of Pseudomyrma and Tetraponera. 65 



the basal segment of the abdomen ; the eyes large, oblong- 

 ovate, jet black, and about half the length of the head; 

 the head oblong, widest in front, and moderately narrowed 

 posteriorly. Thorax oblong, strangulated in the middle; 

 the metathorax obliquely truncate. The petiole of the 

 abdomen short; the first node oblong, the second globose, 

 the abdomen oblong-ovate ; pointed at the apex. 

 Hah, — St. Paulo. Type in the British Museum. 



51. Pseudomyrma urbana. 



"Worker. — Length 2 lines. Reddish-yellow, the femora, 

 the apex of the abdomen, and its base at the sides, more 

 or less fuscous ; the insect smooth and shining, the head 

 and thorax brightest. The head oblong, the sides nearly 

 parallel but slightly narrowed behind; the eyes black, 

 very large, more than half the length of the head, in- 

 cluding the projected mandibles. The thorax oblong, 

 constricted in the middle, posteriorly rounded and oblique. 

 The petiole of the first node of the abdomen short, the 

 node subglobose; the second node globose. 



Hab. — Ega on the Amazon. Type in the British 

 Museum. 



52. Pseudomyrma fervida. 



Worker. — Length 2 lines. Head and thorax ferru- 

 ginous, the abdomen obscure. Head oblong, the eyes 

 large and black ; the head anteriorly, the mandibles, and 

 basal half of the antennas, pale ferruginous ; covered very 

 thinly with grey pile and with a few erect whitish hairs 

 on the face and vertex. Thorax darkest above, and with 

 a pile and pubescence similar to that on the head ; the 

 legs rufo-piceous above. Abdomen obscure rufo-fuscous, 

 covered with a grey pile and having a few scattered erect 

 hairs; the first node clavate, the second wider and sub- 

 globose. 



Hab. — Mexico. 



53. Pseudomyrma volatilis. 



Male. — Length 4 lines. Kufo-testaceous, Avith the 

 thorax black aboAC. Head transverse, narrowed beliind, 

 with the eyes large and prominent; the head, basal joint 

 of the antennas in front, and the mandibles, pale rufo- 

 tcstaccous, with the vertex black. Thorax palest beneath, 

 wilh the mesothorax and scutellum black; wings suIj- 



