SyO CALIFORNIA ACADEMY OF SCIENCES. 



proportionately shorter and its sides more strongly arcu- 

 ated, while the coloration is more uniformly brownish- 

 yellow. 



Twenty-two specimens. Santiago Ixtquintla. 



This species resembles very much Azteka angusticeps, 

 differing from it, however, in the larger size, the sparser 

 erect hairs and the absence of such hairs on the antenna 

 and legs. 



11. Tapinoma melanocephalum (Fab.) Mayr. 



Formica melanocephala Fabriciiis, Entom. Syst., ii, 1793, p. 353. 

 Lasius melanocephalus Fabricitis, Syst. Piez., 1804, p. 417. 

 Myrmica melanocephcda Lepeletier, Hist. nat. Ins. Hym., i, 1836, p, 



185. 

 Formica nana Jerdon, Madras Journ. of Litt. & Sc, xvii, 1851, ja. 



125. 

 Myrmica pellucida Smith, Journ. Proc. Linn. Soc. Zool., ii, 1857, 



p. 71. 

 Myrmica ( Monomorium) pellucida Smith, Cat. Hym. Ins. Brit. Mus., 



vi, 1858, p. 124. 

 Formica familiaris Smith, Journ. Proc. Linn. Soc, Zool., iv, 1860, 



Suppl. p. 96. 

 Tapinoma melanocephalti7n Mayr., Verh. zool. bot. Ges. Wien, xii, 



1862. p. 651. 

 Micromyrma melanocephala Roger, Berlin entom. Zeitschr., vi, 



186-2, p. 258. 



One specimen. San Bias. 



This species is quite common on all of the West Indian 

 islands and has also been found in a hothouse of the bo- 

 tanical garden at Washington, D. C. 



12. Dorymyrmex pyramicus Rog. var. flavus Mc- 

 Cook. 



Dorymyrmex flavus McCook, Comstock, Hep. Cotton-worm, 1879, 



p. 188. 

 Dorymyrmex jyyramicus var. flavus Mayr, Verh. zool. bot. Ges. 



Wien, xxxvi, 1886, p. 433. 



Three specimens. San Jose del Cabo and Sierra San 

 Lazaro, Cape Region, Lower California. 



