1(32 Mr. Smith's Descriptions 



Sp. 2. Ecilon vagans. 



Formica vagans, Oliv. Ency. Meth., vi. 501. 



Worker. — Length 4—5 lines. Entirely opaque, reddish brown ; 

 some individuals have the head and thorax blackish brown ; the 

 mandibles as in E. hamala ; the head has, on each side behind, a 

 short bent tooth, and a central impressed line running from the 

 insertion of the antennse and nearly extending to the vertex ; the 

 eyes larger than in E. liamata, the thorax of the same form as in 

 that species : the first node of the abdomen has a short acute spine 

 beneath, curving backwards, the second has also a minute spine 

 pointing forwards; the abdomen concolorous with the head and 

 thorax ; but sometimes fulvous. 



Worker (minor). — 3 lines. Has the head of a different form to 

 the larger worker, being oblong and rounded at the angles ; the 

 spines behind very small ; the mandibles small, curved, and very 

 broad at their apex, the inner edge very finely serrated ; the tho- 

 rax similarly formed to that of the larger worker ; the articulations 

 of the legs pale, the tarsi palest. Abdomen pale reddish yellow, 

 the nodes having sharp spines beneath, as in the large worker. 



This species appears to be equally abundant as the former, but 

 has been hitherto confounded with it. 



Sp. 3. Ec'ilon curv'identala. 



Formica curvidenlata, Latr. Hist. Nat. des Fourm., p. 269, 

 tab. 8, fig. 55. 



Worker. — 3^ lines. Reddish yellow ; the head paler than the 

 other parts ; the Hagellum fusco-ferruginous, the scape ferru- 

 ginous and inserted in a fossulet, the edges of which are raised in 

 front, and recurved round the base of each scapus ; the mandibles 

 dark brown ; short, stout and broadly expanded, the inner edge 

 finely denticulate : head wider than the thorax, narrowed behind, 

 the posterior angles having each a short bent spine. Thorax : an 

 obtuse tubercle on each side at the base of the metathorax ; the 

 first node of the abdomen having at its base beneath a small 

 tooth on each side ; the second node has a tooth at its base be- 

 neath, pointing forwards. Abdomen ovate, and pointed at the 

 apex : the entire insect thinly sprinkled with pale hairs. 



This is probably a smaller form of the worker, either of E. 

 hamuta or vagans : it appears to be equally abundant with both 

 those species. 



