1906.] Wheeler, The Ants of Japan 327 



shows that the only important character is the maculation of the 

 gaster in the females and workers, and large series of specimens will 

 undoubtedly show that this character is highly variable. Similar 

 conditions are seen in the American C. landoUi and in C. quadrimacu- 

 latus of Madagascar. Both of these species show all gradations 

 between a beautiful development of gastric spots and their complete 

 absence. A somewhat similar condition is seen also in the American 

 C. ruficeps. 



49. Camponotus marginatus brunni Forel. 

 FoREL, Mittheil. naturhist. Mus. Hamburg, XVIII, 1901, p. 70, ^ 



Forel based this subspecies on the worker minor obtained from 

 Hozuyama. It resembles the variety quadrinotatus but lacks the 

 white spots on the gaster and has a blunt petiole. 



50. Camponotus (Colobopsis) rothneyi Forel. 



Camponotus {Colobopsis) rothneyi Forel, Journ. Bombay Nat. Hist. Soc, 

 VII, 1893- P- 43.S, 9 



Colobopsis rothneyi Bingham, Fauna. Brit. India, Hymenopt., II, 1903, 

 P- 346. 



A single soldier and dealated female, agreeing very closely with 

 Porel's description of this species, were taken by Mr. Hans Sauter at 

 Okayama. There are no pale spots on the gaster as in the European 

 C. truncains, of which it may be merely a subspecies. Forel has 

 ■described from Singapore a form which he calls C. rothneyi r. krafti. 



51. Polyrhachis lamellidens F. Smith. 



F. Smith, Trans. Ent. Soc. London, 1874, pp. 403, 404, $ 



Mayr, Verhandl. zool. bot. Ges. Wien, 1878, p. 652, $ 



FoREL, Bull. Soc. Ent. Suisse, X, 7, 1900, p. 270. 



Forel, Mittheil. naturhist. Mus. Hamburg, XVIII, 1901, p. 78. 



Bingham, Fauna Brit. India, Hymenopt., II, 1903, p. 403, fig. 139, ^ 



Worker. (Plate XLI, Fig. 2.) Length 6-6.5 mm. 



Mandibles with 4 subequal teeth. Clypeus convex, anteriorly subcarinate. 

 Head convex above, excluding the mandibles about as broad as long, with 

 rounded sides and occipital border. Thorax with steep, flattened, lateral and 

 concave dorsal surfaces, meeting on each side in a prominent ridge, which is 

 sharplj' interrupted at the pronounced promesonotal and mesoepinotal sutures. 

 Pronotum about as broad as long, its lateral ridge continued anteriorly on 

 each side into a long spine, which is directed outward and forward and curved 

 ■downward at its tip. Mescnotum broader than long, bearing at the middle of 



