_Indo- Chinese Hymenoptera. 431 
extending well beyond the middle of the mesonotum ; 
median segment finely and rather closely punctured at the 
base, smooth at the apex, with a longitudinal median groove. 
‘Abdomen elongate, about half as long again as the head, 
thorax, and median segment combined, the four basal 
tergites Jongitudinally coarsely rugose-striolate ; the first 
tergite coarsely obliquely striate on the basal half, nearly 
half as long again as its apical breadth, rather strongly 
convex in the middle, the lateral grooves indistinctly trans- 
versely striated. Second tergite with a feebly convex and 
strongly longitudinally striated, but ill-defined, triangular 
basal space "reaching to the middle ; the spaces at the 
anterior angles small, divided from the rest of the tergite 
by a smooth oblique groove, the tergite nearly as long as 
its apical breadth. Suture between the second and third 
tergites, also the two following sutures finely crenulate. 
Third and fourth tergites much broader than long ; with 
large smooth areas at the basal angles uearly reaching the 
apical angles and bounded by a finely crenulated groove. 
lifth tergite rugose in the middle, the remaining tergites 
minutely punctured. Valvulee clothed with short hairs 
which are black on the basal half, fulvous towards the apex ; 
terebra with four ill-defined joints on its apical third. 
Nervulus strongly postfurcal; radial cell not quite reaching 
to the apex of the wing, second abscissa of the radius as long 
as the third, recurrent nervure interstitial. 
Hab. Vieng Vai, Haut Mékong; June 10,1918. 19. - 
This genus was described by Szépligeti from an Ethiopian 
species, HL, nigripennis, Szép. 
The present species agrees well in structural details with 
that insect, though the recurrent nervure is not interstitial 
in nigripennis. Both species show the curious jointed 
terebra. Superficially and in colour the present. species 
resembles Jphiaulax halyaetus, Cam. 
Subfamily Acarar sz. 
Cremnops mekongensis, sp. 0. 
2. Testacea; antennis, tibiis posticis apice, tarsis posticis, terebra 
valvulisque nigris ; alis flavo-hyalinis, venis flavis, vena basali 
macula ferruginea. 
Long. 8 mm. ; terebie long. 3 mm. 
o. Bastin very long ; head smooth and shining, the 
front deeply excavated above the base of the antenne, the 
excavation divided by a longitudinal carina; a few small 
punctures on the vertex. Mesonotum finely punctured, a 
