388 Sir S. S. Saunders on Fig-Insects 



the base of the projecting fifth. Moreover, in assigning 

 these constricted segments to the ovipositor, the super- 

 addition of the overlapping flap, covering the base of 

 the sheaths but not attached thereto, would seem wholly 

 inexplicable ; while the presence of two lateral spiracles 

 towards its apex, together with the usual apical styles 

 and the subjacent acuminate process porrected beyond 

 (ventral ?) — as shown in Plate XVIII. , figures 1 d, f, g, h 

 — constitute additional links in the chain of evidence 

 identifying this with the terminal abdominal segment. 



In a posthumous paper by Walker on " Insects 

 destructive to the Fig in India," which appeared in the 

 'Entomologist' (vol. viii., p. 17 ; Jan., 1875), he describes 

 a nearly-allied genus (Polanisa) as having the " abdomen 

 more than twice the length of the thorax, tapering to 

 nearly half its length, compressed and aculeiform from 

 thence to its tip : oviduct longer than the body, emerg- 

 ing from the base of the abdomen ; sheaths proceeding 

 from the apex of the abdomen, slightly incrassated." He 

 subjoins that " the form of the abdomen indicates that 

 in the act of oviposition the apical half of it is inserted, 

 as well as the sheaths of the ovipositor." " One speci- 

 men " (no longer traceable) is stated to have been 

 obtained — from what source, however, or from what 

 species of fig, or in what part of India, he does not 

 mention ; — but the terminal segments, which in Idarnes 

 transiens he ascribed to the oviduct, are here assigned to 

 the abdomen. In fact the elongate tubiform segment 

 possesses no duct specially available for oviposition, the 

 terebra being subsequently received from below and 

 virtually independent thereof; the former apparently 

 analogous to Burmeister's " vagina tubiformis," defined 

 by him as " a mere continuation of the abdomen," and 

 terminating in proximity to the bipartite sheath or valves 

 of the oviduct (his "vagina bivalvis "), "into which," as 

 he says, " the vagina tubiformis opens " ; supplemented 

 by the "valves corresponding with the last abdominal 

 segment," which " appear as the cover both above and 

 below at the base of the vagina bivalvis itself" (' Manual,' 

 Shuckard's Trans., p. 194). 



The following antipodean species of this genus, much 

 smaller than the others referred to, entirely corresponds 

 therewith in characteristic details : — 



