FORMICID^ FROM LOWER CALIFORNIA. 3 1 



MYRMICID^. 



9. PSEUDOMYRMA Sp. 



One ^ . Calmalli mines. 



This may be but a variety of Pseudomyrma thoracica 

 Nort., though the specimen is only about half the size. 

 The principal difference appears to be its coloration. 

 Sufficient additional material would be needed to settle 

 the question of identity. 



10. AtTA VERSICOLOR n. sp. 



^ . Length, about 6 mm. Color reddish-brown. 

 Eyes and apical edge of mandibles, black. All de- 

 pressions and all prominences appear to be black in a 

 certain light, while the nodes and the abdomen, if viewed 

 from above or in certain directions from the side, have a 

 bright coppery reflection. 



Head wider than long, deep and angularly emarginate 

 behind; a rather broad, shallow frontal channel and 

 laterally carinated area beyond insertion of antennas. 

 Posterior angles of head rounded and with a row of six 

 or more short denticles, the last one somewhat longest; 

 three or more teeth may also be observed along the pos- 

 terior ventral edge each side, the anterior one of which 

 being longest. Frontal laminse broad, somewhat longer 

 than wide, bifid at upper angle; interno-ocular carina? 

 distinct, curved inwards. -Clypeus broadly triangular, 

 slightly arcuate in front, with a slight median emargina- 

 tion. Mandibles large, triangular, their apical edge al- 

 most straight and furnished with four to six blunt, rudi- 

 mentary teeth. Scape of antenna? rather short, reaching 

 but little beyond posterior angles of the head. Thorax 

 of the usual shape in this genus. 



Prothorax with two stout spines each side, the anterior 

 pair farthest apart, longest, inclining forward, the other 

 two stouter, directed backward and outward ; two short, 



