GYMNOCOCCUS AGAV1UM. 



205 



seven joints, highly chitinous, with very distinct articu- 

 lations ; fifth joint with a spine ; apical joint with a 

 few short hairs. Legs short, highly chitinised ; tarsi 

 longer than the tibiae. Mentum biarticulate. Anal 

 lobes rudimentary, each indicated by a long seta. Anal 

 orifice (Fig. 6, b) with six hairs ; the chitinous portion 

 of the " ring " in three equal parts, each separated 

 from the other ; orifice crescent-shaped as in the genus 

 Coccus. Dermis (Fig. 6, c) above with numerous short 

 conical spines. 



Long, 2-3 mm. 



" Male blackish-brown, shining ; head broadly pro- 



FIG. 6. Gymnococcus agavium, Doug, a, antenna of adult ? ; b, anal 

 orifice of adult ? ; c, dermal spines of adult ? ; d, antenna of the 

 larva. (All highly magnified.) 



duced anteriorly ; antennae long, slender, piceous, with 

 projecting simple hairs; of ten joints, the first two 

 thick, first shortest of all, narrow at base ; second 

 oval, twice as long as the last ; third to fifth thinnest, 

 third longest of all; fourth and fifth one fourth 

 shorter, subequal ; sixth to tenth stouter ; sixth as long 

 as second ; seventh shorter ; eighth and ninth still 

 shorter, subequal; tenth shorter than ninth, conical. 

 Eyes simple, and ocellus vertical, and close to the 



