592 Mr. D. Sharp and Mr. F. Muir on the Comparative 



apex. Basal-piece very large, forming a long tube, the dorsal part 

 formed by a long, curved sclerite and the ventral surface by a long 

 narrow one {rp). Internal sac long, thin at apex and supported by a 

 chitin strip (b). 



Frnlistorfcria javana. 



At the last moment we have received an example of this 

 remarkable creature. The male structures are so extraordinary 

 that they may be briefly described as having the appearance of 

 being crippled or deformed. The example is however so perfectly 

 developed as regards its external structure that there can be little 

 doubt as to the "deformity" being natural. 



The basal portion of the tambour is normal, but beyond this the 

 part is twisted so that the orifice for the protrusion of the median 

 lobe is placed laterally ; one of the two lateral lobes forms a very 

 hard, irregular tusk, while the other is membranous, and appears to 

 be merely a useless appendage. The median lobe appears also to be 

 twisted and deformed at the apex, which is slender. There appears 

 to be no line of demarcation, between median lobe and sac, and the 

 part just described may be considered to be the'everted sac. In that 

 case the lobe is prolonged forwards into the body far beyond the 

 tambour, and is of irregular shajie ; distally ample, then more 

 slender, and in front of this rendered a little more broad by means 

 of a large horse-shoe-sliaped sclerite; in front of this it is again 

 more slender, and contains some apparently semi-chitinised 

 structures extending to the part where it is joined to the duct. 



Obs. — The few Rutelina examined display forms that 

 may be group characteristics. Anisoplia, Phijllopertha and 

 Anomala have the lateral lobes free ; and they are elongate 

 in Anisoplia, short in Anomala. In the other forms 

 (except Bolaiv) they are united either at the base or for 

 their whole length. Anoplognathini have the cylinder 

 formed by their conjunction elongated. The extraordinary 

 Asiatic Fruhstorferia is quite abnormal by the distorted 

 aedeagus. Bolax has a very long tubular basal-piece, with 

 comparatively small, free lateral lobes, and should be 

 compared with Glaphyrinae, though it is probable that the 

 elongate, tubular form of the basal-piece may not be as 

 important as it is remarkable. 



Hcxodon unicolor (PI. XLVI figs. 25, 25ft). 



Median lobe large and membranous, with chitinous sclerites at 

 base, prolonged into median struts (las) consolidated for the 



