726 Bulletin American Museum of Natural History. [\'ol. XXIII, 



tened, with a faint median furrow anteriorly and a pair of broader ]\Iayrian fvirrows. 

 Scutellum with very broadly and faintly excised posterior border seimrating a pair 

 of broad, acute teeth. Epinotum with the base convex and only about half as long 

 as the abrupt concave declivity; spines similar to those of the worker but somewhat 

 stouter. 



Sculpture and pilosity as in the worker. 



Color a little darker in old specimens. Wings opacjue, infuscated; the mem- 

 branes and veins in the anterobasal portion of both fore and hind wings fulvous. 



Male. Length: 2.4-2.6 mm. 



Head, without the mandibles and eyes, narrow, longer than broad, with straight 

 posterior border. Mandibles like those of the worker but less distinctly denticulate. 

 Frontal carinse with large, reflected lobes and strong, diverging posterior ridges 

 reaching to the posterior corners where each terminates in a compressed, projecting 

 tooth. Postorbital carinse absent. Antennae slender, scapes enlarged towards 

 their tips which surpass the posterior corners of the head by about J of their length. 

 Pronotum with indistinct inferior, but prominent and acute superior teeth. Meso- 

 notum with distinct Mayrian furrows. Scutellum like that of the female, but with 

 more deeply excised posterior border. Petiole and postpetiole like those of the 

 worker and female. Gaster elliptical, convex above. Legs long and slender. Hind 

 femora not angularly dilated below. 



Opaque; very finely and densely punctate; gaster faintly shining or glossy. 



Pilosity very similar to that of the worker and female. 



Ferruginous; upper surface of head and the thoracic depressions blackish; 

 basal segment of gaster dark brown above. Mandibles, antennse, legs and tip of 

 gaster yellowish. Wings like those of the female. 



Texas: Austin, Belton, Langtiy, Fort Davis (Wheeler). 



California: Three Rivers (Culbertson). 



The types from which the worker and dealated female were carefully 

 described by Forel, are from x\ustin. The species is allied to the South 

 American C. strigatus Mayr and C. aurifus INIayr but differs from both in 

 having larger frontal lobes and in lacking prominent ridges on the middle 

 of the first gastric segment. The ear-like posterior corners of the head are 

 much shorter than in auritus and the scapes are shorter than in strigatus. 



22. Cyphomyrmex flavidus Pergande. 



Cyphomyrmex flavidus Pergande, Proc. Calif. Acad. Sci. (2), V, Dec. 1895, p. 895, ^ . 

 Cyphomyrmex flavidus Forel, Biol. Centr.-Am., Hymen., Ill, 1899-1900, p. 41. 



Worker. Length: 2.2-2.8 mm. 



Head, without the mandibles, longer than broad, broader behind than in front, 

 with obtusely excised posterior border and prominent posterior corners. Eyes con- 

 vex, at the middle of the head. Mandibles small and acute, with oblique, apparently 

 5-toothed blades. Clypeus long and rather flat, with a minute median excision in 

 its thin anterior border. Frontal area triangular. Lobes of frontal carinse very 



