Seychelles and Rangooi^. 29 



segment, while in tlie Orthoperi there is only tlie pair on the 

 metastenium. The species in which I have seen them are : — 

 cequalis, Sliarp, atimvirius, Heer, hrunnipes, Gyll., coriaceus, 

 Key, crofchi, jMattli., kluki, Wank., muniie, sp. n., ovatus, 

 Mattli. I have not < xainined the other species of tlie genus 

 as to whether these striae are present or not. 



Siicondaf// Si'Xiial Characters. — More than one writer has 

 noted thai the front tibiffi of some Orthoperus are long and 

 incurved at the apex. Tiius Matthews, in liis description of 

 the genus (Mon. p. 182), *' [anterior] tibiee often very long 

 and much incurved, abruptly incurved at the apex''; and 

 again, in his descriptions of some of the species^ "anterior 

 tibias very long and strongly incurved/' or, contrariwise, 

 " anterior tibise nearly straight" (see also his figure, pi. vii. 

 fig. A 1). But it does not seem to have been stated that this 

 difference in the form of the tibiae is, in some species at least, 

 sexual. Thus, in 0. mnnice, sp. n., the front tibire of some 

 specimens, which I infer to be ^ , are more incurved towards 

 the a|)ex, and have a sharp heel or spur at the inner apical 

 angle (fig. 42) ; while those of other examples, presumably 

 ? , which in all other external characters appear identical 

 with the preceding, are straighter and have no such heel 

 (fig. 43). In this case the curvature of the ^ tibia is not 

 very marked, but it is much greater in 0. minutissimus, 

 Matth. (fig. 44). Dr. Sharp has pointed out to me the same 

 kind of sexual difference in the form of the front tibiae in 

 some of our British Ortlioj^erns. The divergence of the sexes 

 in this respect is sometimes quite sufficient to be seen with a 

 hand-lens. 



Casey (1908, p. G/>) describes for certain North-American 

 forms a new genus Eutrilia, one of the principal characters 

 of which is that ir has the front tibi^ more flattened and less 

 incurved at tlie apex than in Orthoperus. It will be necessary 

 to discriminate between sexual and other differences before 

 the limits of the two genera are made quite clear. 



13. Orthoperus iriutn'ce, sp. n. 

 (PI. IV. Hgs. 40, 41 ; PI. V. figs. 42, 43.) 



Ovatus, valde coiivexus, nitidissimus, glaber, piceo-fuscus, pedibua 

 autenni^que testaceis, harum clavis infuscatis ; thorace serie 

 basali punctorum fortium ad latera hand attingente, in medio a 

 basi magis distante, munito, disco subtilissime ac subobsolete 

 puuctato ; elytris sat dense sed subtilissime ac subobsolete punc- 

 tatis ; (S tibiis anterioribus ad apiceni parum incurvatis, angulo 

 apicali interiore producto. 



Long. corp. 0-7 mm. 



