122 HYMENOPTERA. 



of two joints ; anterior wings with one marginal cell, not closed 

 at the apex, one submarginal cell and one discoidal cell. — So 34, 

 35. ^ 



(Genus Diplorhoptrum, Mayr.) 



34. Myrmica fugax. PI. VIII. figs. 25-28. B.M. 



Formica fugax, Latr. Hist. jS!at. Fourm. 265. 



Schill. Bermerk. iih. die in Scliles. S^-c. 56. 

 Myrmica fugax, St. Farg. Hym. i. 184. 

 Schenck, Beschr. Nass. Ameis. 10/. 

 Smith, Brit. Form. 127. 10. 

 Mvrmica flavidula, Nyl. Addit. Alt. Adno. Mon. Form. Bor Eur 



33; Form. Fr. et d' Alger. 99. 27. 

 Di])lorhoptrum fugax, Mayr. Form. Austr. 178. 1; Ungar. 

 Ameis, 21. 1. 



Hah. Europe. 



35. Myrmica molesta. B.M. 



Myrmica molesta. Say, Bost. Journ. Nat. Hist. i. 293. 6 (1834). 

 Myrmica domestica. Shuck. Mag. Nat. Hist. 628 (1838). 



Daniells, Proc. Linn, Sac. ii. 172. 



Smith, Brit, Form. 131. 



Curtis. Trans. Linn. Soc. xxi. 217. 13. 



Nyl. Form. Fr. et d' Alger. 98. 26. 



Hab. Britain ; France ; Brazil (Rio) ; N. America. 



This species has been admitted into the lists of British Ants, 

 but is undoubtedly an importation. The Rev. Hamlet Clark met 

 with a small ant at Rio Janeiro, which he described as being very 

 annoying : it was found everywhere, in-doors and out-of-doors, 

 and ui)on everything; Mr. Clark brought a number of these 

 to England, which have been carefully examined, and named 

 provisionally Myrmica intrudens : this species is undoubtedly 

 M. molesta, which has been introduced in merchandise. In this 

 country it appears to be found in houses alone, and in some 

 places has proved very annoying, rendering some of them vmin- 

 habitable : such was the case at Kemp Town, Brighton ; and many 

 houses in the vicinity of the British Museum swarm with them": 

 in one of these all the sexes were procured from a nest under the 

 kitchen hearth-stone; on turning up the latter it was found to 

 cover a moving mass of ants, which tilled the entire space occu- 

 pied by the stone ; countless numbers were destroved by pouring 

 boiling water on the colony, the females were by this means de- 

 stroyed, and the pest got rid of. The female is of the same 



