MANN: ANTS OF THE BRITISH SOLOMON ISLANDS. 303 



Key to the Species {Workers) from New Guinea and the Solomons. 



Mandibular blades at f distance from apex to base with an erect and acute 

 tooth; epinotum bidentate. Length 41-5 mm. (New Guinea). 



chirichmii Emery. 



Mandibular blades with acute teeth at the middle; epinotum angulate 

 or rounded 1. 



1. Petiolar node strongly transverse; in profile narrow and wedge shaped; 



seen from front rounded, truncate or concave above; epinotum angulate 



between base and declivity. Length 3.5-5 mm 2. 



Petiolar node in profile conical or subcorneal; epinotum rounded between 

 base and declivity. Length 6-7 mm 3. 



2. Basal gastric segment not coarsely punctate graeffei Mayr. 



Basal gastric segment coarsely punctate. 



punctiventris Mayr subsp. oceanicus Emery. 



3. Striation on front of head not dense; extending only slightly beyond ends 



of frontal carinae and confined between them; bicolored. (Santa Cruz : 



eastern Solomons) cato Forel subsp. isolatus Mann. 



Striation on front of head dense, covering most of the front, and extending 

 two tliirds the distance to occipital border and not confined between 

 frontal carinae 4. 



4. Ferruginous (New Britain and western Solomons) cato Forel. 



Mostly black (Solomons) cato Forel var. subfasciatus Mann. 



3L Odontomachus haematoda (Linne). 



Syst. nat., ed. 10, 1758, 1, p. 582, ^ . 



Santa Cruz: Graciosa Bay. San Cristoval: Parana, Wainoni Bay. 

 Three Sisters: Malapaina. Ugi: PaAva. Russell: Yandina. 

 Malaita: Auki, Simoli (Coll. H. Hall). Florida: Tulagi, Maliali. 

 Ysabel : Fulakora. 



As abundant in the Solomons as it is in all other tropical countries. 



32a. Odontomachus imperator Emery, subsp. emeryi, subsp. nov. 



Worker. Length 14.5-15.5 mm. 



Head, and gaster black, mesothorax dark brown; prothorax, epinotum, 

 petiole, mandibles, antennae, and legs yellowish brown, the tarsi darker than 

 the other parts. 



