Australian Termite, Masloteruws darwinensis . 141 



of this primitive type of ovipositor in Mastolennes furnishes 

 further evidence of the rather close relationship between 

 Gryllohlatta and the termites. 



In the winged " males " of Masiolermes there are eight 

 apparent abdominal sternites, as was mentioned above ; 

 but since the apparent first sternite is in reality the sternite 

 of the actual second abdominal segment (the sternal plate 

 of the first segment being atrophied, or so greatly reduced 

 as to be no longer readily detected), the apparent eighth 

 sternite, labelled " ha " in PI. IV, tigs. 2 and 4, represents the 

 sternum of the actual ninth abdominal segment. In the 

 males of Grylloblatla eampodeifornm Walker, recently figured 

 by Dr. Walker {I. c), the hypandrium, or sternite of the 

 ninth abdoniinal segment (situated below the genital 

 apparatus of the male) bears a pair of distinct structures, 

 the coxites^ or styligers, to which the styli are attached. 

 In the winged male of Mastofermes (fig. 4) the styligers " sg " 

 (which may or may not represent the coxal segment of a 

 limb, since the styli themselves are sometimes secondarily 

 segmented) have become greatly reduced, and are partially 

 united with the hypandrium " ha," but traces of them are 

 still retained. A similar condition occurs in the cockroach 

 Cryptocercas, shown in fig. 92 of the paper on the genitaha 

 of male insects (Bulletin of the Brooklyn Ent. Soc, vol. 

 xiii, 1918) ; but I did not realise the true significance of 

 the styh-laearing structures in this insect (*'. e. the homo- 

 logues of the styligers " sg " of figs. 2, 4, etc.) until Dr. 

 Walker had published his figures of the condition occurring 

 in the prinjitive insect Gryllohlatta. 



In connection with the discussion of the styli, " s," and 

 the styhgers, " sg," I would call attention to the fact that 

 if one compares Di'. Walker's figure 2 (Ca]i. Ent. vol. li, 

 plate viii) of the ventral region of the terminal abdominal 

 segments of a male Gryllohlatta with my figure 34 (Bull. 

 Brooklyn Ent. Soc, vol. xiii, plate 4) of the same region 

 of a male Enihia, the resemblance between the two is very 

 striking. The outline and relative size of the ninth sternite 

 are very similar in both insects, and the so-called two- 

 jointed cerci of Entbia are remaikably similar to the two- 

 jointed styli {i. e. the styli with their basal structures the 

 coxites or styligers) of Grylloblatla, not only in position, 

 but in the number and character of their component 

 parts. Dr. Walker, however, maintains that these two 

 structures are not homologous in the insects in question, 



