OF C Eli AM, CELEBES, TERNATE, AND GILOLO. 



37 



4. Formica circumspecta. F. rufo-picea, antennis pedibusque pal- 

 lide ferrugineis ; squamula subquadrata, supra emarginata (foemina). 

 F. pallide ferruginea, elongata et gracilis ; abdomine rufo-fusco {ope- 

 ra rid). 



Female. Length 6^ lines. Rufo-piceous, smooth and shining, the 

 anterior part of the head, its anterior margin, the scutellum and base 

 of the abdominal segments of a brighter colour ; the antennae, legs, 

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

 narrowed anteriorly, transverse behind, and slightly emarginate in the 

 middle ; the mandibles stout, punctured, and with a row of black 

 acute teeth on their inner margin ; the head slightly punctured in 

 front ; the scale of the peduncle subquadrate, slightly emarginate 

 above. 



Worker major. 3h lines' Of a pale ferruginous, with the posterior 

 portion of the abdomen fuscous ; head oblong, narrowed behind the 

 eyes ; thorax oblong, narrow, compressed behind ; the scale of the 

 peduncle small, narrow, with the superior margin rounded above ; the 

 thorax narrowed anteriorly, forming a sort of neck. 



The worker minor is 2 lines in length, more slender than the larger 

 worker, with the antennae and legs much more elongate, the head 

 narrowed behind, and the thorax prolonged into a sort of neck when 

 viewed sideways. 



Hab. Celebes (Tondano). 



5. Formica leucoph^ea. F. nigra, dense cinerea, pilosa; thorace 

 postice attenuato ; squama oblongo-ovata. 



Worker. Length 3 lines. Black and densely covered with a fine silky 

 cinereous pile ; antennae nearly as long as the body, slender, and 

 filiform, the flagellum scarcely thickened towards the apex; eyes 

 rather large and prominent, and situated high on the sides of the 

 head ; head oblong, narrowed behind the eyes. Thorax oblong, 

 narrowed and of equal width behind the prothorax ; legs very obscurely 

 reddish, with the apical joints of the tarsi rufo-testaceous. Abdomen 

 ovate, the apical margins of the segments testaceous ; the scale of the 

 peduncle narrow, small, and pointed above. 



Hab. Celebes (Tondano). 



6. Formica tropica. F. nigerrima, nitida, laevissima ; thorace pu- 

 bescente, postice compresso ; pedibus rufo-nigris. 



Worker. Length 3^ lines. Jet black, smooth, shining, and having a 

 faint prismatic lustre, particularly on the head, which is oblong, or 

 subquadrate ; the tips of the mandibles ferruginous. The prothorax 

 rounded at the sides and in front ; a deep constriction at the base of 

 the metathorax, which is elevated and rounded above ; the thorax has 

 a loose long pale scanty pubescence, probably much more dense in 

 specimens in fine condition ; the legs very obscurely ferruginous, 

 nearly black ; the legs, particularly the tibiae, have a thin long loose 



