78 Psyche [Sept. -Dec. 
The eyes are flat and large, occupying more than half the sides 
of the head. The mandibles are yellow, with two large apical 
and three small basal teeth, all black; heavily striated. The 
clypeal lobe is rectangular and not excised. The scapes fail to 
reach the middle of the head. The head is evenly and densely 
punctate, opaque, devoid of erect hairs, but with fine white 
pubescence on the vertex. The prothorax is longer than broad, 
and distinctly margined on the sides; the mesonotal disc has 
an acute angle in front, behind it is semicircular. The epinotal 
base is longer than broad, broadest in front, narrowed behind, 
where it meets the epinotal declivity. The petiole is subtrian- 
gular from above, with convex sides and rounded posterior 
edge; the postpetiole is as long as broad and nodiform. The 
thorax in profile is slightly convex above with a strong depres- 
sion at the mesepinotal suture. The base and the declivity of 
the epinotum meet at a rather sharp angle. The node in profile 
is shaped as in P. sericea ; but has a pronouncedly backward 
curved anterio-ventral tooth (the tooth is triangular in P. 
sericea). 
The pilosity is sparse on the thorax, pedicel and abdomen, 
absent elsewhere. The pubescence is also sparse, except on the 
postpetiole and gaster, where it is relatively abundant, white 
and silky. The color is brownish-yellow, with the prothorax 
and petiole a little lighter; the head sometimes a little blackish. 
Mandibles and tarsi clear yellow. 
Habitat: Ancon, Canal Zone (Type locality). On Cordia 
allidora. Miraflores, Canal Zone. On Triplaris cumingiana. 
The specimens from Miraflores have the gaster subopaque 
(shiny in the specimens from the type locality). 
Cotype 20533, Harvard Collection, Mus. Comp. Zoology (21 
specimens). 
Pseudomyrma antiguana sp. nov. 
Worker. 
Length 5 mm. The whole body reddish brown, with the head 
and gaster dark reddish brown. Head and thorax densely and 
coarsely punctate, the rest of the body finely punctate and 
opaque throughout. The new form belongs to the branch Tri- 
angulinoda and is close to the bicolored species spinicola, which 
has a long peduncle with the faintest indication of an antero- 
ventral tooth, placed very close to the articulation with the 
epinotum. 
