Anatomy of the Male Genital TvM in Coleo2}tcra. 597 



median lobe have, attached to each one, a slender tendon, 10 mm. 

 long, and elastic, like india-rubber. 



Eupatorus hardivichi. 



Is very like A. centaurus, but the points of the lateral lobes are 

 longer and slightly spatulate at tips, the opening between the lateral 

 lobes is much narrower. The chitinous developments are compara- 

 tively small, the ventral plate being feebly chitinised. We see 

 no remarkable structures on the sac or median lobe, but the only 

 individual at our disposal is in very bad preservation. 



Golofa eacus. 



Basal portion of tambour large and convex, the distal portion not 

 quite so long as the basal, not cylindric but a good deal flattened. 

 The lateral lobes very remarkable ; strongly deflexed, each at the 

 base on the dorsal side developed into a plate, meeting the other 

 and so forming a roof over the base of the orifice ; furnished at the 

 apex each with two patches of hair one of which projects beyond the 

 tip, while the other forms a large, very dense patch on the inner 

 and ventral aspect. The ventral plate peculiar, very strongly chitin- 

 ised, and prolonged as far backwards as the patch of hairs described 

 above, and visible between the apical parts of the lateral lobes as a 

 free edge. Sac elongate and of contorted form, but no armature has 

 been detected. 



The specimen was in very bad preservation. The pro- 

 longed fold of the ventral plate is remarkable; it limits 

 and shapes the orifice through which the median lobe is 

 protruded. 



Homoiiliileurus 4t-tuhercidatv.s. 



Median lobe large, membranous, the chitinous support at base 

 produced into median struts. Lateral lobes very long, turned 

 downwards nearly at right angles to the basal-piece, the tips slightly 

 curved and spatulate, tlie inner margins parallel, contiguous distally, 

 slightly separated basally. Basal-piece large, tambour-shape, con- 

 stricted near the middle, the basal part being greatly widened 

 with a ventral plate moderately chitinised distally, to which the 

 lateral lobes are fastened, but not consolidated. Internal sac large 

 with several long diverticula at apex, covered with hair, but with no 

 other armature. 



Phileurus didi/mus. 



This is strikingly difi'erent from H. 4-tuhprciihitns. The basal- 

 piece is elongate, but it is subcylindric, and the lateral lobes are 



