REVISION OP ELEODIINI BLAISDELL. 21 



(Plate 7, fig. 1) and E. dentipes (Plate 9, fig. G) ; convex ventrally in 

 Emhwphion (Plate 7, fig. ly) and Eleodes planipennh (Plate 9, 

 fig. 7) ; in Eleodes scahricula the inferior surface of the apicale is 

 concave apicad to the alae, which are suddenly prominent. In the 

 different species the ala? are continued basad to a varying degree, be- 

 coming more and more membranous. (See figs. 6, 7, and 9, Plate 9.) 



The Edeagus (Plate 9, fig. 11a) is usually flattened, sublingui- 

 form in shape and subacute at apex; the ventral surface is narrowly 

 prominent iu the median line and more or less concave laterally where 

 it is in contact with the clava^ in repose; the median ridge, divides 

 toward apex to become bilabiate, between which is probably the ori- 

 fice of the vas deferents. At base the structure is more chitinous and 

 there is a small median process for articulating with the clavse. 

 The dorsal sui'face is feebly convex and more or less membranous 

 and marked by a median groove; opposite the attachment of the 

 clava' ventrally the surface membrane is reflected upon the internal 

 wall of the apicale, forming the fornix edeagi. In fig. 12 of Plate 

 9 the orifice of the detached vas deferens can be seen entering the 

 edeagus from the basale just beneath the fornix. 



At the base the sides of the edeagus are strongly chitinized and 

 produced into two long j^rocesses (Plate 9, figs. 11a and 12) Avhicli 

 extend cephalad within the interior of the basale, giving attachment 

 to nmscles. 



The <iar((' are usually (juite spiculiform (Plate 2, figs. 1 and 8), 

 sometimes sublaminately spiculiform (see figs. G, lid and 12, Plate 9) 

 and in Emhaphlon truncate at tip and concave beneath; in Eleodinior- 

 plui they are rather liguliform (see figs. 7 and 8, Plate 7). 



In repose when the edeagus is retracted they lie parallel to the 

 median line and more or less contiguous; with the edeagus pro- 

 truded they are at right angles to the axis of the edeagophore. 



Each clava may be said to have a base and an apex, a dorsal and a 

 ventral surface, and internal or posterior surface and an external or 

 anterior margin. 



The base is obliquely truncate at the posterior or internal surface 

 and articulated to the ventral surface of the edeagus at base; the 

 internal or posterior surface or edge is nnich thicker than the anterior 

 or external, and triangular in basal half, and thence gradually be- 

 coming more ventral as it attains the apex, where it is feebly con- 

 vex, the basal portion is quite plane; apex subacute to rounded or 

 rather obliquely truncate; the external or anterior edge is usually 

 thin, feebly arcuate and slightly notched near the apex; the dorsal 

 surface more or less convex and the ventral rather concave. (A\ 

 dentipes^ Plate 9, figs, lid and 12.) 



In repose the clavffi may conceal the edeagus, except at apex, 

 where they slightly diverge, when they are ventral as in Eleodes; or 



