82 THE ENTOMOLOGIST. 



posterior ocelli subobsolete. Scape as long as cheeks, second 

 flagellar joint half as long again as first, third as long as first and 

 second together. Pronotuui trans- striate, mesonotum diffusely 

 punctate, seutellum smooth, propleura) smooth, mesopleura; finely 

 striate and punctate ; median segment and metapleurye cribrate 

 punctate. Petiole trans-striate, apically smooth, as long as remainder 

 of abdomen, which is smooth. Terebra shorter than body, with 

 subapical white band. Hind coxa3 trans-striate, their femora smooth 

 and bidentate, tibiae compressed to slightly beyond middle. 



Black; mouth parts, inner and lower orbits, frons centrally and 

 two basal joints of antenna? flavous ; vertex and occiput nigro- 

 rufescent ; legs more or less rufescent. 



Length 9-13 mm. ; abdomen 5-8 mm. ; petiole 2i-4 mm. ; terebra 

 8i-12 mm. 



Hah. — Hoabinh, Tonkin, x\ugust, 1918 (R. V. de Salvaza). 



The dimensions are those of two specimens in the British 

 Museum, differing in size only. The colouring of this species 

 is exactly as m D. hilineatiis, Elliott, from which it differs in the 

 bidentate femora with unicolorous teeth. 



Diastejihanus simillimus, sp. nov. 



$ . Head extremely finely trans-striate, second flagellar joint 

 fully twice as long as first, third about as long as first and second 

 together. Neck of prothorax rather finely trans-striate, semiannular 

 smooth ; mesonotum punctate, mesopleurae smooth above, punctate 

 beneath ; median segment and metapleurae cribrate punctate. Petiole 

 very finely trans-striate, slightly longer than the remaining smooth 

 segments. Terebra much shorter than body, black. Hind coxaa 

 trans-striate, femora smooth, bidentate, tibiae, compressed to middle. 

 Wings hyaline. 



Black ; the front of the head is coloured exactly as in trilineatus, 

 Elliott ; anterior tarsi pale. 



Length 12| mm. ; abdomen 7^ mm. ; petiole 4 mm. ; terebra. 

 9 mm. 



Hah. — Hoabinh, Tonkin, August, 1918 (R. V. de Salvaza). 



This species beard a strong resemblance to trilineatus, but 

 is easily distinguished by the longer second flagellar joint and 

 by the entirely black terebral sheaths. 



DiastepJianus trilohatus, sp.- nov. 



$ . Frons and vertex extremely finely, occiput more coarsely 

 trans-striate, posterior margin of head very finely bordered. Scape 

 slightly longer than cheeks, first and second joints of flagellura of 

 equal length, third about as long as first and second together. 

 Pronotum transrugose, apically coarsely, basally more finely, the 

 extreme base smooth ; mesonotum and seutellum smooth with a 

 few coarse punctures, mesopleuri;e smooth above, punctate beneath ; 

 median segment coarsely and irregularly, metapleurae cribrate punc- 

 tate. Petiole shorter than rest of abdomen, finely trans-striate 

 remaining segments smooth. Terebra very slightly longer than 



