1936] Crematogaster from Guatemala 47 
Crematogaster (Apterocrema) atitlanica sp. nov. 
Female. Length: 4.3-4.5 mm. 
Very similar to the female of sumichrasti but differing in 
the following characters : Head slightly narrower in propor- 
tion to its length ; eyes distinctly larger, very nearly as long 
as their distance from the anterior corners of the head; 
clypeus more flattened in the middle anteriorly, between the 
carinse, which are sharper than in sumichrasti. Wings 
absent, but tegulse of fore wings persisting as minute, elon- 
gate scales articulated to a small, heavily sclerotized and, in 
the pupa and callow, black area. Epinotal spines longer and 
usually more slender and more acute than in sumichrasti. 
Petiole and postpetiole narrower and less robust. 
In sculpture and pilosity very similar to sumichrasti, but 
the rugosity of the sides of the epinotum is sharper, as is 
also the punctuation of the petiole and postpetiole, the latter 
also longitudinally striolate. The sparse golden pilosity is 
as in sumichrasti, very long and conspicuous on the gaster 
and dorsum of the pedicel, thorax and head, shorter but 
coarse on the scapes, gula and legs. 
Black or very dark brown; thorax and pedicel in less 
mature specimens reddish brown, especially along the 
sutures; legs and antennae dark brown; mandibles, tips of 
scapes, clubs of funiculi, coxae, trochanters, tarsi and pos- 
terior borders of gastric segments brownish yellow. 
Male. Length 2. 5. -2. 8 mm. 
Structurally very similar to the male sumichrasti. Integ- 
ument thin and collapsible. Mandibles and antennae as in 
sumichrasti, the former small and acute but edentate, the 
latter usually 11-jointed, with the third joint (second funic- 
ular) entire or partially divided, sometimes 12-jointed, 
when the division is complete, more rarely 10-jointed. The 
three terminal joints are apparently stouter than in sumi- 
chrasti. Thorax wingless; with vestiges of tegulae as in 
the female. Volsella of genitalia much more expanded at 
the tip than in the male sumichrasti. 
Sculpture and pilosity as in that form. Ivory white; 
head, except the clypeus, mandibles and mouthparts, dark 
brown, especially posteriorly ; tibiae and gaster paler brown, 
segments of the latter dull yellowish at the base and along 
