884 CALIFORNIA ACADEMY OF SCIENCES. 



transverse depression, its posterior section with a small 

 blunt tubercle each side anteriorly; meso-metanotal con- 

 striction deep and narrow, the metanotum with a deep 

 channel along the middle, the lateral margins of the chan- 

 nel quite sharp; spines stout, acute and about one-fourth 

 the length of the basal section. First node as usual; the 

 second node transversely oval and with two longitudinal 

 impressed lines. 



Head reticulate -striate and densely and finely granu- 

 lated; area between the frontal carina not granulated, 

 the stri^ diverging posteriorly; median area of the cly- 

 peus polished, and with coarse striae along the anterior 

 margin. Mandibles polished, sparsely and quite coarsely 

 punctured. Pronotum transversely striated and indis- 

 tinctly granulated, and with hair -bearing points. Me- 

 sonotum densely but rather indistinctly granulated, the 

 anterior section with a few hair-bearing points; the entire 

 metathorax as well as the sides of the other two segments 

 densely granulated. Abdomen polished and very fine 

 and densely shagreened and with hair -bearing points. 

 Erect hairs rather long, fine and quite dense, those of the 

 scape and legs somewhat shorter, appressed pubescence 

 most dense on the head and abdomen. 



Color yellowish-red or brownish-red, the head and ab- 

 domen frequently darker in the larger specimens. 



Worker: Length, 2.6 mm. Head longer than broad^ 

 the sides gently arcuate. Clypeus convex, the anterior 

 margin but slightly arcuated and slightly notched at the 

 middle, with a slender median carina and a shorter one 

 each side of it. Antenna? slender, the scape reaching 

 beyond the occiput; joints two to eight of the flagellum 

 longer than broad. Mandibles of the usual shape, with 

 two long, acute teeth at the apex and a number of minute 

 teeth behind them. Pronotum without projecting lateral 



