78 
Psyche 
[June-Sept. 
is known only from the unique female the characters given 
above are probably common to both female and worker 
castes. The boliviensis female measured 2.8 mm. which may 
be longer than the unknown female of the Panamanian spe- 
cies. This species also differs from the two Old World species, 
P. ftliformis Mayr of West and South Africa and P. dam- 
mermani Wheeler of Java, in having the petiole pedunculate 
behind. P. filiformis is much larger (3 mm.), has a much 
more massive node, longer antennal joints, etc. P. dammer- 
mani has a much more angulate epinotum and lacks a dis- 
tinct petiolar node. 
Discotliyrea isthmica, sp. nov. 
Female (Dealate) . Length 1.2 mm. (of thorax 0.57 mm.) 
Head, excluding mandibles, about 11/6 times as long as 
broad back of eyes, evenly rounded behind, anterior margin 
produced as a convex lobe, slightly emarginate medially, 
which covers the mandibular bases, eyes large, convex, 
situated a distance of about one-half their diameters from 
the mandibular insertions, the three ocelli large and promi- 
nent ; lamina between the antennal insertions large, rectangu- 
lar with rounded angles, the anterior margin very slightly 
produced; antennae 9- jointed, antennal scapes, bent, clavate, 
extending to a level with the posterior margin of the eyes and 
distinctly not reaching a level with the anterior ocellus ; 
funicular joints 2-7 transverse, gradually increasing in 
length distally, terminal joint ovate, as long as all preceding 
joints; mandibles trigonal, strongly convex, edentate except 
for a long, acute apical tooth, the cutting surface concave. 
Pronotum produced anteriorly as a slight collar, inferior hu- 
meral angles obtuse, thorax evenly rounded at margins, 
epinotal angles marked as distinct, rounded tubercles. Node 
of petiole in side view an acute angle rounded apically, from 
above nearly twice as broad as long with feebly concave 
anterior margin and feebly convex lateral margins, petiole 
ventrally with a lamina projecting anteriorly between the 
hind coxae and with a rounded, obtuse angle posteriorly. 
First gastric segment in side view with gently convex 
dorsum, anterior margin straight and forming an acute 
angle with the dorsum and an obtuse angle with the straight 
