Anatomy of the Male Genital Tube in Coleoptera, 597 
median lobe have, attached to each one, a slender tendon, 10 mm. 
long, and elastic, like india-rubber. 
Eupatorus hardwickt. 
Ts very like A. centawrus, but the points of the lateral lobes are 
longer and slightly spatulate at tips, the opening between the lateral 
lobes is much narrower. Thechitinous 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. 
Homophileurus 4-tuberculatus. 
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, the 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 didymus. 
This is strikingly different from H. 4-tuberculatus. The basal- 
piece is elongate, but it is subcylindric, and the lateral lobes are 
