BY J. J. FLETCHER. 485 



Of the (spirit) specimens from Mt. Kosciusko some are 

 variously bent making it difficult to measure them ; allowing for 

 this as nearly as possible they may be said to vary in length 

 from about 9-18 mm., not including the antennae ; with two excep- 

 tions the smaller ones are males, which average about 10 mm. long, 

 the two largest being about 13 and 14 mm. respectively ; the 

 two young females however are easily distinguishable from the 

 males by the characters of the genital papilla and aperture, and 

 the absence of papillae on the legs. Of the five specimens from 

 Dunoon two females were, apart from their greater size, similarly 

 readily distinguishable from three males. 



The genital papilla of the female is very frequently remarkably 

 prominent (more especially post-mortem) and bears a longitudinally 

 disposed slit ; in the large dark specimen from the Blue Mts. 

 however, as occasionally happens, the genital papilla is not rela- 

 tively more prominent than is usual in the males. In the latter 

 each lip of the otherwise longitudinal slit is usually notched, so that 

 the aperture appears cruciform, and with a conspicuous large and 

 one or two smaller blue papillse in each re-entering angle generally 

 visible in favourably preserved specimens gives a very characteristic 

 appearance. In addition to the three differential sexual characters 

 in respect of size, the characters of the genital papilla and aper- 

 ture, and the occurrence of papillae on certain of the legs, which 

 have already been mentioned, and which were first pointed out by 

 Mr. Sedgwick, I am able now to mention another in the occurrence 

 in the males of a pair of pores, sometimes slightly crescentic in 

 shape, one on either side of and close to the median ventral line 

 between the genital papilla and the anus but nearer the latter ; I 

 do not at present know the significance of these pores as my 

 sections are not good enough to enable me to follow them up ; 

 possibly they may be the openings of the ducts of accessory 

 glands. I do not know of any other external differences chai'ac- 

 teristic of the sexes. 



On the ventral surface is a median series of pale areas which 

 seem pretty constantly present (though they are not visible in one 



