876 CALIFORNIA ACADEMY OF SCIENCES, 



bonariuni Smith, from which, however, it may be readily 

 distinguished by the stronger meso-metanotal constriction 

 and the more elevated posterior portion of the metanotum, 

 the declivity of which forms nearly a sharp angle with the 

 dorsal face of the segment, and in the more slender and 

 longer pedicel of the first node. 



This race is quite common on the West Indian islands 

 and the Central American republics. 



26. Cremastogaster sumichrasti Mayr, var. 



Cremaatogaster sumichrasti Mayr, Verb. zool. bot. Ges., Wien, xx, 

 1870, pp. 990 and 993. 



Many specimens. Ixtquintla, Tepic. 



Very similar in appearance and coloration to C?'. mis- 

 souriensis Emery, but differing from it in the shorter ter- 

 minal joint of the antennas, the not emarginate posterior 

 edge of the first node, the more transverse second node 

 and the much longer and finer hairs of the head, thorax 

 and abdomen. 



27. Cremastogaster opaca Mayr. 



Cremastogaster opaca Mayr, Verb. zool. bot. Ges., Wien, xx, 1870,' 

 pp. 989 and 992. 



Twenty-one specimens. Tepic. 



28. Cremastogaster sculpturata n. sp. 

 Worker: Length, 2.2-2.4 inni- Head polished, finely 



and sparsely striated above and below; granulated at in- 

 ner side of eyes. Antennal foveae finely reticulated, 

 Clypeus with a flattened, smooth and polished median 

 area which is bordered each side by a slightly elevated 

 and posteriorly diverging carina ; its lateral pieces sparsely 

 striated. Mandibles polished, faintly striated and sparsely 

 punctured. Club of antenna two-jointed, 



Pronotum with a few coarse and somewhat irregular 

 carinas. Mesonotum slightly elevated in front, sparsely 



