188 
Journal of Agricultural Research 
Vol. XXIX, No. 4 
Pronotum white, tinged with yellow, 
saddle-shaped, emarginate anteriorly, 
sides sloping roundly to posterior 
margin, which is rounded, with scat¬ 
tered long hairs. 
Legs tinged with yellow, fairly 
elongate, slender, pubescent. 
Abdomen tinged with yellow, densely 
pubescent; cerci prominent. 
Measurements. —Length of entire 
soldier: 5.50-5.65 mm. Length of 
head with nasus.: 2.30-2.40 mm. 
Length of head with mandibles: 2.40- 
2.50 mm. Length of head to an¬ 
terior margin: 1.50 mm. Length of 
nasus: 0.85 mm. Length of left man¬ 
dible: 1.10 mm. Length of prono¬ 
tum: 0.35 mm. Length of hind tibia: 
1.30 mm. Width of head (at widest 
point posteriorly): 1.35-1.40 mm. 
Width of head at anterior margin: 
0.95 mm. Width of pronotum: 0.75 
mm. 
Fig. G—Armitermes ( Armitermes ) chagresi: Man¬ 
dibles of soldier, showing marginal teeth. (From 
drawing made by camera lucida) 
. Specimens of A. (A.) chagresi Snyder 
were first found at Barro Colorado 
Island, Canal Zone, on February 21, 
1924, by T. E. Snyder in a carton nest 
on the ground in the jungle (PI. 2, 
C, D). Formerly A. (A.) armigera 
Motschulsky was considered to be the 
only species in Panama; it was de¬ 
scribed from Obispo and I have seen 
the type at the Museum of Compara¬ 
tive Zoology, Cambridge, Mass.; cha¬ 
gresi is close to neoteinicus Holmgren 
and percutiens Emerson; the antennae 
are also different from those in armi¬ 
gera. Specimens of chagresi were also 
collected at Rio Chinilla, Canal Zone, 
on February 22, in a carton nest and 
in decaying logs; in these specimens the 
nasus is slightly longer and the head 
and nasus tend toward the convex in 
profile. In the genus Armitermes there 
appear to be either a large number of 
closely related species or much varia¬ 
tion within the species. 
Type locality. —Barro Colorado 
Island, Canal Zone, Panama. 
Described from a series of soldiers 
collected with workers at the type 
locality bv T. E. Snvder on February 
21, 1924. ‘ 
Type, soldier. —Cat. No. 273)/. 
U. S. National Museum. 
GENUS ARMITERMES WASMANN 
SUBGENUS RHYNCHOTERMES HOLMGREN 
In 1912, Holmgren established tho 
subgenus Rhynchotermes for Silvestri’s 
remarkable species nasutissimus from 
South America; this subgeneric name, 
derived from the Greek pvvxos (beak), 
is very appropriate and descriptive. 
This subgenus is monotypic. A much 
more striking and longer-beaked species 
has recently been found in Panama; 
the marginal teeth to the mandibles of 
the soldier are elongate and sharp- 
pointed and the anterior process on 
the coxa of the forelegs is more bent 
and hook shaped. It is a thoroughly 
armed species and runs about audaci¬ 
ously with its nasus or beak elevated 
at an angle of 45°, reminding one of 
an antiaircraft gun. 
Armitermes (Rhynchotermes) perar- 
matus, new species. 
Soldier (fig. 7). Head light cas- 
taneous brown, middle of beak and 
mandibles reddish brown, head short, 
pear-shaped, nasus very elongate, cur¬ 
ved downward and becoming gradu¬ 
ally attenuated toward apex; one row 
of hort hairs on head anteriorly. 
Mandibles very short, bent inward or 
hook-shaped, inner margin near tips 
not crenulate, near center of each man¬ 
dible a long, outward-curved, sharp- 
pointed marginal tooth. 
Antennae yellow-brown, elongate, 
slender, of 14 segments, with long 
hairs; third segment subclavate, as 
long as first, longer than second or 
fourth; fourth segment longer than 
second; fifth segment longer than 
fourth; segments gradually becoming 
shorter but broader toward apex; last 
segment subelliptical. 
Pronotum light yellow-brown, darkei 
on margins, saddle-shaped, slightly 
broader than long, high and roundly nar¬ 
row at anterior margin, where emargi¬ 
nate, broadly rounded posteriorly. 
