1925] Guests of Eciton hamatum Collected by Prof. Wheeler 167 
punctures near posterior border and third segment with a much 
sparser row; legs with long and fine hairs mixed at apices of 
tibiae with setae; coxae and femora distinctly and regularly punc- 
tate. 
Head, seen from beneath, about as long as broad, vertex 
moderately convex, front strongly convex, subcarinate at 
middle; clypeus submembraneous at anterior border, the border 
broadly arcuate. Labrum transverse, broadest in front, convex, 
anterior border broadly and feebly concave. Antennae com- 
pressed, basal joint longer than the following two, second joint 
longer than broad and longer than the third, joints three to ten 
transverse, terminal ovate, narrow at tip, shorter than two 
preceding joints together. Pronotum transverse, behind as 
broad as base of elytra, sides arcuately narrowed to front border, 
which is shallowly and rather narrowly concave at middle; 
surface convex. Elytra convex, sides very feebly arcuate in 
front, more strongly behind middle, posterior corners only 
slightly projecting, subangulate, border concave at sides, then 
nearly straight. First three abdominal segments with spinose 
processes at sides, apex with four teeth visible from above, the 
two at middle conspicuously larger than the others and rounded 
at tip. 
Type locality . — Barro Colorado, Canal Zone, Panama. 
August 1, 1924, W. M. Wheeler. 
Host. — Eciton hamatum (Fab.) 
Described from two specimens. 
This is close to X. clypeatus Wasm., which lives with the 
same species of Eciton in Santa Catherina, Brazil, but differs 
from Wasmann’s description and figures of that species in having 
the front of head narrower, the clypeus less emarginate at border, 
the labrum broader and not narrowed apically, the antennal 
joints broader and the sides of elytra less convex in outline. 
Leptonia (s. 1.) hospes sp. nov. 
Length 1 .75 to 2 mm. 
Form elongate, moderately shining, except posterior half 
of abdomen, which is strongly shining above; head, thorax, and 
elytra coriaceous, abdomen microscopically punctate. Head, 
