50 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
ONYCHOMYRMEX HEDLEYI Emery. 
Plate st; dies 2: 
Emery, Ann. Soc. ent. Belg., 39, 1895, p. 350, f. 2. 8; Gen. 
Insect., 1911, fase. 118, p. 97, pl. 3, f. 9, 9b; Forel, Arkiv. f. zool., 
1915-92 7p..3, pl, 1: 37 B8.oN(h): 
Worker. Length 3.5-4 mm. 
Head about 1} times as long as broad, subrectangular, a little 
broader in front than behind, with straight sides and posterior border 
and rounded posterior corners. Clypeus with the anterior border 
slightly flattened, arcuately rounded in the middle, sinuate at the sides, 
its edge beset with about 20 minute, regular teeth. Eyes with about 
6-8 minute ommatidia, situated 2 the length of the head from the 
anterior margin. Mandibles with long, abruptly incurved apical 
tooth and seven basal teeth of different sizes, the two in the middle 
of the series largest and directed backward. Antennae slender, 
scapes fully $ as long as the head, first and last funicular joints twice 
as long as broad, remaining joints about 13 times as long as broad. 
Thoracic sutures all strongly impressed; pronotum convex above, 
especially in front, with convex sides, a little longer than broad; 
mesonotum nearly twice as broad as long; epinotum longer and nar- 
rower than the pronotum, longer than broad, with feebly convex sides 
and separated in dorsal view from the pronotum by a pronounced 
impression on each side. In profile the thorax is distinctly impressed 
at the mesonotum, the base of the epinotum is nearly twice as long 
as the straight declivity into which it passes through an obtuse 
angle. Node of petiole in profile with rather straight anterior slope 
and convex summit, slightly concave at the posterior border; from 
above the node is as long as broad, rounded in front, with straight 
posterior border; ventral projection long and blunt, compressed and 
somewhat translucent. Postpetiole as long as broad, first gastric 
segment a little longer than the postpetiole. Legs slender. 
Very smooth and shining; mandibles, clypeus, and cheeks sub- 
opaque, the mandibles finely striated, the clypeus and cheeks finely 
rugulose-punctate. Body with fine, sparse, piligerous punctures, 
which are most numerous on the head, especially on its sides. 
Hairs delicate, pale yellowish, short, suberect, covering not only 
the whole body, legs, and antennal scapes but also the funiculi; 
