96 Psyche [Sept.-Dee. 
ing but three to four long hairs on the gaster, and with the 
pubescence so short and sparse that only careful observation 
reveals its presence in a few spots. Size 2.2 mm., including the 
mandibles. 
Type locality: Lima, Peru. 
The new species is related to P. subtillissima. It differs from 
tenuissima by the broader head and thorax, from the type by 
the almost complete absence of hairs, and from the var. andina 
by sculpture and other characters. 
Holotype No. 77, Haskins Collection. 
Pseudomyrma voytowskii var. costaricensis var. nov. 
Worker. 
Larger than the type; length 4.2 mm. Of the same general 
appearance as P. voytowskii and with a similar color pattern. 
The head is very dark reddish brown, with the mandibles, cly- 
peus and antennae yellow. The scapes are browned in the mid- 
dle. The head is subopaque (shiny in the type). The pilosity is 
more abundant in the type. 
Type locality: San Jose, Costa Rica (Wheeler Coll.). 
Holotype No. 87, Haskins Collection. 
Pseudomyrma weberi sp. nov. 
Worker. 
Described from specimens in the Harvard Collection, errone- 
ously labelled “subsp. of P. caroliP 
The new species belongs to the branch Apedunculata which 
has a short petiole; it is near P. allidora and P. acanthobia. 
Length 3.8-4 mm. Weakly bicolored. Head dark reddish 
brown; mandibles, clypeus and antennae yellow brown. Head 
subrectangular, 11/3 times as long as broad, with slightly con- 
vex sides and convex posterior border. Eyes occupying less than 
half the sides of the head. Clypeal lobe narrow, relatively long 
and concave in front. Scapes reaching the middle of the head. 
Head finely punctate and a little shiny (P. acanthobia has the 
head very concave behind and shiny; P. allidora has the head 
much longer, concave behind and very opaque). Prothorax 
longer than broad and not marginate (broader than long in 
acanthobia) . The mesonotal disc is angulate in front (rounded 
in acanthobia , angulate in allidora). The epinotum is shaped 
as in allidora and is narrower behind; the anterior edge is 
straight (angulate in acanthobia , semicircular in allidora). 
