334 JOURNAL, BOMBAY NATURAL HISTORY SOCIETY, Vol. XIV. 



and a large round basal spot on wings, yellow ; feet and forceps testaceous ; 

 abdomen castaneous. Forceps of the $ with the branches stout, remote at 

 the base, gently arched outwards for the first third of their length, dilated 

 on the inside, rounded ; then more slender, depressed, curved in an oral for 

 the second third of their length, with a sharp tooth on the inner margin, 

 the tooth being triangular and horizontal ; beyond this the points are sharp 

 and decussate. The basal third is horizontal, the remainder slightly pointing 

 upwards. 



$ 

 Length of body 9-10 mm. 



„ of forceps 3 mm. 



Opisthocosmia humeralis, Kirb., 1890, Linn, Soc. Journ. Zool., XXIII, 



523 (9). 



Borm., 1894, Ann. Mus. Civ. Gen. (2), XIV, 4:00,($). id., 1900, Forf. 95. 



Hahitat.— Ceylon. (Kirb., Mus. Hope) ; Palon in Pegu, Burmab (Borm.) 

 Easily recognisable by its form and colour. 



OPISTEOCOSMIA SIMPLEX, Borm. 



Darkish-chesniit, glabrous, shining. Head reddish or testaceous ; antennae 

 12-segmentate, brown, the 8, 9 or 10 sometimes paler. Pronotum brown, 

 as broad as the head, nearly semi-circular, anterior border straight, posterior 

 border rounded, convex in the middle, the sides flat and transparent. 

 Elytra reddish-brown, smooth, considerably broader than the pronotum at 

 the shoulders, which are well rounded, narrowed towards the apex, and 

 truncated there. Wings projecting well beyond the elytra, of the same 

 colour, with a pale-testaceous spot at the base on the outer border (sometimes 

 absent by variety), and at the apex, on the inner margin, at the suture, a 

 very small yellow spot. Feet blender, clear brownish-yellow. Abdomen 

 brown, smooth, oval, elongated, and dilated in the middle, last dorsal segment 

 trapezoidal, twice as broad at the base as at the apex, smooth, slanting down- 

 wards, the sides always smooth in the 9, sometimes finely denticulated in 

 the $. Pygidiiim not visible. Branches of the forceps in the ^ clear 

 brown, rounded, nearly contiguous at the base, then curved upwards, com- 

 pressed and touching in the basal third, then horizontal and faintly diverging 

 towards the points, which are incurved and cross ; outside they are faintly 

 bisinuate, very finely denticulate on the inner margin, with a horizontal 

 internal tooth near the apex (almost rbsolete in some specimens) ; in the ^ 

 the branches are shorter, unarmed, nearly straight, and subcontiguous 

 attenuated at the apex, whore they cross. 



Length cf body 11-115 mm., $ 9. 



of forceps $ b'h mm., 9 4'5, 

 Opisthocosmia simplex, Borm., 1894, Ann. Mus. Civ. Gen. (2), xiv, 396. id. 

 1900, Forf. 98. 



Haiitat.—Buvmah. (Borm.) ; Ceylon, one mutilated female (Thwaites, in 

 poll, Hope), 



