DJASPINJ:: LARVA. 73 



the anal opening, two caudal setae, lobes, plates, and 

 spines. Eyes distinct. The rostrum, comparatively 

 large, resembles that of the female. Legs (Fig. 10) 

 short, consisting of five parts ; the monomerous tarsus 

 is furnished with a simple claw and four knobbed hairs 

 (digitules). 



SECOND-STAGE FEMALE. 

 (PL XXV, fig. 11 ; PL XXIX, fig. 8.) 



Closely resembles the adult insect, but is not known 

 to possess the grouped circumgenital glands. In the 

 genus Aonidia, Gymnaspis, and Fiorinia, the insect 

 attains its greatest dimensions in this stage, and its 

 moulted skin, enclosing the adult insect, chiefly or en- 

 tirely forms the puparium. In Aspidiotus, Diaspis, 

 Chionaspis, etc., the moult takes place when the insect 

 is very small, and the cast skin (exuviae) forms but a 

 small portion of the puparium. 



ADULT FEMALE. 



(PL I, figs. 3, 9, 10 ; PL IX, figs. 4, 5 ; PL XXI, figs. 

 9, 10, 11; PL XXV, figs. 1, 10; PL XXXII, figs. 

 1, 3, and elsewhere.) 



Apodous, and with rudimentary antennae, consisting 

 of a minute tubercle and one or more stiff hairs. 



The variation in the form of the insects may be best 

 gathered from a study of the figures on the plates. 

 The rostrum is placed on the ventral surface towards 

 the anterior margin ; it consists of three distinct parts : 

 the basal portion, a large complicated chitinous struc- 

 ture, the second, the true mentum, a minute mono- 

 merous process to which is attached the long sucking 

 apparatus consisting of four long, highly chitinised 

 filaments. These latter form a retractile loop, which, 

 when prepared for microscopical study, frequently 



