44 The Philippine Journal of Science 1921 
Measurements of Planocryptotermes nocens sp. nov., winged adult. 
mm. 
Body length, with wings 
8.5-9.00 
Body length, without wings 
5.0-5.50 
Head length 11 
1.16 
Head width 
1.08 
Pronotum width 
1.01 
Pronotum length 
0.63 
a Posterior margin to middorsal margin of frontal area. 
Soldier . — Mandibles and frontal area of head, with its margin, 
black, the rest of the head shading from smoky brown in front 
to dirty yellow at posterior surface; thorax and legs smoky, 
abdomen light smoky yellow, having a faint purplish tinge. An- 
tennte and mouth appendages light yellow to white. Head mak- 
ing an angle of about 45° with the body, short, broad, and square, 
being only slightly longer than broad and about half as high as 
long and showing scattered hairs, which are smaller and more 
numerous toward the anterior ; anterior surface making an angle 
of more than 90° with the mandibles; posterior border nearly 
straight in dorsal view, with shortly rounded corners ; sides and 
posterior surface of head sloping inward and upward to dorsal 
surface from a line of maximum convexity considerably below 
the mid-horizontal plane of the head; sides of head nearly 
straight and parallel. 
Eyes small, hyaline and circular, lying in a considerably larger, 
circular elevation of the lateral surface of the head, about 
one and a half times their diameter from posterior margin of the 
antennal foveolae, making a distinct lateral projection in dorsal 
view in front of which the sides converge slightly only to diverge 
in the low but distinct margin of the frontal area, so that the 
width of the head from edge to edge of the frontal margin would 
about equal that through the eyes; in dorsal profile the head 
in side view presents a sharp rise posteriorly from the border 
to a point one-third the distance between the posterior border 
and the margin of the frontal area; from this point there 
is a very gentle down curve to near the frontal margin and a 
short but distinct rise to the anterior edge of the projecting 
margin ; dorsal surface with a very small concavity just posterior 
to the middorsal region of the margin of the frontal area ; frontal 
margin less developed in middorsal region where it shows a 
distinct median notch, flanked on either side by a much smaller 
lateral notch and a second very slight notch ; the margin, slightly 
roughened laterally to these notches, curves anteriorly, laterally, 
and ventrally to end in the dorsal margin of the antennal foveola 
