THE HEAD. 67 



PL VII. f. 20) ; LAMELLATE (cap. lamelhitmn), when the joints of 

 the knob extend on one side into broad leaves (PI. VII. f. 21, 

 Melolontlia) ; TUNICATE (cap. tunicalum), when each successive 

 joint is buried in the preceding funnel-shaped one (PL VIII. f. 1, 

 Lethrus} ; INFLATED (cap. iiiflatum), when the knob has the form of 

 a broad bladder (PL VIII. f. 2, Paussns) ; SPLIT (cap. jissuni), when 

 the joints upon one side are divided as by incisures (PL VIII. f. 3, 

 Lucaims). 



HOOKED (imcinatce], when the last joint bends back upon the 

 preceding (PL VIII. f. 4, the male of Odynerus}. 



NODOSE (nodosce, PL VIII. f. 5), are those antennae which have 

 their intermediate and terminal joints thicker than the remainder 

 (many Curculios). 



ANGUSTATE (angustatte), on the contrary, when the middle joints 

 are thinner than at the beginning or the end (PL VIII. f. 6, Asilus). 



SETIGEROUS (seligerte), are such whose terminal joint has upon its 

 upper side a fine BRISTLE (seta). The bristle is either SIMPLE (sim- 

 plex, PL VIII. f. 7), or PLUMOSE (plumosa, PL VIII. f. 8, Volucdla), 

 when upon each side it sends forth fine and delicate branches. These 

 forms are in general only found in the three-jointed antennae of the 

 Diptera, the very various forms of which are shown in the figures 

 6 to 17 of the eighth plate. 



MUCRONATE (rnucronatts), are those whose last thick joint suddenly 

 terminates in a sharp point (PL VIII. f. 18, Empis). 



AURICULATE (auriculatce), are those antenna? whose inferior joint 

 is distended into a concave plate, not unlike the shell of an ear, and 

 which partially covers the rest (PL VIII. f. 20, Gyrinus ; f. 19, 

 Parnus). 



IRREGULAR (irregulares), lastly, are all such antennae, all or several 

 of the joints of which aue dissimilar in form to eacli other (PL VIII. 

 f. 22, Cerocoma ; f. 30, Agaon). 



4. Number of the Joints, 



Antennas which consist of but ONE joint are called EXARTICULATE 

 (exarticulat<z) ; others, which have but few joints, are named from 

 their number, as biarticulate, with TWO ; inarticulate, with THREE 

 joints, &c. But those whose joints are very numerous are called 

 MULTIARTICULATE (miilliarticiila/<v). 



F2 



