19 , 1 
Light: Notes on Philippine Termites, II 
55 
Cotypes. — No. 150 of general collection ( McGregor and Light ) , 
Rizal Province near Rizal-Bulacan boundary on Manila-North 
Road, September 29, 1920. 
DIAGNOSIS 
Adult. — Same as P. luzonensis but darker brown in color. 
Wings not known. 
Soldier. — Like P. luzonensis but smaller, slenderer, lighter in 
color, head smaller, antennae of 15 or 16 segments, segments 
longer and slenderer than in P. luzonensis ; compound eyes ves- 
tigial only, not protruding as in P. luzonensis; pronotum much 
smaller than in P. luzortensis. 
Worker. — Smaller, slenderer, lighter, antennae of 15 segments. 
DESCRIPTIONS 
Adult (dedlated) . — Agrees very closely with P. luzonensis; 
color above generally darker brown, possibly due to greater age 
of this specimen which has made its flight while those of P. lu- 
zonensis were taken from the nest in the winged state. Ante- 
rior wing scales very broad, posterior ends overlapping in the 
midline (possibly an abnormality). 
Large soldier. — In general like P. luzonensis but body smaller, 
about the size of the small soldier of P. luzonensis, slenderer, 
lighter in color, and less heavily chitinized ; head smaller, 
pale yellow posteriorly but mandibles as dark as in P. luzo- 
nensis; mandibles as long as or longer than in P. luzonensis 
but slenderer; antennse with 16 segments, third obconic, usually 
distinctly larger and more heavily chitinized than second or more 
distal segments ; other segments longer and slenderer than in P. 
luzonensis ; compound eye vestigial, not protruding at all, repre- 
sented by a vague white area invisible except under microscope ; 
anteclypeus extremely short; narrowest part of gula more pos- 
terior than in P. luzonensis; pronotum smaller in proportion 
than in P. luzonensis. 
Measurements of Prorhinotermes gracilis sp. nov., large soldier. 
mm. 
Body length 
5.75-6.00 
Head length, with mandibles 
2.30-2.50 
Head length, without mandibles 
Head width: 
1.50-1.60 
Maximum 
1.25-1.30 
Minimum 
0.90 
Pronotum width 
1.00-1.05 
Pronotum length 
0.45-0.48 
