22 PEOCEEDINGS OF THE NATIONAL MUSEUM vol.69 



a right-angled triangle. Scape shorter, just reaching to the plane of 

 the frons; pedicel not much longer than thick, shorter than the 

 first funicle joint; flagellum cylindrical, moderately long, clothed 

 with numerous, uniformly scattered, semierect short setae; first 

 funicle joint slenderer than pedicel and about twice as long as thick, 

 the following joints decreasing a little in length, the sixth about 

 one-half longer than thick; club solid, slenderly oval, somewhat 

 pointed at apex, a little longer than the last two funicle joints com- 

 bined. Abdomen similar in shape, the cereal plates situated some- 

 what beyond the middle. 



TACHARDIOBIUS NIGRICANS, new species 



Plate 1, figs. 3 and 4 ; plate 2, figs. 24 and 24a 



Female. — Head slightly brownish black, with pale cream-colored 

 marks as follows: A small spot anteriorly on the ventroposterior 

 orbits of eyes, two pairs of small spots on dorsal orbits at the 

 anterior and posterior corners of the frontovertex, three spots in a 

 transverse line on the face at the middle of the scrobes, the outer 

 spots between scrobes and eyes, the middle one on the triangular 

 prominence between the scrobes; but sometimes the whole ventro- 

 posterior orbits are narrowly pale and three sometimes partly con- 

 fluent marks may occur on the oral margin, the middle one of these 

 in the form of an elongate triangle placed vertically between the 

 antennal sockets, the outer spots situated beneath the sockets. 

 Thorax black, the pleura sometimes more or less brownish; collar 

 of the pronotum sometimes with a small creamy white dot on the 

 posterior corners, the prepectal plates transparent whitish and ante- 

 rior margin of the mesopleura sometimes creamy white or pale buff; 

 posterior margin of collar except at the sides also sometimes nar- 

 rowly whitish; tegulae creamy white at the base. Abdomen black, 

 the protruding tip of ovipositor sheaths brownish yellow. Scape 

 and pedicel fuscous, the apical margin of the pedicel whitish; 

 flagellum brownish to rather dark fuscous. Legs varying from 

 brownish to fuscous on the darker parts; in the darker specimens 

 the coxae, trochanters, and femora are nearly black, with the middle 

 trochanters, apex of middle femora, and knee joint of front and 

 hind legs creamy white or yellowish; front tibiae fuscous with an 

 obscure paler spot on outer surface before the apex, the front tarsi 

 brownish at base and with the two apical joints fuscous; middle and 

 hind tibiae yellowish, with two fuscous rings just before and beyond 

 the middle and with a much narrower, more or less incomplete 

 brownish ring at apex ; spur of middle tibiae and first joint of middle 

 tarsi pale creamy yellow or whitish, the tarsi gradually growing 

 darker distad, the apical joint fuscous; hind tarsi brownish, the 



