204 



of the legs and thorax and the sting directed forwarJ. They sting 

 severely. 



28. Pseudomyrma gracilis Fab , var. mexicana Emeiy. 

 Cuernavaca, Dec. 29. Found ranning with great rapidity over Ihe 



bark of ihe acacias and guavas and living with their la'^vae an-i pupae 

 in dead branches or in the Tillandsias. In both kinds of nesis the lar- 

 vae of a Microdon were found. 



29. Iridomyrmex dispertitus Forel, var. nigellus Emery. 

 Cuernavaca, Dec. 25. A few spécimens found running about under 



stones and dead leàves in the coffee plantation. 



30. Dorymyrmex pyramicus Roger. 



Common at Cuernavaca, Quereiaro and Aguas Calientes. This spe- 

 cies lias no défi ni te association with Pogonomyrmex as claimed by 

 Me Cook. 



31. Forelius Me Cooki Forel. 



Common at Aguas Calientes, exhibiting the same habits as in Texas. 

 There is no défi ne association between this species and the agricul- 

 tural ants as maintained by McCook. 



32. Camponotus maculatus, subsp. picipes Oliv., var. pilo- 

 sula Forel. 



A single small nest found under a stone on a dry hill-slope near 

 Queretaro. 



33. Camponotus maculatus, subs. simillimus Sm., var. 

 flavopubens Forel. 



Cuernavaca, Dec. 26. Rare. Only two nests found under stones on 

 the side of a harranca. One of thèse was an incipient colony con- 

 sisting of a deàlated queen with five or six diminutive workers; the 

 other was a vigorous nest containing many w-Tkers and soldiers. 

 This ant in life has the peculiar opaque bluish bloom so characte- 

 ristic of sève rai of the Cuernavaca ants {Cy'phomiirmex rimosus and 

 Leptogenys Wheeleri, for example). 



34. Camponotus fragilis Pergande. 



A few workers found running on the trunk of an acacia tree at 

 Cuernavaca. 



35. Camponotus rubrithorax Forel. 



Cuernavaca, Dec. 25-27. On the moderately dry sides of the bar- 

 rancas, under stones. The ants hâve a peculiar boundiog movement 

 when excited. They attack one with vigor, dischargiog their formic 

 acid sécrétions very freely. There is only a single queen to a nest. 



