464 



bulletin: museum of comparative zoology. 



a little longer than high, feebly convex above. Postpetiole about twice as 

 broad as petiole; transversely oval. 



Head, thorax, petiole, legs subopaque and densely punctate. Postpetiole 

 and gaster shining, the latter with coarse, short striae on first segment. Mandi- 

 bles moderately shining, finely punctate. 



Fine, short, erect hairs moderately abundant on body and shorter curved 

 hairs rather dense on head. 



Color testaceous. 



TaA-iuni: in mountains near lake. 



Described from a single worker found beneath a stone. 



Resembles S. biroi Emery, but differs in the shallowly concave 

 occipital border of the head which in biroi is narrowly and deeply 

 excised. 



52. Strumigenys nidifex, sp. nov. Fig. 23. 



Worker. Length (including mandibles) 3.5-5 mm. 



Head broad behind, posterior border deeply excised, vertex broadly and 

 strongly impressed transversely; front above eyes subgibbous; cheeks swollen 

 and rounded. Base and lateral lobes of clypeus convex, anterior middle 



portion depressed, border strongly concave 

 at middle. IMandibles a little more than 

 half as long as head at middle, their blades 

 of subequal thickness, slightly curved, with 

 three teeth apically, the inner of which is 

 as long as the other two and situated dor- 

 sally. Antennae slender, their scapes ex- 

 tending three fourths the distance to oc- 

 cipital corners; first funicular joint as long 

 as the second and third together, third joint 

 much shorter than the second; terminal 

 joint nearly as long as the three preceding 

 joints together. Scrobes broad and deeply 

 impressed in front of eyes, indistinct pos- 

 terior to them. Eyes rather large and con- 

 vex. Thorax elongate, humeri rounded. 

 Base of epinotimi about as long as declivity, 

 somewhat elevated, submargined at sides; 

 spines acute, and distinctly longer than 

 their distance apart at base. Petiole long and slender, its peduncle much 

 longer than the node; node longer than high, abrupt in front, nearly flat 

 above; from above, longer than broad rounded in front and at sides. Post- 

 petiole sHghtly broader than long and a little less than twice as broad as node. 



Fig. 23. — Strumigenys nidifex Mann 

 Worker. Front view of head. 



