HYMENOPTEROUS FAMILY STEPHANID^. 825 



vertex closely trans-striate, as also the occiput, which has an 

 . indistinct longitudinal impression. Anterior three frontal 

 tubercles stoat, conical; the posterior smaller and more rounded. 

 Second flagellar joint not quite twice as long as first. Pronotum 

 closely aciculate, basally smooth, with an apical transcarina. 

 Mesonotum centrally trans-striate ; scutellum smooth. Meso- 

 pleurae basally and apically sparsely punctate ; metapleurse 

 reticulate, lower half smooth, with four suboblique carinse. 

 Median segment strongly reticulate. . Petiole closely trans- 

 striate, nearly twice as long as rest of abdomen, which is 

 short ovate. Hind legs with coxae finely trans-striate ; femora 

 rather dull, basally transrugose, tridentate ; tibiae compressed 

 to middle. 



Black ; head dark red, vei'tex nigrescent, outer orbits yellow ; 

 pronotum basally, second and third abdominal segments laterally 

 testaceous ; anterior coxae, trochanters, tibiae and tarsi rufo- 

 testaceous ; hind tiirsi red. Wings hyaline ; stigma and 

 nervures pale fuscous. 



Length 12-14 mm. ; abdomen 5g-7 mm. ; petiole 3g-4^ mm. 



Habitat : Kuching, Sarawak. Type in British Museum. 



36. FLAVIFRONS Elliott. 



Diastephanus Jlavifrons Elliott (1), p. 131, S • 



cJ . Frons irregularly rugose, vertex transcarinate, occiput 

 trans-striate ; posterior margin of head boidered. Second flagellar 

 joint neai-ly twice as long as first ; third not quite as long as 

 first and second together. Pronotum trans-striate, deeply 

 impressed at apex; mesonotum centrally smooth, laterally rugose, 

 lateral impressions distinct. Mesopleurae finely striate ; nieta- 

 pleur^e punctate ; median segment coarsely punctate. Petiole 

 trans-striate, as long as rest of abdomen, which is smooth 

 and shining. Hind coxae trans-striate; hind femora smooth, 

 bidentate. 



Black; face and lower half of frons white, the edges of the 

 colour sharply defined, that of the black forming an inverted W, 

 and the mandibles apically broadly black, sharply defined ; frontal 

 tubercles rufescent ; two basal antennal joints pale red ; apex of 

 pronotum obscurely, second and third abdominal segments, 

 anterior tibiae and tarsi rufescent. Wings hyaline, with red and 

 green iridescence. 



Length 11 mm. ; abdomen 8 mm. ; petiole 4 mm. 



Habitat: Quop, West Sarawak. G. E. Bryant ; iv. 1914. Type 

 in British Museum. 



This species is distinguished by the colour of the head ; the 

 black colour of the mandibles, which is unusually broad, has a 

 straight margin against the white of the face, while the lower 

 border of the dark upper part of frons forms a clear-cut broad 

 inverted W. 



