HYMENOPTEEOUS FAMILY STEPHANID^. 817 



upper margin of the colour is trilobed, the central lobe extending 

 to the lower tubercle, the outer lobes triangular ; antenna3 basally 

 rufo-testaceous ; posterior metatarsi white. Wings hyaline. 



Length 11 mm.; abdomen 7 mm.; petiole 3 mm. ; terebra 

 11| mm. 



Habitat: Hoabinh, Tonkin. R. V. de Salvaza. Aug. 1918. 

 Type in British Museum. 



Differs from D. trilineattis Elliott in the shorter second 

 flagellar joint, sculpture of mesonotum and mesopleurse, and black 

 terebral sheaths. In D. h-ilineatus and simillimus two descending 

 rufescent streaks divide the space between the eyes into five about 

 equally bioad strips of colour, and the lower tubercle is entirely 

 black. In D. trilohatus tlie nari'ow centi'al streak extends to 

 the top of the tubercle and the outer streaks are broadly 

 triangular. 



23. DOHKNi Enderl. 



Diastephanus dohrni Enderl. (4), p. 291, $ . 



5 . Head medium size ; frons anteriorly regularly, posteriorly 

 irregularly transrugose, an irregular longitudinal impression below 

 anterior tubercle, space between tubercles arcuate rugose ; vertex 

 transrugose ; occiput rather wavily trans-striate with central 

 longitudinal impression and finely bordered. Second flagellar 

 joint one and a half times as long as first : third as long as first 

 and second together. Pronotum dull, indistinctly transrugose in 

 front, posterior margin polished smooth. Mesonotum smooth, 

 with diffuse coarse punctures and apically transrugose ; scutellum 

 smooth, six deep punctures on each side. Mesopleurre smooth, 

 anterior third densely and finely punctate, with diffuse larger 

 punctures, posterior half coarsely punctate on each side of a 

 central carina. Metapleuree and median segment coalescent, 

 irregu:larly and laterally reticulately punctate. Petiole finely 

 trans-striate, apically transrugose, shorter than rest of abdomen, 

 which is smooth, basally slightly rugose. Terebra as long as body, 

 spicula red-yellow, sheaths entirely black. Hind legs with cox^e 

 slender, finely and densely trans-striate ; femora smooth, with 

 microscopic sculpture. 



Black ; head except vertex and apices of mandibles, 4-5 basal 

 antennal joints ferruginous ; anterior legs pale ferruginous, hind 

 tibiae and tarsi dark brown. Wings hyaline; nervures brown, 

 stigma hyaline, apically very pointed. 



Length 18 mm.; abdomen 11| mm.; petiole 5^ mm.; terebra 

 18 mm. ; fore wing 9| mm. 



Habitat: Soekaranda, Sumatra. 1 $. Dr. Dohrn ; Jan. 1894. 



This species is not unlike D. carinifrons Enderl. in colour and 

 in habitus, but differs chiefly in the structure and sculpture of 

 head, shorter petiole and terebra, the latter having entirely black 

 sheaths. 



