148 Zoologica: N. Y. Zoological Society [III; 4 



Worker. Length: 1.4-1.6 mm. 



Slightly smaller than the worker of the typical form, some- 

 what darker brown, with distinctly shorter antennae, the scapes 

 reaching back beyond the border of the head only to a distance 

 equal to their greatest diameter. Head shorter, with more dis- 

 tinct posterior corners. Epinotal spines somewhat smaller. 



Described from several specimens found with brood in a 

 young Tachigalia petiole near Kartabo. The types of the species 

 were collected by Dr. F. A. Lutz at Kaieteur, British Guiana. 



9. — Pheidole tachigaliae sp. nov. 



Soldier. Length: about 2 mm. 



Head large, subrectangular, about one-quarter longer than 

 broad, as broad in front as behind, with rather straight, sub- 

 parallel sides and deeply, angularly excised posterior border, 

 vertex with a large and rather deep impression, without a median 

 groove between it and the frontal area where the head is uni- 

 formly convex. Gular teeth small and blunt. Eyes small and 

 moderately convex, only about their own length distant from the 

 clypeus. Frontal carinae long, very far apart, curved, gradually 

 diverging behind towards the posterior corners of the head, 

 forming the inner borders of broad, shallow, but distinct scrobes 

 for the antennae. These scrobes and the frontal carinae reach 

 nearly to the posterior corners of the head. Mandibles stout and 

 very convex, with a pair of blunt, apical teeth. Clypeus flat, 

 ecarinate in the middle, its anterior border somewhat refuse, 

 feebly sinuous in the middle and on each side. Frontal area 

 rather large, triangular, shallow, with a small median pit. 

 Antennae slender, scapes curved, not incrassated or flattened but 

 slightly enlarged distally, reaching nearly to the middle of the 

 lateral borders of the head ; antennal club somewhat shorter 

 than the remainder of the funiculus, its two basal joints sub- 

 equal, broader than long, together equal to the terminal joint; 

 first funicular joint large ; joints 2-6 small and transverse. 

 Thorax very short, broad through the humeri which are promi- 

 nent and subangular; promesonotal suture distinct but not im- 

 pressed. In profile the pro- and mesonotum form together a 

 high hemispherical mass, the mesonotum descending abruptly 



