COLLECTED AT BACKIAN, KAISAA, ETC. 



95 



slightly notched above. Abdomen wider than the head, subglobose ; 

 the apical margins of the segments narrowly pale testaceous. 

 Hab. Bachian. 



This species is found on trees, running in numbers up and down the 

 trunks, probably in search of Aphides. 



5. Formica cruda. F. pallide testacea, lajvis, nitida, sparse pilosa; 

 abdomine fusco. 



]Vorker. Length 2 lines. The head, thorax, scale of the peduncle, and 

 tlie legs pale testaceous yellow ; the mandibles and head anteriorly 

 sometimes of a slight ferruginous colour ; the abdomen fuscous or 

 fusco-testaceous, and covered with a fine thin short silky pubescence ; 

 the head heart-shaped ; the eyes black, round, and placed forwards 

 and inwards ; the mandibles stout and triangular, their inner margin 

 with a row of acute ferruginous teeth. Thorax much naiTower than 

 the head, strangulated at the base of the metathorax, which is oblique 

 behind. Abdomen wider than the thorax, but not so wide as the head. 

 Hab. Bachian. 



This insect varies in size, but the form and colouring is the same in all 

 the workers, the smallest of which is about one line long. " Found beneath 

 bark and about fern-roots." 



6. Formica lactaria. F. nigra; antennis pedibusque pallide fer- 

 rugineis. 



Worker. Length H line. Black; the head and abdomen smooth and 

 shining, the thorax rugose ; the antennae and legs rufo-testaceous, the 

 apical jbints of the tarsi palest; the maudibles pale ferruginous; the 

 head ovate. The thorax narrow, compressed behind, deeply strangu- 

 lated between the meso- and metathorax, the latter abruptly truncate 

 behind ; the abdomen ovate, the scale of the peduncle ovate. 

 Hub. Bachian. 



This species varies in colour ; some specimens are obscurely ferruginous, 

 having the appearance of immaturity. Mr. Wallace says of this insect, 

 "Found in numbers, milking Aphides on blades of grass." 



7. Formica incursor. F. nigra ; capite antice obscure ferrugineo ; 

 squama ovata. 



Worker. Length 2 lines. Black, smooth and shining ; the head sub- 

 ovate, narrowed anteriorly, the margin of the vertex rounded ; the eyes 

 rather large, ovate, and placed high on the sides of the head ; before 

 the insertion of the antenna; obscurely ferruginous ; the mandibles 

 and apical joints of the tarsi rufo-testaceous. The thorax narrowed 

 behind, with a deep strangulation between the meso- and metathorax. 

 Abdomen ovate and thinly sprinkled with pale glittering hairs ; the 

 scale of the pedimcle ovate, rounded above. 



Hab. Bachian. 



8. Formica rufifrons. F. nigra; capite oblongo, autice ferrugineo ; 

 antennis tarsisque rufo-ferrugineis. 



