392 Bulletin American Museum of Natural History. [Vol. XXXIV, 
Subfamily DoryLin2. 
7. Eciton (Acamatus) leonardi sp. nov. 
Worker. Length 2-3 mm. 
Head distinctly longer than broad, slightly broader in front than behind, with 
feebly convex sides and feebly excised posterior border. Eyes absent. Mandibles 
with 4 teeth, a prominent one at the tip and one at the base of the apical border and 
two smaller ones near the tip and separated by a concave diastema from the basal 
tooth. Antennal scapes slender at the base, but rapidly enlarging towards their tips, 
less than half as long as the head; funiculus not enlarged distally, joints 2-6 slightly 
broader than long, remaining joints at least as long as broad. Thorax less than 3 
as broad and about as long as the head including the mandibles, slightly broader . 
anteriorly, with distinct mesoépinotal and, in the large worker, very feebly indicated 
promesonotal suture, and slightly constricted at the former. Pronotum without a 
transverse anterior carina, about twice as long as the epinotum, in profile feebly 
rounded dorsally and a little higher than the epinotum; base and declivity of the 
latter subequal, the base with a somewhat triangular impression in the middle line 
at its anterior border. Petiole from above rectangular, about ¢ longer than broad, 
with straight, subparallel sides, in profile convex and evenly rounded above, its ventral 
surface slightly concave and with a smali blunt tooth anteriorly. Postpetiole 
broader than long, distinctly broader than the petiole, a little broader behind than 
in front, with straight anterior and posterior borders and rounded sides. In profile 
this segment appears much shorter than high and has a distinct tooth at its antero- 
ventral border. Gaster oval, pointed, somewhat larger than the head. Legs rather 
short and slender; tarsi with simple claws. 
Shining: mandibles rather coarsely striatopunctate: head and prothorax.covered 
with sparse, rather coarse, piligerous punctures; on the remainder of the body these 
punctures are finer and much less conspicuous. Impression at base of epinotum: 
slightly opaque and transversely shagreened. 
Hairs pale yellow, only moderately long and abundant, erect or suberect on the 
body, legs and scapes; shorter on the funiculi; pubescence very sparse but rather 
long, visible on the gaster and posterior portion of the head. 
Reddish yellow; clypeal region and mandibles red, the teeth of the latter black. 
Described from three workers taken by Mr. Percy Leonard on Point 
Loma near San Diego, California. This species belongs to the group of 
small Ecitons including E. californicum Mayr, nitens Mayr, commutatum 
Emery, pauxillum Wheeler and angustinode Emery. From pauxillum it is 
readily distinguished by its greater size, the shape of the head, mandibles 
and pedicel; from angustinode by the greater size, much broader pedicel, 
more slender antenne, shining epinotum, etc.; from californicum by the 
shape of the head, mandibles and pedicel, shorter thorax and different sculp- 
ture; from nitens by its smaller size and the absence of a pronotal carina, 
the shape of the mandibles, etc.; from commutatum by the shape of the 
mandibles, more slender antenne and much feebler mesoépinotal suture. 
