS 

 (distichtz'), when the processes originate from the apex of the joint, 

 and do not incline at right angles towards the sides, but bend for- 

 ward at acute angles. FLABELLATE ( fiabellatce, PL VII. f. 14), 



F 



