( 0X1 ) 



the apical third is of a rough external texture caused by a 

 close covering of minute hairs. 



It will thus be seen that the genitalia of these exotic genera 

 are quite confirmatory in their characteristics of those of the 

 Palaearctic region. 



The Aegeridae must be briefly referred to, though I have 

 already figured several specimens in these Transactions (1914, 

 pp. 325-326, PI. LXII, figs. 28-30), for I was then considering 

 quite another point of view than that we are now dealing with. 

 The family retains very primitive characters that are well seen 

 in 



Aegeria ichneumoniformis, S. V. 



The cingula (and it is quite typical of the genus) has evidently 

 not progressed at all, except perhaps in the long saccus and 

 the slight proportions of the cingula itself; the sternite 

 portion of it is erect from the venter and quite slight, then 

 suddenly a sharp articulation on a short broadish arm occurs 

 and the harpago is articulated to the end of this arm; the 

 cingula then ascends again at the rear in a broader prolongation 

 to the tegumen, which is ample but decidedly primitive, the 

 beautiful brush is well developed, together with the recess 

 into which it can be withdrawn and also its covering mem- 

 brane; the elliptical harpago is densely furnished with the 

 spatulate hairs ; the aedoeagal trough is emitted from the very 

 base of the cingula and is long, forming a support also for the 

 harpagones to rest on; the aedceagus is long and very narrow. 



Trochilium crabroniformis, Lewin, 



is more advanced in its cingula, which is not definitely 

 articulated, but the sternite and tergite sections are evidenced 

 in the recessed arms ; the tegumen is an ample hood with a 

 bifid uncal extremity, which is supplied with strong spines; 

 the large harpagones with their frontal rows of powerful spines 

 would appear to show but little progress; the ?edceagus is 

 short and broad. 



It will be seen from these two genera that whilst this family 

 is without doubt specialised in these organs, yet it is a special- 

 isation that must be of very ancient date, and that apparently 

 there has been but little development towards simplicity. 



