34 CALIFORNIA ACADEMY OF SCIENCES. 



14. Aph^nogaster sonor^ n. sp. 



Q. Length, 7-9 mm. Reddish-brown; declivity of 

 metathorax, inner face of its thorns and more or less of 

 base of first abdominal segment reddish. Eyes blackish- 

 brown. The whole insect is highly polished and rather 

 sparsely beset with medium sized, erect, pale and glisten- 

 ing, stiff hairs, which are densest on the head and ventral 

 side of the abdomen, longest and finer on the under side 

 of the head, the coxai and ventral side of abdomen; those 

 on under side of head are longest and gently curved for- 

 ward, similar to those of Pogonomyrmex . Pubescence 

 of antennae shortest and somewhat appressed. 



Head almost twice as long as broad, slightl}^ broadest 

 at insertion of mandibles, gently rounded beyond the 

 eyes, with the posterior emargination almost semicircular, 

 and about as broad as the prothorax. Its surface is 

 densely and finely striated, the striae extending but little 

 beyond the eyes, except those along the middle of the 

 face, which extend a little farther back, their ends curv- 

 ing inward and becoming confluent. Spaces between 

 the stria* dense but finely granulated. Lower portions of 

 cheeks and the vertex beyond the stride polished and 

 faintly shragreened. Clypeus broadly triangular, slightly 

 arcuate in front; the spaces between the stria^ smooth. 

 Frontal area small, triangular, smooth or faintly granu- 

 lated posteriorly. Mandibles large, densely striated, with 

 a few coarse, scattered punctures; their apical edge pro- 

 vided with two large teeth at the apex and two or three 

 rudimentary teeth along the edge. Antenna long and 

 slender, the scape reaching beyond the posterior margin 

 of the head ; the first joint of the flagellum is about five 

 times as long as wide, the others gradually decreasing in 

 length, the last somewhat longer than the penultimate 

 ioint. 



