Indo- Chinese Hymenoptera. Te 
flavo-testaceis ; alis hyalinis, anticis in medio hic illic fusco 
leviter suffusis, venis flavo-testaceis ; stigmate magno, dimidio 
basali piceo, dimidio apicali pallide flavo. 
Long. 12 mm.; antennarum long. 16 mm. 
9. Eyes large and prominent, widely emarginate in the 
middle of the inner orbits; ocelli large, narrowly separated 
from: each other ; vertex short, narrowed rapidly behind the 
eyes, the occipital carina feebly arched. Vertex smooth and 
shining, face closely and rather finely punctured, raised 
along the median line, cheeks very short ; antenne very long 
and slender, about 83-jointed; maxillary palpi very long and 
slender. Notauli deep, minutely crenulate, the mesonotum 
finely and closely punctured, mesopleure rather sparsely 
punctured. Median segment with a distinct median carina 
and several lower transverse caring on each side, an irregular 
undulating carina on the lateral margin of the dorsal surface ; 
the sides of the segment finely rugulose, with short strong 
striee above. Abdomen finely longitudinally rugulose on the 
dorsal surface, subpetiolate, the two basal tergites with a 
strong median longitudinal carina ; first tergite broadened. 
from the base, three times as long as its apical breadth, the 
spiracles situated at about two-fifths from the base, the apical 
angles produced into a very distinct tubercle on each side ; 
second tergite about twice as long as its apical breadth, about 
three-quarters of the length of the first segment, second suture 
strongly crenulate ; third tergite as broad at the apex as long, 
very little more than half as long as the second; fourth and 
fifth tergites the broadest ; terebra very short. Hind calearia 
short and curved, shorter than the fourth joint of the hind 
tarsi. Radius in hind wing strongly upeurved in the middle ; 
first transverse cubital nervure meeting the cubitus at right 
angles; second abscissa of the radius long, strongly swollen 
at the base, and distinctly curved on the basal third. 
Hab. Muong You, Luang Prabang, November 13; 1 9. 
Very nearly related to Md. mindanaensis, Baker, but seems 
to be paler in colour, the first tergite seems to be somewhat 
more slender, there is no median carina on the third tergite in 
the present species, and the hind calcaria seem to be some- 
what shorter. Troporhogas, Cam. (1905), must, I think, sink 
as a synonym of this genus. 
Subfamily Macrocenrrina. 
Macrocentrus tricoloratus, sp. n. 
9. Nigra; mandibulis, apice excepto, palpis, clypeo, orbitis, pro- 
