232 



JAMES WxVTERSTON. 



Tetrastich US atrlclavus, sp. nov. (figs. 1, 2). 



Q. Head, thorax and abdomen black, with dark shining, at most submetallic green 

 or bluish greeji lustre on the notum of the thorax. Wings slightly tinged, nearly clear. 

 Legs mainly yellowish, the femora a little browned and the coxae externally somewhat 

 darker. The club of the antenna shows decidedly black against the yellow of the other 

 joints ; the scape is very pale while the pedicel and funicle have a slight tinge of 

 brown. 



V'lg. 1. Tetrastichus atriclavus, sp. n. ; a, antenna of o (outside) ; b, antenna 



of $ (inside). 

 T. viaiiripennis, sp. n. ; c, antennae of ^ (inside) ; d, antenna of $ (outside). 



Head.—^yes bare, separated by nearly twice the diameter of either, seen from in 

 front ; scrobes set on the base line of the eyes, with about ten bristles (5, 5) between ; 

 Irons between scrobes and anterior ocellus with many (about forty on each side) 

 bristles in three rows, the post-scapal bare area thus narrow ; about three bristles 

 inside the genal ridge and two transverse rows (6, 4) below the scrobes, while three 

 minute bristles stand on each median clypeal lobe ; genae and occiput with many 

 bristles. Antennae (fig. la) comprising scape, pedicel, ring joint, funicle of four 

 joints, three in club. Length just under 'S mm. Scape deep (20 : 7), internally 



