oe. The Philippine Journal of Science 1922 
end, as long as the three or four following joints together, 
second joint somewhat elongate, third to twelfth transverse, 
thirteenth elongate, all bare, second and third joints testaceous. 
Pronotum elongate, opaque, closely punctured, somewhat 
wider behind than in front. Mesonotum scarcely more than 
half as long as pronotum, smooth, shining, transversely elliptic. 
Scutellum opaque, very finely punctured, anteriorly with two 
short oval depressions almost touching each other. Median 
segment quadrangular, distinctly longer than broad, bordered 
laterally and posteriorly by a furrow, finely coriaceous, with 
five parallel, contiguous, longitudinal carine in the middle, 
these somewhat shortened posteriorly, only the medial one 
continuous. ® 
Wings scarcely fuliginous; basal and transversal equally long 
and equally sloping, the former originating in the distal end of 
subcostal; pterostigma linear in shape, the distal half consisting 
of a white proximal and a brown distal dot, the radial arising 
from the latter, the radial being three to four times as long as 
basal, slightly curved. Tegule and legs testaceous, cox black, 
femora brown except the distal end. Abdomen convex, smooth, 
shining, gradually tapering to a point. 
Length, 3 millimeters. 
MINDANAO, Butuan. 
Isobrachium luzonicum sp. nov. 
Female——Black. Head almost circular, scarcely longer than 
broad, smooth, shining, with few close punctures, eye hirsute, 
one-third longer than occiput; palpi pale. Antenna dark red- 
brown to brown-black, bare; scape as long as the three following 
joints together, second joint somewhat elongate, third to twelfth 
scarcely as long as thick, thirteenth oblong. Pronotum some- 
what longer than broad, smooth, shining, with rather large but 
not very close punctures. : 
Mesonotum two-thirds as long as pronotum, anterior half 
smooth, without punctures, posterior half finely and rather 
closely punctured. Scutellum without punctures, smooth and 
Shining, the depressions separated from one another by a carina. 
‘ Median segment as long as broad, transversely rugose, mar- 
ginate laterally and posteriorly, with three continuous, contig- 
uous longitudinal carinz slightly converging behind; posterior 
surface vertical, smooth, with a median longitudinal carina. Me- 
sopleura with few punctures; metapleura almost smooth. Wings 
slightly fuliginous; subcostal near to costal; pterostigma nar- 
