SOME SOUTH INDIAN INSECTS, ETC. 



[( ll \I\ I. 



pec Una te, or comb-like, when the jointN have long processes 



jutting out sideways, like the teeth of a comb. These processes may 



I on iinc side only, when the antenna is called unipectiriate, or 



on both sides, when it is called bipectinate. When these branches 



are themselves fringed with hair the antennae are said to be plumose, 



clavate, or clublike, when the joints become gradually broader 

 towards the tip. mi that the whole antenna assumes the form of a 

 club, 



capitate, or knobbed, when the terminal joint or joints form a 

 ting club, as in most Butterflies, 



lamellate, when the terminal knob is composed of expansile 

 broad, flat leaves <>r plates, as in Cockchafers. 



The antenna; are often different in form in the two sexes, those 

 of the male (many moths, Gongy I us) being often extensively branched 

 whilst the same organs in the female are simple. The object ol 

 the branching in these cases is to secure a maximum area of 

 sensitive surface t>>r the reception of sexual odours diffused by the 

 female, and this end is attained in more generalized insects [eg., 

 Adelidae) by simple repetition of joints so that the antenna is 

 many times the length of the whole body of the male insect. 



7 \>7~ 8 



rious forms ol Eyes in Insects. (Original.) 

 1, Xylocopa iridipemiis (Hymenopl mpound Eye, oc. Ocelli: 



2, Pantala flavescens (Odonata) ; 3, Tabanus striatus (Diptera), male, and 

 t. female of the same ; 5. Teleopsis sykesit (Diopsida:) ; 6, Orectochilus semi- 

 vestitus (Gyrinida?) ; 7, 8, Trisopsis olea (Cecidomyiadae), frontal and lateral 

 iicw >. I Alter Ki< fl 



