1926 ] 
Some New N eotropical Ants 
99 
Shining. Mandibles with short, coarse striae; head and 
body with distinct, widely separated punctures, coarsest and 
most abundant on the mesonotum, finest on the gaster. 
Suberect, fine yellowish hairs rather sparsely distributed on 
head, body and appendages. 
Color pale to rather dark brownish yellow. 
Worker minor. Length 1 .5 mm. 
The smallest specimens in the colony differ in having the 
head one and two thirds times as long as broad, with straight 
sides (convex in the larger workers) and more deeply excavated 
posterior border and the meso-epinotal impression feebly im- 
pressed. 
Type locality . — La Palma Davila, Lower California. 
Cotypes. Cat. No. 29046 U. S. N. M. 
Described from a series of 33 workers taken by the writer 
from a cluster beneath a stone. Among them were numbers of a 
Staphylinid beetle, which I have recently described as Pulico- 
morpha coccum. 
Eciton peninsulare is related to Eciton calif ornicum Mayr, 
but much smaller in size and distinct in the absence of eyes, the 
more elongate head, as well as the smoother, more shining and 
sparsely punctate integument. 
Eciton (Acamatus) sumichrasti Norton. 
Female . — Length 11.5 mm. 
Head from the front about as long as broad, slightly broader 
in front than at occipital border, sides feebly rounded, occipital 
border emarginate, occiput and vertex with large impressed 
areas; vertex and front with a median longitudinal groove that 
becomes stronger anteriorly and terminates at posterior border 
of clypeus. Ocelli lacking; eyes of a single, white facet, situated 
a little behind middle of sides of head. Mandibles slender, 
thickest at middle, nearly straight, their tips obtusely pointed. 
Median, triangular portion of clypeus longer than broad, an- 
terior border very feebly emarginate. Frontal carinse anteriorly 
rather acute above, posteriorly broad and convex. Antennal 
scapes robust, clavate, about half as long as head; funiculi more 
