434 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
and convex, situated at anterior third of head. Ocelli large, arranged 
in a triangle. Epinotal spines shorter than in the soldier. The rest 
similar to the soldier, with the usual sexual differences. 
Sculpture of head similar to that of soldier, except that the coarse 
striae extend onto the vertex and occiput. Thorax smooth and 
shining. Epinotum transversely striate. Nodes and a space at the 
base of the first gastric segment granulously punctate. Pilosity as 
in the soldier. 
Color dark fuscous, cheeks and clypeus lighter. Antennae and legs 
testaceous. Wings strongly infuscated; veins and stigma fuscous. 
Described from several workers and a single female collected at 
Madeira-Mamoré Camp 39. The color of the soldier is striking. 
The head is rich reddish brown, darker on the vertex and front and 
lighter on the cheeks and clypeus. The mandibles are a rich red 
wine-color. The thorax and epinotum are dark fuscous, the gaster 
is similarly colored, but with the first segment lighter basally. This 
species approaches P. susannae Forel from which it differs in the 
much longer and differently sculptured head, the feeble promesonotal 
impression, and in color. 
83. Pheidole (Pheidole) triconstricta Forel var. laidlowi, var. nov. 
Soldier. Length 3.5 mm. 
Head, excluding the mandibles, a little longer than broad, slightly 
broader in front than behind; posterior corners rounded; occipital 
margin rather deeply impressed; occiput at middle with a deep 
impression which extends to clypeus, becoming shallow anteriorly. 
Frontal carinae more than half the length of the scape, sharply defined. 
Eyes at sides of the anterior third of head. Mandibles convex, biden- 
tate, the teeth thick and subequal. Clypeus trapezoidal, flattened, 
truncate in front and behind, with a narrow median impression from 
middle of front extending two thirds the distance to base. Frontal 
carinae diverging behind. Antennal scapes reaching three fourths 
the distance to occiput. Antennal club a little shorter than the rest 
of the funiculus, funicular joints 2-7 broader than long. Prothorax 
rounded above, sides a little in front of middle drawn out angulately. 
Promesonotal impression distinct. Mesonotum seen from above 
trapezoidal, narrowed in front, deeply, transversely constricted at 
middle, the posterior portion elevated into a ridge. Mesoépinotal 
constriction deep and broad. Base of epinotum as long as declivity, 
