AKT. 13. ANTS FROM HONDURAS AND GUATEMALA MANN. 6 



Among individuals from the same colony is considerable variation 

 in size, from 2.75 mm. to 4.25 mm. My workers, though smaller in 

 size than the type specimens, appear otherwise identical. 



GNAMPTOGENYS MORDAX (F. Smith). 



Honduras : San Juan Pueblo. 



The two colonies found were in partly rotten logs, nesting in bur- 

 rows made by wood-boring insects. My workers agree with a Bra- 

 zilian specimen from Emery's collection and differ from Smith's 

 description in having the second gastric segment not striate, but 

 regularly, sparsely, and rather coarsely punctate. 



GNAMPTOGENYS REGULARE Mayr. 



Honduras : Ceiba, Cecilia, San Juan Pueblo, Lombardia. 

 The commonest species of its genus in the districts visited. A 

 favorite nesting site is beneath the bases of palm fronds. 



GNAMPTOGENYS TORNATUM (Roger). 



Honduras: Ceiba, San Pedro Sula. 



GNAMPTOGENYS ANNULATUM Mayr. 



Honduras : Cecelia, Lombardia, Tela. 



GNAMPTOGENYS INTERRUPTUM Mayr. 



Honduras : Lombardia. 



One colony was found beneath bark on a rotting log. 



THAUMATOMYRMEX FEROX, new species. 



Worker. — Length 4.75 mm. (fig. 1). 



Head distinctly broader than long and much broader in front than 

 l-ehind, sides in back of eyes and the posterior border rounded, sides 

 in front of eyes projecting as lobes which 

 are .slightly shorter than the longitudi- 

 nal diameter of the eye. Clypeus de- 

 pressed and flat, broadly rounded an- 

 teriorly. Mandibles longer than the 

 head, very slender and spiniform, at 

 basal third with two very long spines, 

 the first of which is swollen at base and 

 slightly curved at tip, the second much 

 longer than the first and feeblv sinuate, fig. i.— thaumatomyrmbx fb- 



„",-, . ,,., t'ji 1 KOX, NEW SPECIES. HEAD OP 



Frontal carinae thick, moderately ele- worker. 



vated and projecting forward beyond 



the anterior border of clypeus. Antennal scapes surpassing the 



occipital corners by a little less than one-third their length, bent at 



basal three-eighths, moderately thickened apically; first funicular 



