504 On Three new Species o/Olbiogaster, O.-S. 



yellow ; femora yellow ; tibia? dark brown, with some 

 slender short black bristles on the under sides, spurs yellow ; 

 tarsi blackish. Wings practically hyaline, the stigma dark 

 bi'own ; venation as in 0. sackeni. H alter es with yellowish 

 stem and dark knob. 



$ . Resembles the male, except that the mesothoracic 

 scutum is brown in the middle ; the yellow apical margins 

 to the abdominal segments are obsolete, although the white 

 pubescence is conspicuous ; the abdomen is narrowed towards 

 the tip instead of having segments 6 and 7 expanded. 



Length (without antennae) 7—8 mm. 



ASHANTI : 2 ^ (including type), 2 ? from Obuasi, 7. vi., 

 24. vi., 5. vii., and 1.x. 1907, caught on leaf and on window 

 {Dr. W. M. Graham). IS. NIGERIA: 1 £ , Oshogbo, 

 23. viii. 1910, in house {Dr. T. F. G. Mayer). 



3. Olbiogaster orientalis, sp. n. 



? . Head mainly yellow ; a large shining blackish-brown 

 triangular spot on the vertex, with its apex extending down 

 the front almost to the base of the antennae, and at the level 

 of the ocelli connected with the eyes by a small projection 

 on each side. Clypeus mainly occupied by a round black 

 spot, the margin remaining yellow. Antennae with the two 

 basal joints yellow, the next three black (remainder missing) ; 

 first flagellar joint a little <^ver twice, second and third three 

 times as long as broad, with a very short black pubescence. 

 Palpi and labella yellow. Thorax: Prothoracic lobes shining- 

 black, except on upper edge, which is yellow. Scutum 

 mainly shining black ; margin and a pair of humeral spots 

 yellow ; no long pubescence (possibly denuded) ; lighter 

 brown areas in the middle and on the anterior part of the 

 post-alar calli. Scutellum yellow. Postnotum black, with 

 some long pale hairs. Pleurae shining black, upper margin 

 yellow, a whitish spot above the middle coxae. Abdomen : 

 segments 1-5 blackish, with large yellow, basal, lateral spots 

 which, except on the first segment, are triangular ; sixth 

 segment black, except that the posterior margin is narrowly 

 white ; seventh segment and ovipositor yellow. Pubescence 

 long and pale on the first segment, short on the remainder 

 and of the same colour as the underlying integument. Legs : 

 Front and middle coxae yellow ; hind coxae (which are dis- 

 tinctly the shortest) blackish. All the femora and the front 

 tibiae yellow ; the hind femora darkened at the tip ; middle 

 and hind tibiae dark brown, lighter towards the base; tarsi 



