labrum in the one and the other species, analogous to the differ- 

 ence that distinguishes the third section of lleterony.r (in my 

 revision of the genus Proo. Linn. Soc, ^".S.W., 1889 and 1890) 

 from the first section. In the first species described below 

 (0. spinicoUis) the suture between the clypeus and labrum is 

 very strongly arched i'l an angular fashion, so that the summit 

 01 the labrum rises towards the level of the upper surface of tlie 

 clypeus (though without very nearly reaching it), while in the 

 other (0. fallax) the suture is much nearer being straight, so 

 that the summit of the labrum is placed very much further below 

 the level of the upper surface of the clypeus. In 0. lufjubris, 

 Blackb., the structure of these parts is as in 0. faUa:i\ 



The punctures of these insects are not, I think, truly squanr 

 igerous, though to a superticial glance they may appear so, but the 

 bottom of each puncture, under a strong lens, appears to be un- 

 evenly convex, or to consist of a convexity or granule intersected 

 by one or two tine stria.'. 



N.B. — Since writing the abo\'e I have determined to refer to 

 Ocaodiiti a third species, for which I had intended proposing a 

 new generic name. On full consideration, however, although I 

 f^till think it probable that it may eventually be found de.sirable 

 to separate it generically, I cannot overlook the possibility that 

 lurther research may produce intermediate forms such as to prove 

 the structural differences merely specific. This third species 

 differs from the other two principally by the different relation to 

 each other of the labrum and clypeus ('in 0. spinicoIUn tim] falhi:>; 

 and also in 0. luguhris, the perpendicular front face of the 

 clypeus is much elongated, so that the distance from the front of 

 upper surface of the cl3'peus to the mouth organs is very con- 

 siderable, but in 0. ferruginPAis the front face of the clypeus is 

 inuch shorter, tlie line of separation between the clypeus and 

 labrum being almost as in 0. fallax), the vestiture of the under 

 surface of the tarsi (consisting in 0. npinicollis and fallax of a 

 thick mass of setie at the apex of each joint as specified liy 

 Jjurmeister in his generic diagnosis, while in 0. ferrugineus this 

 structure is mucli le.ss strongly defined), and in the upper sui'face 



, ^"^ body of 0. ferrug'meus being somewhat closely sprinkled 



With short whitish recurved setse, which are wanting in all its 



congeners except 0. decipiens, Burm., the real type of the genus. 



may add that 0. spinicoUis and fallax differ from all the other 



■^pecies yet described by the absence of set* in combination with 



sharp-produced hind angles of the prothorax, 0. luguhris by the 



oriner character without the latter, and that O.femiginens may 



6 at once distinguished from 0. c?ecj;»'e9)s, Burm., by its much 



sinaller size and non costate elytra. 



■ y^micollis, sp. nov. Femina. Bobustus ; modice elongatus ; 



