222 Dr. David Sharp's Studies in Rhjnchojyhora. 



fl= flagell'um = transfer apparatus or a part thereof. 



fo = functional orifice. 



im, see cm. 



is = sac, usually concealed in median lobe. 



ml = median lobe. 



mo = orifice of median lobe = spot from which the sac is exserted. 



ms. = struts of median lobe. 



sp = spiculum gastrale. 



ta = transfer apparatus or a part of such : see fl as above, and x, 



y, below. 

 tg = tegmen and 

 (s = tegminal strut. 

 x and y = parts of accessory apparatus, presumed to be portions of 



transfer apparatus. 



Fig. 1. Diagram of the arrangement of the genital tube in repose; 

 see p. 2 1 0. 



2. The same fully extended. The lettering is the same as in 

 the other figures. 



3. Otiorrhyrichus difficilis (from Piedmont), median lobe. 



4. 0. difficilis, sac extended and tegmen in situ : this is a fair 

 average of the Otiorrhynchid aedeagus, except that the sac 

 is longer than usual. 



5. Polycieis plumbeus (Pretoria), lateral view with sac imper- 

 fectly extended and duct still visible in it, tegmen cut aw ay : 

 the pieces at the base of the sac assist in the eversion thereof, 

 and may correspond to the " Endplatten " (Iindeman). 



0. Polycieis plumbeus (another specimen, from Cape Good Hope), 

 transfer apparatus. 



7. Isomerinthus, sp. n. (Amboina, P. Muir). Profile: enormous 

 development of sac, which can scarcely be compressed into 

 the median lobe which is enlarged towards the apex; tegmen 

 taken off. 



8. Another specimen of the same species (Amboina, F. Muir) 

 with the sac partially everted, and injected. 



!». Trigonops (? Heteroglymma), *\>. (New Guinea). Another 

 Otiorrhynchid allied to fig. 8, but sac not extended and 

 probably very different, the median lobe being differently 

 shaped, probably conformably with the difference in the 

 sacs : x and y are seen through the wall of the median lobe, 

 and one or both are probably accessory parts of the transfer 

 apparatus, which is in this species very slender at the tip, an 

 intermediate between a " whip-nagellum '" and a sessile 

 transfer apparatus (shown in fig. (>). 



