1925 ] Guests of Eciton hamatum Collected by Prof. Wheeler 173 
border a flat impressed surface more shining than the rest; 
broadly triangularly excised behind, separated from gular plate 
by distinct transverse line; gular plate not incised. 
Mesosternum with a pair of very profound pits adjacent 
to and inward from the coxae. 
Legs moderately long, shining; anterior and middle tibiae 
rather flat, the middle pair subangulately enlarged in front of 
middle of outer border, concave posterior to this, then roundly 
enlarged and convex to tip; hind femora about as long as tibiae, 
strongly convex on outer and concave on inner surface, thickened 
at apex; very coarsely and sparsely punctate on outer surface; 
tibiae projected and rounded at middle of outer border, the margin 
concave on either side, margin on basal half with a series of seven 
short serrate teeth, outer surface strongly convex and over- 
lapping at basal margin, with a very strong impression parallel to 
the basal two-thirds of margin; inner surface broadly concave, 
with an impressed marginal line parallel to the lower border and 
one parallel to the inner border of the tarsal grooves. 
Hairs erect, very stiff and abundant on dorsal surface, 
longer and with flexuous tips on margins of legs, the pygidium, 
and ventral surface. One specimen is an exception in having 
the hairs equally abundant, but all longer, flexuous, the others 
appearing as though they had been neatly trimmed. 
Type locality. — Barro Colorado, Panama. August 1, 1924. 
W. M. Wheeler. 
Host. — Eciton hamatum (Fab.) 
Described from five specimens. 
T. dasypus Bick. from Bahia, the type of the genus, lacks 
the distinctive punctures on the pronotum, where there are 
only two strong lateral impressions, and the inner is rounded 
instead of angulate and the sutural and approximate dorsal 
striae are indicated by impressed, smooth lines. Bickhardt’s 
specimen had sparser, very much finer pilosity than any of my 
series. 
Euxenister wheeleri sp. nov. (fig. 1.) 
Length 4.5 mm. 
Form elongate, subopaque; mandibles, legs, and ventral 
surface moderately shining; brownish red; hairs of two kinds, 
