PONERINAE. 335 



4. Monomorium pharaonis L. 



5. Solenopsis geminata F. 



6. Pheidole megacephala F. 



7. Tetramorium guineense F. 



8. Tetramorium simillimum F. Smith. 



9. Tapinoma melanocephalum F. 



10. Prenolepis longicornis Ltr. 



11. Prenolepis vividula Nyl. 



Of these all but the first, the third, and the fifth have been found 

 in Britain, and some of them have become permanent inhabitants 

 of hot-houses and dwellings. 



Forel further gives four more species, which he says are actually 

 becoming cosmopolitan at the present time, viz. : 



1. Plagiolepis longipes Jerdon. 



2. Triglyphothrix striatidens Emery. 



3. Iridomyrmex humilis Mayr. 



4. Cardiocondyla emeryi Forel. 



The second and third of these species have occurred with us. 



I give a list of every species (as far as is known to me) which has 

 been introduced into Britain. The majority of these have not 

 established themselves, and many of them have only been found 

 in the plants, etc., in which they had just reached this country, 

 but it seems advisable to enumerate them all, as it shows how and 

 when they were or might have been introduced, should they obtain 

 a footing here. 



PONERINAE. 



Ectatomma regulare Mayr. 



Gnamptogenys regularis Mayr Verh. Zool. Bot. Ges. Wien 20 965 (1870) 1 . 

 Ectatomma regulare Dalla Torre Cat. Hym. 7 26 (1893) 2 . Ectatomma (Gnam- 

 ptogenys) regulare Emery Gen. Ins. 118 45 (1911) 3 . Ectatomma regularis 

 Donisthorpe Bull. R. Bot. Gard. Kew. 12 368 (191 1) 4 . 



Habitat : Mexico, Central America, Brazil. 



Two workers captured in the propagating pits, Kew Gardens, 

 in 1911 4 . 



Diacamma rugosum Le Guill. subsp. vagans F. Smith 

 var. indie a Forel. 



Diacamma vagans Dalla Torre Cat. Hym. 7 29 (1893) 1 [in part] ; Bingham 

 Faun. Brit. Ind. Hym. 2 81 (1903) 2 . Diacamma rugosum race vagans var. 

 indicum Forel Rev. Suisse Zool. 11 400 (1903) 3 . Diacamma vagans Bingham 

 Bull. R. Bot. Gard. Kew (AS) 5 27 (1906) 4 . Diacamma rugosum subsp. 

 vagans v. indica Emery Gen. Ins. 118 67 (191 1) 5 . 



Habitat : India. 



Captured in a case from Calcutta, Kew Gardens, June, 1898 4 . 



