MANN: ANTS OF THE BRITISH SOLOMON ISLANDS. 363 



89a. Iridomyrmex anceps Roger, subsp. papuanus Emery. 

 Ann. Mus. civ. stor. nat. Geneva, 1897, 38, p. 572, ^ . 



New Georgia. Rubiana Lagoon. 

 Three workers agree closely with Emery's description. 

 Two additional species of Iridomyrmex among my material are 

 represented only by worker minors. 



90. Iridomyrmex rufoniger (Lowne) var.? 

 Formica rufonigra Lowne, Ent., 1865, 2, p. 279. 



Malaita: Auki. 



Several workers were found on trunks of trees near the beach. 



91. Iridomyrmex dimorphus Viehmeyer. 



Abh. berichte K. zool. anthr.-ethn. mus. Dresden, 1912, 14, no. 1, p. 7, pi. 1, 

 fig. 7, 7a, 7b, ^ . 



Worker. Length 4-6 mm. 



Head a little longer than broad, moderately narrowed in front, posterior 

 corners narrowly rounded, border deeply concave. Mandibles stout, with a 

 larger blunt apical tooth and four to eight smaller teeth. Clypeus slightly 

 convex, anterior border straight. Frontal carinae very short. Antenna! 

 scapes barely attaining occipital corners; first funicular joint a little longer 

 than the second; second joint one and two thirds as long as third, remaining 

 joints gradually increasing in thickness. Eyes large, not very convex, situ- 

 ated in front of sides anterior to middle. Pronotum broader than long, evenly 

 rounded above and at sides. Mesonotum elongate oval, twice as long as broad. 

 Mesoepinotal suture broadly impressed, with prominently tuberculate spir- 

 acles. Base of epinotum rounded, twice as long as broad; a little longer than 

 the declivity into which it broadly rounds. Petiolar node thick, in profile 

 triangular above, sides narrow. Legs very long and slender. 



Shining. Mandibles rugulose. Finely punctate and covered with prui- 

 nose pubescence, which is most dense on gaster and thoracic pleurae. Rather 

 stiff erect hairs scattered on head, body, and appendages. 



Black. Mandibles and funiculus brown. 



Malaita: Interior near Gwountafu. Ysabel: Fulakora. 



