104 IIYMKNOPTEKA FROM SARAWAK. 



thorax is sharply keeled; the third cubital cellule is of the same 

 width above as below ; the third transverse cubital nervure is 

 parallel with the second, and both are roundly curved inwardly. 



Ischnogaster flaviplagiatas, sp. nov. 



Ferruginous brown, the clypeus, eye orbits, two marks, 

 obliquely narrowed, on the base of the scutellum, the pleurae and 

 the apical half of the median segment, pallid yellow ; the wings 

 clear hyaline, the stigma testaceous, the third cubital cellule not 

 half the length of the second, the fourth at the top as long as 

 the third. 9 



Long : 13-14 mm. 



Hab. Kuching, Sarawak. 



Antennae ferruginous, the flagellum darker in the middle 

 above. Head smooth ; the front and vertex covered with sil- 

 very pubescence ; the clypeus with longer fuscous hair. The 

 lower part of the clypeus is ferruginous, the upper yellow. 

 Mandibles yellow, their apex black. The inner orbits and the 

 eye incisions yellow. Thorax smooth and shining, thickly 

 covered with glistening white hair. The base of the median 

 segment is darker coloured than the mesonotum ; it is smooth 

 and is distinctly keeled down the centre. Wings clear hyaline, 

 highly iridescent; the stigma clear testaceous; the nervures 

 darker ; the second cubital cellule is more than twice the length 

 of the third, which, at the top, is as long as the fourth ; the 

 second and third transverse cubital nervures are straight and 

 converge above ; the first recurrent nervure is received quite 

 close to the first transverse cubital ; the second at fully twice 

 the distance from the second ; the second recurrent nervure is 

 slightly and roundly bent outwardly in the middle. Legs paler 

 in tint than the body, and thickly covered with pale hair. Abdo- 

 men coloured like the thorax, the segments mottled with pallid 

 yellow; there is a distinct pale yellow mark on the base of the 

 second segment at the sides and a large one on the side of its 

 ventral surface ; the extreme base of the narrowed neck is also 

 yellow. On the mesopleura? under the teguhe is a mark which 

 reaches to the middle ; below the middle is a large curved 

 ypllow mark. 



Comes near to /. mtiilipenrris Sauss. Sec. Bingham. 



