76 
Psyche 
[June-Sept. 
the United States and S. cavernicola Borgmeier is found 
in Panama. Mr. E. C. Williams, Jr., collected in Panama 
a worker of this species which has been known only by the 
female. 
Alfaria so far is a strictly Neotropical genus of ponerine 
ants. Five species have been described from Colombia, 
Bolivia, Panama, Mexico and Costa Rica. Two new species 
are described below, one (A. panamensis) taken by Mr. 
E. C. Williams, Jr., on Barro Colorado Island and one (A. 
carinata) taken by myself in 1935 in British Guiana. The 
first biological notes on the genus, though very brief, were 
made on the Guiana species and are included below. 
All specimens are in the author’s collection. 
Probolomyrmex petiolatus, sp. nov. (Fig. 1) 
Worker. Length 1.6 mm. (thorax 0.61 mm.). Head in 
front view 1.4 times as long as broad, mandibles completely 
hidden from above, sides of head evenly convex, occipital 
margin feebly concave with angles evenly rounded; the 
Fig. 1. Probolomrymex petiolatus sp. nov., head of worker in lateral 
view. 
Fig. 2. Sysphincta cavernicola Borgm., petiole of worker in lateral 
view. 
Fig. 3. Alfaria carinata sp. nov., head of female in frontal view. 
