A NEW GUEST-ANT AND OTHER NEW FORMICID^ 

 FROM BARRO COLORADO ISLAND, PANAMA. 1 



WILLIAM MORTON WHEELER. 



The researches of the past twenty-five years have shown that 

 the number of ants which regularly live in more or less intimate 

 symbiotic or parasitic relations with other ants is considerable, 

 and that the behavior exhibited under these conditions is re- 

 markably diverse. Until recently, however, such social parasites 

 were known only from north temperate and subtropical regions. 

 Several very interesting forms have now been discovered in the 

 tropics and even in the south temperate zone. The following is a 

 list of the workerless parasites (permanent social parasites) 

 resembling the European Aner gates atratiilus Schenck and the 

 North American Epcecns pergandei Emery that have been de- 

 scribed from paleotropical and neotropical localities: 



(1) Wheeleriella wroughtoni Forel (1910, 1911), described from 

 female and male specimens found living in the nests of Mono- 

 morium solomonis indicum Forel at Poona, India. 



(2) Parapheidole oculata Emery (1900, 1914-15), described 

 from a female specimen from Madagascar and supposed to be a 

 workerless parasite of some species of Pheidole. 



(3) Anergatides kohli Wasmann (1915). Males and females 

 taken in nests of Pheidole megacephala melancholica Santschi in 

 the Belgian Congo. 



(4) Plagiolepis (Anoplolepis] nuptialis Santschi (1917). Males 

 taken in Cape Province by Dr. H. Brauns in nests of P. (A.} 

 custodiens Sm. 



(5) Pseudoatta argentina Gallardo (1916). Female and male 

 described from specimens taken in Argentina and supposed to be 

 parasitic in the nests of some fungus-growing ant of the genus 

 Mcellerius, probably M. bahani Emery. 



(6) Xenometra monilicornis Emery (1917, 1921), described 



1 Contributions from the Entomological Laboratory of the Bussey Institution, 

 Harvard University, No. 241. 



150 



