1886.] A. Forel — Indian Ants of the Indian Museum, Calcutta. 241 



ttcus, which I have also described (1. c). It is possible, however, that 

 the true G. variegatus, Smith (Cat. Brit. Mus. p. 18), is more closely 

 allied to (7. sexguttatus, subsp. exignoguttatus. 



Genus Polyrhachis. 



6. P. BiHAMATA, Drury (111. Nat. Hist. t. 2, pi. 38, 1770), $ . Tavoy. 



6. P. ARMATA, Le Guillou (Ann. Soc. ent. Fr. T. X. 1841) (= Folyrh. 

 defensus^ Smith, Cat. Brit. Mus. p. 62 ; = Folyrh. pandarus, Sm., 1. c. p. 65), 



5 and 2. Sibsagar (Assam). 



Var. minor n. Length : only 7 millims. Abdomen bright rufo- 

 ferruginous ; legs brown ; thorax and antennae dark brown. In other 

 respects like the typical form. Sibsagar. 



7. P. SPiNiGERA, Mayr (Verb. k. k. zool.-bot. Ges. Wien, 4 Dec. 

 1878), Sibsagar. 



8. P. DIVES, Smith (Cat. Brit. Mus. p. 60) ( = acantha, Sm., Proc. 

 L. S. Z. V. 1860, p. 98, sec. Mayr), $. Sibsagar. The sole $ is a variety 

 with the abdomen brown, the pubescence coarser and a little more fasci- 

 culate, the abdomen having coarser and more abundant raised wrinkles 

 than the typical form. The pronotum a little broader anteriorly. 



9. P. ACASTA, Smith (Proc. L. L. S. 1860, V. 100)? (per- 

 haps = argentea, Mayr, Verh. zool.-bot. Ges. Wien 1862), $ . The silvery 

 pubescence is not dense. The spines of the metanotum are straight, 

 divergent, twice as distant at the base as in P. dives, as long as the 

 distance between their bases. Basal surface of the metanotum much 

 broader than long (in P. dives longer than broad) . Abdomen of the 

 Sibsagar specimen brownish, legs reddish yellow with the coxae, tarsi, and 

 the base of the tibiae blackish-brown. Length 5. 5 millims. Sibsagar. 



10. P. FURCATA, Smith (Cat. Brit. Mus. p. 64), ?. Variety with the 

 abdomen black (rufo-testaceous in Smith's type). A very distinct, 

 curious species, with the head and abdomen wholly smooth and shining, 

 the thorax and petiole very coarsely, unevenly, and deeply reticulate 

 (reticulate-punctate), the scale cylindric, much raised, bearing two long 

 spines curved like chamois horns. 



Smith's description is to be completed as follows : — 

 Thorax deeply emarginate between the mesonotum and the meta- 

 notam. Pronotum and mesonotum together strongly arched longitudi- 

 nally and transversely. Basal surface of the metanotum very short. 

 Clypeus carinate. Mandibles smooth and shining with scattered punc- 

 ture. The whole body more or less covered with long, yellowish- white 

 erect hairs and with a very scattered coarse pubescence. Tibiae and 

 scapi with long and perpendicularly erect hairs. Length 5. 5 — 6 mil- 

 lims. Sibsagar (Makes a nest in trees and is said to stridulate, but I 



