1899.] NATURAL SCIENCES OF PHILADELPHIA. 241 



]S"o. 12 above), while one male of affinis has it shghtly nearer the 

 base of the wing than the second anteuodal is. Further, although 

 Mr. Kirby states in his original characterization of Hemistigma 

 (Trans. Zool. Soc. Lond., xii, p. 295, 1889) that the abdomen is 

 "as long as the hind wings in the male," all three males of H. affinis 

 just quoted have the abdomen shorter than the hind wing. 



The genus Bradinopyga Kirby (Journ. Linn. Soc. Lond. Zool., 

 xxiv, p. 553, 1894), from Ceylon, is compared by its author to 

 Hemistigma. Hemistigmoides differs from Bradinopyga in the 

 characters above numbered 5, 16, 17 (for the hind wings), 19, 

 20, 27 and 30.' 



In Dr. Karsch's arrangement of the genera of the Libellulinae 

 {Berl. Ent. Zeit, xxxiii, p. 356, 1890), Hemistigmoides would 

 fall in the same section as Perithemis. It differs from Perithemis, 

 however, by the characters above numbered 16, 20, 21, 24-, 25 

 and 27. 



13. Hemistigmoides deceptor n. sp. (PI. X, fig. 4.) 



One male, Sheikh Husein, September 29, 1894. 



cf. — Vertex brown, its tip with a small metalHc dark green 

 spot. Upper surface of frons dark metallic blue-green, sides and 

 anterior surface and the clypeus pale green, Labrum yellow, nar- 

 rowly edged with black at the middle of the front margin. Labium 

 yellow, a median line on the middle lobe and the inner edges of 

 the lateral lobes da»k brown. Occiput brown. 



Prothorax dull blackish, middle lobe Avilh a median twin spot 

 and a small lateral spot — pale. Thoracic dorsum obscurely mottled 

 with green and brown. Sides pale green with blackish brown 

 stripes on the first (obsolete) and second lateral sutures, confluent 

 below with the mostly dark pectus; this last has a pair of spots and 

 behind them a transverse streak — all green— on the metasternum. 



^ The structure of the prothorax of Bradinopyga is not mentioned by Mr. 

 Kirby ; his description states that the sectors of the triansjle of the hind 

 wings are separated at base, while his figure (?. c, PI. 41, f. 3) of i>. sf((/mata 

 Kirby shows them arising from the same point. Mr. Kirby has kindly 

 informed me on both of these structures, by letter dated March 30, 1899, 

 as follows: "In Bradinopiiga the sectors of the triangle are distinctly 

 separated, but not for more than a comparatively short space, which varies. 

 In the type, the prothorax is not properly visible ; but in a second specimen 

 it seems to be shaped something like this : [here a sketch] i. e., quadrilo- 

 bate, the two central lo))es sloping down on the sides, and the hind one 7iot 

 divided and considerably smaller." 

 16 



