868 CALIFORNIA ACADEMY OF SCIENCES. 



sonotum is somewhat elevated above the pro- and meta- 

 notum, convex above, compressed at the sides, and much 

 narrower than the prothorax; the metanotum broadens 

 posteriorly; the declivity is quite abrupt and shorter than 

 the basal section. The scale is wedge-shaped, broadest 

 above, the apex acute and arcuate. Abdomen small, 

 broadly oval. Legs stout. 



Body polished; mandibles finely and densely striated 

 and sparsely punctured; head, thorax and abdomen finely 

 and densely punctured. 



Erect hairs quite dense, including legs and antennse. 

 Appressed pubescence yellowish, minute and rather 

 dense. 



Color of the head, antennae, mandibles and sometimes 

 the entire legs, reddish-yellow; sometimes the entire face 

 or only a spot between the frontal carina, the upper mar- 

 gin of the vertex and the thorax brownish; the legs, ex- 

 cept tarsi, brown or blackish ; the abdomen paler than 

 the head, with pale brownish bands. Teeth of mandibles 

 and the eyes black. 



Small worker: Length, 2.4 mm. The head is propor- 

 tionall}' smaller and the occiput less strongly emarginated 

 than in the large worker. It is almost uniformly brown, 

 except the face each side of the frontal carina, the man- 

 dibles and scape, which are reddish, and the tarsi yellow- 

 ish, while the whole surface is more highly polished. 



Numerous specimens. Santiago Ixtquintla. 



The discovery of the sexes may prove this to be a dis- 

 tinct species. 



10. AZTEKA EISENI n. Sp. 



Large worker: Length, 4.8-5 mm. Head longer than 

 broad, the sides parallel and slightly arcuated, the occi- 

 put deeply emarginated; vertex with a short, impressed, 

 median line. Clypeus of the usual shape and slightly ar- 



