144 SMITH ON HYMENOPTEEA OF AEU ISLANDS. 



longitudinally but very delicately striated, their inner margin eden- 

 tate ; the thorax slightly narrowed behind. Abdomen very delicately 

 aciculate. 



Male. Length 3| lines. Of the same colour, and sculptured like the 

 worker; the head rounded behind the eyes and narrowed before 

 them J the eyes very large, prominent and ovate j the ocelli very 

 bright and prominent; antennae elongate and slender, the scape 

 short, not longer than the second joint of the flagellum. Thorax : 

 the scutellum prominent, forming a rounded tubercle, the metathorax 

 elongate and oblique. Abdomen aciculate as in the worker, but 

 much more deeply strangulated between the first and second seg- 

 ments ; the petiole rugose and clavate. 



Hah. Aru. 



Gen. Odontomachus, Latr. 



1. Odontomachus simillimus. Smith, Cat. Form. p. 80. 11 $• 

 Hah. Aru. Ceylon. 



2. Odontomachus tyrannicus. 0. capite thoraceque nigris, an- 

 tennis abdomineque ferrugineis, margine interno mandibulorum 

 serratulo. 



Worker. Length 7 lines. Head oblong, narrowed behind, posteriorly 

 deeply emarginate; the mandibles rufo-piceous, brightest at their 

 apex, which is armed with two long teeth which are bent abruptly 

 inwards, their tips black ; the anterior portion of the head striated 

 obliquely from the centre ; the head, behind the anterior sulcation, 

 very smooth and shining and having a deep longitudinal central 

 depression. Thorax transversely striated, the articulations of the 

 legs and the tarsi ferruginous. Abdomen smooth, shining, and fer- 

 ruginous ; the node of the petiole incrassate, cylindric, and tapering 

 upwards into a very acute spine. 



Hah. Aru. 



3. Odontomachus MALIGNUS. O. ferrugineus ; capite supra oblique 

 striato ; margine interno mandibulorum confertim serrato ; metatho- 

 race transversim striato ; squama unispinosa ; abdomine lajvissimo. 



Worker. Length 7 lines. Ferruginous ; the flagellum and legs palest ; 

 head much narrowed behind, the posterior margin deeply emarginate j 

 mandibles smooth and shining, their inner margin strongly serrated, 

 their apex abruptly bent or elbowed, and armed with two stout teeth ; 

 the face anteriorly evenly striated obliquely ; the head behind the 

 anterior sulcation very delicately striated obliquely. The prothorax 

 smooth and shining, the meso- and metathorax transversely striated. 

 Abdomen very smooth and shiDing; the node of the petiole incrassate 

 and tapering upwards into an acute spine. 



Hah. Aru. 

 This species most closely resembles 0, maxillaris from Brazil ; but its 



