HYMENOPTERA. 29 



form of the vvoiker, fi lines in length ; the head much wider 

 than the thorax or abdomen, and deeply cmarginate behind ; 

 eyes ovate, placed inwards opposite the termination of the 

 carina; which run upwards from the base of the clypeus ; the 

 cly])eus with a central longitudinal carina; the llagellum ferru- 

 ginous ; the thorax and legs rufo-testaceous, the disk of the 

 former more or less black or fuscous above ; much compressed 

 towards the apex ; the tibia; and tarsi more or less fuscous, the 

 former sometimes black. Abdomen ovate, with a pale testaceous 

 macula on each side of the three basal segments. 



Worker minor. Length 5 lines, some examples smaller. — This 

 form differs in having the head elongate, about the same width 

 as the abdomen, and the legs and thorax are usually paler than 

 in the larger form ; in some examples the head and thorax are 

 pale red. The female resembles the smaller form of the worker, 

 in having the head elongate, very little wider than the thorax ; 

 the thorax elongate-ovate ; the abdomen ovate, the maculation 

 very dark and decided. 



Amongst a series of specimens of this species from Port Natal, 

 some of the small forms of the worker have the head, thorax and 

 legs entirely pale rufo-testaceous; s]3ecimens of the large worker 

 also occur with the head fuscous anteriorly, and the vertex red ; 

 the thorax is also occasionally entn-ely red. Specimens of what 

 is in all probability the male, have the head very small, the eyes 

 black, ovate and prominent, the whole body of the insect being 

 pale rufo-testaceous; the head rounded behind the eyes, and 

 produced before them, the sides being parallel ; the anterior 

 margin of the clypeus angular. The thorax elongate-ovate ; the 

 wings flavo-hyaline ; the tibias fuscous. Abdomen lanceolate, 

 with the apical segments more or less fuscous. 



97. Formica virescens. PI. III. figs. 24-27. B.M. 



Formica virescens, Fabr. Syst. Eat. 392. 9 ^ ; Spec. Ins. i. 490. 

 13; Mant. Ins. i. 308. IG; Ent. Syst. ii. 355. 23; and Cab. 

 Mus. Dom. Banks. 



Oliv. Encycl. Metk. vi. 494. 20. 

 Gmelin, Syst. Nat. Ins. ii. 2800. 32. 

 Formica longinoda, Latr. Hist. Nat. Fourm. 184 ^. 

 Lasius virescens, Fabr. Syst. Piez. 417. 8. 



Formica macra, Gue'r. Voy. Coq. Zool. ii. 202; Atlas, t. 8. f. 1, 

 la,lb^. 



This species we consider to be the African and Australian 

 representative of the F. smaragdma ; the species is rather smaller, 

 the female has shorter wings, the nervures blacker, and with a 

 fuscous stain along their course ; it also differs from F. smarug- 



