Seychelles and Rangoon. 29 



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

 metastfinuin. The species in which I have seen tliem are : — 

 ceqitalis, Siiarp, ati.mnriiis, Heer, hrunrnpes, Gyll., coriacens, 

 Key, crofchi, ]\Iattli., kluki, Wank., munue, sp. n., ovatus, 

 Matth. I liave not examined the other species of tiie genus 

 as to whether these strije are present or not. 



Sucondary S/^.vual Characters. — More than one writer has 

 noted thai the front tibiae of some Orthopenis are long and 

 incurved at the apex. Thus Matthews, in his description of 

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

 and much incurved, abruptly incurved at the apex^'j and 

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

 tibiae very long and strongly incurved,*' or, contrariwise, 

 " anterior tibipe nearly straiglit " (see also his figure, pi, vii. 

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

 difterence in the form of the tibiaj is, in some species at least, 

 sexual. Tlius, in 0. ninnice, sp, n., the front tibiw of some 

 specimens, which 1 infer to be (J , are more incurved towards 

 the apex, and have a sharp heel or spur at the inner apical 

 angle (fig. 42) ; while those of other exam])les, presumably 

 ? , which in ail other external characters appear identical 

 with the preceding, are straighter and have no such heel 

 (fig. 43). hi this case tlie curvature of the (^ tibia is nut 

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

 Matth. (Hg. 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 O'thoperus. The divergence of the sexes 

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

 hand-lens. 



Casey (1908, p. &o^ describes for certain Nortii-American 

 forms a new genus Eutrilia, one of the principal characters 

 of which is that it has the front tibise more flattened and less 

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

 to discriminate between sexual and other differences before 

 the liniiis of the two genera are made quite clear. 



lo. Orthoperus muuice, sp. n. 

 (IM. IV. rig^. 40, 41 ; PI, V. tigs. 42, 43.) 



Ovatus, valde coavexus, nitidissimus, glaber, piceo-fuscus, pedibus 

 autennisque testaceis, harum clavis infuscatis ; thorace serie 

 basali punctoruni fortium ad latera hand attiiigento, in medio a 

 basi magis distante, munito, disco subtilissime ac subobsolete 

 punctato ; elytris sat dense sed subtilissime ac subobsolete punc- 

 tatis ; (S tibiis anterioribus ad apicem parara incurvatis, angulo 

 apicali interiore producto. 



Long. corp. 0-7 mm. 



