28 
The Philippine Journal of Science 
1921 
Antennal fossx (“Antennenvertief ungen” of Holmgren). — - 
The depressed lateral areas from which the antennae arise. 
Antennal foveolx (Fuller, 1915). — The pits from bottom of 
which the antennae arise. 
Margins of antennal foveolx. — Chitinous margin of antennal 
pits which is usually thickened, often raised, extended, or 
elaborated. 
Antennal carinx (“Antennenleisten” of Holmgren). — The 
ridges above, that is medial to, antennal fossae. 
MEASUREMENTS 
Body length. — By this I mean, unless otherwise stated, the 
distance in a straight line from that part of the head, with 
exception of the antennae or palpi, which happens to be most 
distal (with soldiers usually the tips of the mandibles, and with 
workers or adults the clypeus or labrum) to the posterior tip 
of the abdomen. As this measurement varies greatly with the 
position of the head, method of killing, preservation, etc., it 
should be used with caution in differentiating species. 
Body length without head. — From the anterior edge of pro- 
notum in the midline to the posterior tip of the abdomen. In 
using this and other measurements of body length it should be 
kept in mind that specimens preserved in alcohol often undergo 
a very distinct swelling, heavily chitinized regions becoming 
widely separated, as a result of which body length becomes con- 
siderably increased over that normal for the species in life. 
Head length. — In the soldier this is the distance from the pos- 
teriormost part of the head to tip of the mandibles. This dis- 
tance is usually measured with the head removed from the body 
and lying flat, in which case it is from the most posterior visible 
portion of the head in the midline to the tip of the mandibles ; or, 
if these are crossed, to a line from their anteriormost point 
making a right angle with the long axis of the body. It may be 
measured with the head lying on its side from the posterior line 
of the head to the distal tip of the mandibles. In the adult this 
is the distance from the posterior border of the head to the 
most distal part, usually the labrum. Here again we have a 
measurement which varies greatly in some species with the 
change in position of the mandibles, and it should therefore be 
used with caution. 
Head length without manclihles. — Measured, in soldiers, from 
the posterior line of the head to the labral suture, with the head 
