104 
Psyche 
[August-October 
Mesoepinotal impression strong. Base of epinotum somewhat 
transverse, longer than the declivity and narrowly rounding into 
it; with a pair of acute triangular spines, nearly as long as their 
distance apart at base. Petiolar peduncle nearly as long as the 
node, which in profile is conical and as high as long, and from 
above elongate oval. Postpetiole longer than broad and twice 
as broad behind as in front, sides nearly straight, in profile much 
longer than broad, convex above. Femora slender basally and 
clavate apically ; tibiae stout. 
Gaster and post petiole, mandibles and legs shining, the 
remainder feebly shining. Mandibles sparsely punctate. Clypeus 
and middle of front smooth, remainder of head rugulose-punctate 
and with sparse striae which are longitudinal on front, reticulate 
on occiput and diagonal on cheeks. Promesonotum sculptured 
like the head, with the striae irregularly longitudinal. Epinotum 
and meta- and epipleurae and petiolar peduncle cribrately punc- 
tate. Petiole, postpetiole, gaster and legs smooth. 
Hairs long, erect and very fine, moderately abundant on 
thorax and abdomen, shorter and semirecumbent on head and 
appendages. 
Rather pale reddish brown; legs, tip of antennae and often 
the petiole and gaster yellowish. 
Type locality. — Hamburg Farm, Reventazon, Santa Clara, 
Costa Rica. 
Cotype. — Cat. No. 29049 U. S. N. M. 
Mr. F. Nevermann found the colony in a rotten log, in 
company with Euponera ( Trachymesopus ) stigma Fabr. 
Erebomyrma longi Wheeler, from Texas, differs in having the 
head longer and, in profile, much thinner, the humeri are not 
angulate, the anterior border of pronotum, not margined, the 
epinotal spines shorter and the post petiole transverse, as well 
as in its finer sculpture and paler color. 
Strumigenys (Tingimyrmex), new subgenus. 
Head elongate, not strongly excised behind. Mandibles 
short, remote at base, with a series of microscopic teeth at apical 
third. Antennal scrobes deep and broad and extending length of 
