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bulletin: museum of comparative zoology. 



differently formed. In Arctomyrmex the penultimate antennal joint 

 is smaller proportionally even than in Adelomyrmex and the club has 

 the appearance of being one-jointed. 



Genotype. — Adelomyrmex (Arctomyrmex) hirsulus, sp. nov. 



42. Adelomyrmex (Arctomyrmex) hirsutus, sp. nov. Fig. 21. 



Worker. Length 1.75 mm. 



Head a little longer than broad, sides nearly straight, posterior corners 

 broadly rounded, occipital border shallowly and narrowly concave at middle. 

 Basal edge of mandibles with a triangular tooth a little in front of middle, 

 blades with four small, separated teeth. Anterior border of clypeus bluntly 



Fig. 21. — Adelomyrmex (Arctomyrmex) hirsutus Mann. 

 b. Lateral view of thorax and petiole. 



Worker, a. Front view of head. 



4-dentate. Antennal scapes extending less than two thirds the distance to 

 occipital corners; first funicular joint longer than the three succeeding joints 

 together, remaining joints, except the terminal strongly transverse, terminal 

 joint very large, as long as the seven preceding joints together. Eyes flat, 

 situated in front of middle of sides of head. Thorax moderately convex in 

 profile. Mesoepinotal suture strongly impressed at sides, feebly at middle. 

 Epinotum flat, roundly margined at sides and armed with a pair of short, 

 triangular spines; inferior angles produced and rounded. Petiole very shortly 

 pedunculate; node from above transversely oval, less than twice as broad as 



