COLLECTED IN BORNEO, ETC. 53 



possibly supposed any relationship to have existed between the 

 female and the other sex. 



It is to the FormicidcG that Mr. Wallace has made the most 

 valuable additions : the number of new species added to the genus 

 Polyrhachis is very important, and that of eight to the Cryptoceridce 

 makes a grand addition to that curious and highly interesting 

 family. The new genus, EcMnopla, being founded on the exami- 

 nation of workers only, will no doubt hereafter require a revision 

 of the characters laid down, but in describing a collection contain- 

 ing so many novelties such occurrences are almost inevitable. 



1. Formica gigas, Latr. Hist. Nat. Fonrm. 105. pi. 2. f. 6 $. 

 Hab. Borneo, Malacca, Singapore. 



2. Formica compressa, Fabr. Syst. Piez. p. 396. 

 Hab. Sarawak. 



Specimens from Borneo have the legs more or less red, and in some 

 examples the vertex is more or less so. 



3. Formica stricta, Jerdon, Madr. Journ. Lit. ty Sci. (1851) p. 123. 

 Hab. Borneo (Sarawak). 



4. Formica smaragdina, Fabr. Spec. Ins. 488 ? . 



Formica longipes, Jerdon, Madr. Journ. Nat. Hist. 2nd ser. xiii. 104 § . 



Formica viridis, Kirby, Trans. Linn. Soc. xii. 477 ? • 



Hab. Borneo (Sarawak), Malacca, Sumatra, Celebes, Philippine Islands. 



5. Formica festina. F. nigra, nitida; flagello fulvo ; thorace snbtns, 

 metathorace pedibusque et petiolo pallide ferrugineis ; abdomine sub- 

 tns piceo. 



Female. Length 9-10 lines. Black and shining: head oblong-quadrate; 

 the mandibles and anterior margin of the face rufo-piceous ; the 

 flagellum fulvous. Thorax : beneath, the sides, the metathorax and 

 the legs, pale ferruginous ; wings subhyaline, their nervures ferru- 

 ginous; scale of the abdomen pale ferruginous, ovate and slightly 

 emarginate above ; the posterior margins of the segments of the 

 abdomen, above, pale rufo-tcstaceous ; beneath, entirely pale. 



Hab. Borneo (Sarawak). 



This species closely resembles the European species F. ligniperda — in 

 "act appears to be the exotic form of that insect. 



6. Formica mistura. F. nigro-picea, ferrugineo variegata, pubescens; 

 capite opaco, thorace abdomineque nitidis. 



Female. Length 7 lines. Head black, the vertex and cheeks more or 

 less ferruginous ; the head opake, with the mandibles shining nigro- 

 piceous ; the scape attenuated, rufo-testaceous ; the clypeus delicately 

 punctured, slightly emarginate in front. Thorax elongate-ovate, 



