HYMENOPTERA. 153 



altogether in one uniform direction, but in variously spreading 

 dense columns, now separating a little from the general mass, 

 now reuniting with it. The margins of the phalanx spread out 

 at times like a cloud of skirmishers from the vast army. I have 

 not been able to find their formicarium, and have not the least 

 idea how or where to find it." 



9. ECITON PACHYCERL'S. B.M. 



Worker. Length 2 lines. Chestnut-red : smooth and shining. 

 Antennae short and very stout, shorter than the thorax. Thorax 

 anteriorly shining, the metathorax opake ; the nodes of the pe- 

 duncle incrassate, subglobose ; the femora very slender at the 

 base, and incrassate towards their apex ; entirely destitute of 

 pubescence. 

 Hab. South America? (Coll. Gen. Hardwick.) 



This species is the only one of the genus which is apparently 

 quite destitute of eyes ; in E. legionis and E. pilosa they are 

 extremely minute, but we have failed, even with the aid of a 

 powerful microscope, in our endeavours to discover them in this 

 species. 



Genus 9. PSEUDOMYRMA. 



Pseudomyrma, Guer. Icon. Reg. Anim. 427 (1835-8). 

 Myrmex/Gwer. Icon. Reg. Anim. 427 (1835-8). 

 Leptalea, Spin. Mem. Accad. Torino, xiii. 68. 30. 

 Tetraponera, Smith, Ann. fy Mag. Nat. Hist. 2nd ser. ix. 44 (1842;. 



Antennae subclavate, 13-jointed in the females, 12-jointed in 

 the workers, not quite so long as the head and thorax, inserted 

 anteriorly on the face, approximating at their base ; mandibles 

 triangular, toothed on their inner margin; eyes largely deve- 

 loped, elongate-ovate, occupying a large portion of the head; 

 ocelli present in all the sexes. Thorax elongate ; anterior wings 

 with one marginal and three complete submargmal cells; the 

 second large, and extending to the apex of the wing. Abdomen 

 ovate, pedunculate, the peduncle with two nodes, the first smaller 

 than the second and pedunculate, the second node globose. 



Having obtained females of Pseudomyrma, and finding this 

 sex in every particular agreeing with the generic characters laid 

 down by Guerin, we have no hesitation in coining to the con- 

 clusion that the Pseudomyrmex is the female of Pseudomyrma. 



1. PSEUDOMYRMA BICOLOR. 



Pseudomyrma bicolor, Guer. Icon. Reg. Anim. 427 ? 



Smith, Trans. Ent. Soc. new ser. iii. 157. 1 ? . 

 Hab. Columbia. 



