FORMICID^ FROM LOWER CALIFORNIA. 27 



median and posterior femora. A few shorter and stiffer 

 hairs may also be observed at the apex of the femora. 

 Appressed pubescence minute, intermixed on the scape 

 with fine, erect hairs. Head about one-third broader 

 than the thorax, broadest at posterior angles and gently 

 decreasing in width towards the mandibles, emarginate 

 behind, with the posterior angles rounded. Clypeus trun- 

 cate in front, its median carina distinct. Surface of head 

 and thorax densely and finely granulated and sparsely 

 punctured. Abdomen with a still finer sculpture and 

 somewhat transversely striated. Mandibles smooth, with 

 scattered piliferous punctures; their apical edge with six 

 black teeth. Antennae slender, the scape reaching a 

 little beyond the posterior angles of the head. Scale 

 ovoid, broadest beyond the middle, stoutest at base, 

 slightly arcuate in front, almost straight behind. Legs 

 long and slender. 



9 minor: Length, 5—7 mm. General color somewhat 

 paler than in the ^ major, the head and thorax without 

 darker shadings, the abdomen either faintly brownish 

 or only the sutures somewhat darker. Median and pos- 

 terior femora almost white. Head about twice as long 

 as broad, scarcely broader than the thorax ; its sides 

 parallel, rounded beyond the eyes. Antennae longer and 

 more slender, the scape reaching nearly to the meso- 

 thorax. 



It is a very delicate looking species. 



The minor resembles very much that of Camp, 

 ■melleus Say, though it is smaller, more delicate, with 

 the head not emarginate. Camp, melleus differs from it 

 also in the absence of erect hairs on the scape and in the 

 stouter scale. 



This species resembles also somewhat Camp, atlantis 

 Forel, differing from it however in the form of the cly- 



