1944] Genus Pseudomyrma 93 
nearly straight sides and weakly concave posterior border. The 
eyes are more than 1 /3 but less than 1/2 the length of the sides 
of the head. The mandibles are striate and not lighter colored 
than the rest of the head. Clypeal lobe straight in front. The 
scapes are short and thick and fail to reach the middle of the 
eyes. Antennal joints 3-7 very transverse. Head strongly 
punctate and opaque. The prothorax is considerably longer 
than broad and submarginate. The disc not semicircular in front 
but with a rounded angle; it is semicircular behind and sepa- 
rated from the epinotal base by a wide margin. The latter is 
suboblong of the same width most of its length, concave in front. 
The petiolar node is subhexagonal with rounded corners. The 
postpetiole is broader than long and nodiform. The gaster is 
slender, with subparallel sides. In profile the thorax is weakly 
concave above with a strong depression at the mesepinotal su- 
ture. The convex epinotal base is rounded into the short de- 
clivity. 
Head opaque, rest of the body subopaque. The pilosity is 
abundant, erect and of golden color. The pubescence is short 
and untidy; longer and more regular on the gaster, giving the 
latter a silky appearance. 
Habitat: The specimens from which the description was made 
were collected by N. A. Weber in Venezuela, at the mouth of 
the Orinoco. The identification was made by Weber. The type 
locality is Amazonas. 
Pseudomyrma triplaridis subsp. biolleyi subsp. nov. 
Worker. 
Length 4. 8-5. 2 mm. Head barely longer than broad, with 
convex sides, well rounded occipital corners and concave occipi- 
tal edge. The eyes are smaller than in the type, about 1/3 the 
size of the head, and flat. The mandibles are not paler than the 
head. (As in the type). The clypeal lobe is longer, and a little 
convex in front. The antennae are similar to those of the type. 
Head finely punctate and very shiny. Prothorax broader than 
its length in the midline, evenly convex and very smooth. Disc 
semicircular in front (angular in the type). The epinotal base 
is longer than broad, broadest at the level of the stigmata, the 
part in front of that level is subtrapezoidal ; the part behind 
that level gradually narrows towards the junction with the base. 
The petiolar node is globular above (as in some arboris-sanctce 
