494 
The Philippine Journal of Science 
1920 
Luzon, Laguna Province, Paete, March 6, 1917 ; a vast num- 
ber of soldiers (both forms) and workers. 
Remarks . — Tunnels in a much decayed log. 
Pthinotermes (Schedorhinotermes) bidentatus sp. nov. Plate 2, figs. 
1 and 2; Plate 3, figs. 9, 10, 13, 14. 
Imago. — Unknown. 
Soldier ( the larger f on'm ) . — Head dark yellow ; antennse, labial 
palpi, and labrum somewhat paler; anteclypeus whitish; man- 
dibles reddish brown; pronotum and abdomen yellow. Head 
and sternites very sparingly provided with spiny hairs; abdom- 
inal tergites with a series of delicate hairs along the posterior 
border, a few scattered spiny hairs. 
Head quadrate, sides slightly converging anteriorly, posterior 
border broadly rounded; fontanelle distinct, directed obliquely 
forward, situated between roots of antennse; a shallow groove 
from fontanelle to tip of labrum, slightly widened anteriorly; 
clypeus nearly half as long as broad, anterior border rounded, 
boundary between anteclypeus and postclypeus indistinct; la- 
brum tongue-shaped, anterior border straight, middle part of 
lateral border swollen; antennse 16-jointed, basal joint cylindri- 
cal, second joint much shorter than third, fourth joint slightly 
shorter than second, nearly half as long as third, other joints 
spherical, subequal in length; mandibles rather short, with 
strongly incurved, piercing tip, the left with two triangular 
teeth, second tooth much smaller than the other, the right with 
two sharply pointed subequal teeth directed forward ; pronotum 
narrower than head, subreniform, anterior border convex, pos- 
terior border slightly incurved at middle, sides converging pos- 
teriorly ; mesonotum a little narrower than pronotum ; metanotum 
nearly as broad as mesonotum, posterior border straight; ab- 
domen ovoid; styli 2-jointed; hind legs reaching beyond tip of 
abdomen. 
Length of body 
6.00-7.00 
Length of head, with mandibles 
3.00 
Length of head, without mandibles 
2.00 
Width of head 
1.86-1.93 
Width of pronotum 
1.26-1.33 
Length of pronotum 
0.67 
Soldier ( the smaller form ). — Head dark yellow, antennse, la- 
brum, and clypeus somewhat paler; anteclypeus whitish; man- 
dibles yellowish brown ; thorax, abdomen, and legs yellow. Head, 
