34 HYMENOPTERA. 



and covered with a silky cinereous pile. Head emarginate be- 

 hind. The thorax deeply strangulated at the base of the meta- 

 thorax; the scale of the peduncle narrow, incrassate, obtuse 

 above. Abdomen ovate, black, and covered with grey silky pile. 



Hab. Port Natal. 



This species is attached by its mandibles to the leg of a species 

 of Pans us. 



115. FORMICA LACTEIPENNIS. B.M. 



Female. Length 4 J, lines. The head, thorax and abdomen 

 above brown-black, the two latter pale testaceous beneath ; the 

 flagellum, mandibles and legs testaceous; the tibia3 and tarsi 

 rather darker than the femora ; the head oblong, slightly emar- 

 ginate behind ; the metathorax testaceous, more or less dusky 

 above ; the scale of the peduncle pale testaceous, ovate, notched 

 above ; the wings milky-white, the nervures pale testaceous 

 yellow ; the abdomen ovate, its base and the apical margins of 

 the segments pale testaceous ; the insect is smooth and shining. 



Worker major. Length 41- lines. Black: the flagellum and 

 legs rufo-testaceous, the tarsi dusky; head very large, deeply 

 emarginate behind ; thorax narrow, widest in front, compressed 

 behind; the diskal line of the thorax curved from the base to 

 the apex; the scale pale testaceous and narrow, its margin 

 entire ; abdomen ovate, with the apical margins of the segments 

 and the base beneath pale testaceous. 



Worker minor. Length 4 lines. Head elongate, much nar- 

 rowed behind the eyes, the latter rather large and ovate ; face 

 anteriorly, the clypeus, palpi, flagellum, and extreme base and 

 apex of the scape, pale ferruginous ; the scape fusco-ferruginous. 

 Thorax elongate, narrow, compressed behind, pale rufo-testa- 

 ceous, with the disk of the thorax slightly fuscous. Abdomen 

 ovate, the base arid the scale of the peduncle pale rufo-testaceous ; 

 the scale incrassate, elongate, narrow, rounded above. 



Male. Length 3 lines. Head, antennae, thorax, legs, and 

 scale of the peduncle, pale rufo-testaceous ; the head and abdo- 

 men small, the latter fuscous ; the wings milky-white, the ner- 

 vures yellow ; the scale of the peduncle incrassate, quadrate, and 

 deeply notched above. 



Hab. Port Natal. 



The sexes of this species were taken from the nest, which is 

 usually constructed in fallen timber; collected by Mr. R. W. Plant. 



116. FORMICA COSMICA. B.M. 

 Worker major. Length 3 lines. Black : the head and 



