1903.] NATURAL SCIENCES OF PHILADELPHIA. 229 



"The female resembles somewhat that of L. yankee, which, however, 

 is somewhat smaller, the last antennal joint and metanotal spines 

 shorter, the hairs of the abdomen much finer and the erect hairs of 

 the femora wanting. 



"Worker. — Length about 3 mm. 



"Head and teeth of mandibles black, the abdomen dark-brown; an- 

 tennae, mandibles, thorax, legs and nodes reddish-yellow; coloration 

 of the last three or four joints of the antennae and the femora as in 

 the female, the upper surface of the thorax and nodes more or less 

 decidedly reddish-brown, Striation of the head more distinct than 

 in the female, and the space between the striae more or less distinctly 

 reticulated, particularly so toward the sides. Pronotum and mesono- 

 tum and the nodes finely rugose; sculpturing of the metanotum 

 slightly coarser. Abdomen smooth; all the hairs similar to those of 

 the female. 



"The worker is very similar in appearance to those of L. yankee, 

 though somewhat larger, more robust, the sculpturing coarser and the 

 hairs stouter." 



Type locality: Metlakahtla, Alaska (June). Cat. No. 5,278 U. S. 

 National Museimi. 



Described from one female and twelve workers. 



4. Leptothorax Provancheri Emery. 



Myrmica tuberum Provancher, Natur. Canad., V, 12, 1881, p. 3592. Faune 



Entom. Canad., Hymenopt., 1883, p. 602. ? . 

 Leptothorax Provancheri Emery, Zool. Jahrb. Abth. f. Syst., VIII, 1894, 



pp. 317 and 320. ? . 



Worker. — Length 2.75 mm. 



Body robust. Antennae U-jointed. Thorax stout, impressed at 

 the mesoepinotal suture. Epinotal spines short, tooth-like, resem- 

 bling those of L. canadensis var. yankee. Petiole with subparallel 

 sides, node angulate above. Postpetiole about half again as^ broad 

 as the petiole, transversely elliptical. 



Opaque, rugose-punctate; sculpturing like that of acervorum, the 

 rugae on the head less numerous, forming wide meshes. Postpetiole 

 very smooth and shining, with a few piligerous punctures, but other- 

 wise impunctate. Gaster smooth and shining, with short longitudi- 

 nal striae at its extreme base. 



Hairs rather long, clavate, both on the body and on the tibiae. 



Testaceous, crown of head infuscated. 



Type locality: "Canada" (Provancher). 



Redescribed by Emery from a single specimen, Provancher's orig- 

 inal description being inadequate for the identification of the species. 



