30 
Psyche 
[Mar. 
Leptothorax, subg. Myrafant, new subgenus 
Type: Leptothorax curvispinosus Mayr. By present designa- 
tion. 
This subgenus includes such common North American forms 
as fortinodis Mayr, rugatulus Emery, longispinosus Roger, 
teccanus W. M. Wheeler, tricarinatus Emery and many others. 
For a list of forms see Emery, 1922 (in Wytsman’s, Genera 
Insectorum, fascicule 171 c: 251-259). 
The worker has 11- or 12-segmented antennae; thoracic 
humeri usually rounded, occasionally subangular ; mesoepinotal 
impression on the dorsal surface of the thorax usually absent, 
if present, scarcely perceptible. 
In the preparation of a catalogue of Nearctic ants, it was 
noted that Goniothoraoc Emery, 1896, is preoccupied b} T 
Gonio thorax ' Milne-Edwards, 1879. As Nesomyrmex W. M. 
Wheeler is the next available name, it supplants Goniothorax 
Emery. The synonymy is as follows: 
Leptothorax subg. Nesomyrmex W. M. Wheeler 
Leptothorax , subgenus Goniothorax Emery, 1896, Bol. Soc. 
Ent. Ital. 28:26, 58. Preoccupied. Type: Leptothorax vicinus 
Mayr. Designated by W. M. Wheeler, 1911. 
Nesomyrmex W. M. Wheeler, 1910, Bui. Amer. Mus. Nat. 
Hist. 28:259. Type: Nesomyrmex clavipilis W. M. Wheeler. 
Monobasic. 
Caulomyrma Forel, 1911, Bui. Soc. Vaud. des Sci. Nat. 50: 
233. T}^pe: Leptothorax echinatinodis Forel. Original designa- 
tion. 
Most of the ants of this subgenus occur in the Ethiopian, 
Oriental and Neotropical Regions. Our only known North 
American species is wilda M. R. Smith, from extreme southern 
Texas. 
