74 
Psyche 
[March 
postpetiolar dorsum very finely and densely sculptured, usually strio- 
late with interspersed shallow punctulation, and opaque or nearly so, 
but two samples from Tambahredjo in Surinam have the petiole and 
postpetiole smooth and shining, with only the usual abundant fine 
punctures. Of special interest is the occurrence, in two of the above 
samples (Peru: Finca Santa Beatriz, Chanchamayo, io°57’S, 
75°i2’N, iooo m, C. A. Portocarrero leg., No. 88-SB29, 11 July 
1964. Brazil: Utinga tract, near Belem, Para, P. F. Darlington 
leg., No. 335, Aug. 24, 1962) of a small, square to sharply trapezoi- 
dal lamellar lobe or process on the median anterior clypeal margin. 
This process is variable in shape and size, and is transparent and thus 
very difficult to see unless the mandibles are open at least partly. It 
appears to represent a modification of the lamellar free clypeal margin 
seen in other samples. This margin is usually evenly convex, but some 
Surinam specimens show a tendency for its most central part to form 
a narrow, shallow truncate lobe. Such a character would normally 
separate good species among ponerine ants, but the overall variation 
in the small Typhlomyrmex calls for caution and more than the 
present meager material before we draw new species boundaries. 
The wings of the female of this species are atypical for Typhlomyr- 
mex, in that M leaves Cu distad of cu-a, and the crossvein r-m is 
missing, so that the cubital cell is open at its apex. 
The Santa Beatriz collection was made from a single chamber about 
4 mm in diameter, located in the ground; Portocarrero found there 
21 workers and one queen, plus 8 pupae, 1 larva, and 10 eggs. The 
Utinga collection came from a red-rotten root in rain forest. 
Typhlomyrmex rogenhoferi (Figures 3, 8-1 1) 
Typhlomyrmex rogenhoferi Mayr, 1862, Verh. Zool.-bot. Ges. Wien, 12: 737, 
worker. Type locality: “Amazonas.” 
Typhlomyrmex Rogenhoferi r. robustus Emery, 1890, Bull. Soc. ent. Ital., 22: 
40, worker. Type locality: Alajuela, Costa Rica. Syn. Brown, 1957. 
Typhlomyrmex robustus subsp. manco Wheeler, 1925, Ark. f. Zool., 17A 
(8): 2, worker. Type locality: Pablobamba, Peru. Syn. Brown, 1957. 
Centromyrmex sculpturatus Santschi, 1931, Revista Ent., Rio de Jan., 1: 266, 
dealate female. Type locality: Panama Canal Zone. Holotype examined 
in Naturhistorisches Museum, Basel. New synonymy. 
Easily recognized by the relatively large size, triangular mandible 
and shape of the petiolar node in worker and female. The male can 
be recognized by size, the distinct angle between basal and masticatory 
borders of the mandible, and by the distinctive volsella of the genitalia. 
Interesting Brazilian records for the species have been furnished 
by W. W. Kempf from his collection : Goias State, Goiaffiia, 
Campinas ( Schwarzmaier leg.). Espirito Santo State, Santa Teresa 
