205 



36. Camponotus rectangularis Emery, var. rubroniger 

 Forel. 



Cuernavaca, Dec. 27. Arboreal, Desling in the dead liinbs of trees 

 and also in ihe Tillandsias on the acacia^ and gaavas, often in para- 

 biosis wilh Crytocerus and Q^emastogaster. 



37. Camponotus abdominalis Smith, var. 



Cuernavaca^ Dec. 25-27. Very common, nesting in three différent 

 places : under slones on moisi liill-slopes^ iji dead tree trunks and, 

 most frequenily, in the Tillandsias, often in parabiosis wi.h other 

 Formicidae When their nests are distarbed tliey rush out and attack 

 the intruder with great fury. 



38. Camponotus mina Forel. 



Cuernavaca, Dec. 26. Several workers found on tall umbelliferous 

 plants where Ihey were attending some remarkable Membracidae 

 much as our northern species of Formica attend the Aphidae. 



39. Myrmecocystus melliger Forel, var. depilis Forel. 



A few small mound-shaped nests of this species were observed in 

 the cactus-covered désert near Pacheco in Zacatecas, Dec. 21. Only 

 small workers were seen about the large openings of the nests. 



40. Brachymyrmex musculus Forel. 



Cuernavaca, Dec. 25. Very common under stones on the moist 

 hill-slopes. Its habits, so far as Ihey could be observed, are very 

 similar to those oîB. Reeri in similar situations on the hill-slopes of 

 New-England. 



41. Prenolepis longicornis Latreille. 



Cuernavaca, Dec. 25-27. Common under stones in the coffee plaa- 

 tations and in the patio of Dr. Eugène Le Baron's sanitarium. 



