MYRMICA FUGAX. 33 



tate; antennae 13-jointed; the legs pale, with the femora more 

 or less fuscous ; the metathorax with two short erect teeth ; the 

 wings milky- white. The insect sprinkled with thin pubescence. 



I have long suspected Stenamma to be a male of some small 

 species of Myrmica. Nylander, who has carefully examined 

 the Stenamma in the collection of the British Museum, says it is 

 the male of M. nitidula ; such being the case, it is only com- 

 mon justice to restore Westwood's name to this species, and 

 Stenamma should be used as the subgeneric name, having the 

 priority of Formicoxenus. This species is found in the nests of 

 Formica rufa and F. congerens ; it has never been observed in 

 any other situation. The worker was first discovered in this 

 country by Mr. G. R. Waterhouse, since which, others have met 

 with it when searching for Myrmecophilous Coleoptera. 



DIPLORHOPTRUM, Mayr. 



The workers very minute ; the labial palpi 2-jointed ; the 

 maxillary palpi 2-jointed; antennae of the workers 10-jointed, 

 the club 2-jointed; antennas of the male 12-jointed; anterior 

 wing with one marginal, one submarginal, and one discoidal cell. 



12. Myrmica (Diplorhoptrum) fugax. 

 F&mina. Fusco-nigricans, tenuiter pilosula; mandibulis, an- 



tennis pedibusque pallide rufescentibus ; clypeo margine bi- 



dentato. 

 Operaria. Pallide flavescens, Isevis, nitida; antennarum clava 



flagelli biarticulata ; metathorace declivi, mutico ; pedibus pal- 



lescentibus ; abdomine medio supra subfasciatim fuscescente. 

 Mas. Niger, nitidus, tenuiter pilosulus ; antennis pedibusque 



fuscis ; mandibulis tarsisque pallescentibus. 



Formica fugax, Lair. Hist. Nat. Fourm. p. 265. 



Schill. Bemerk. ub. die in Schles. Sfc. p. 56. 

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



Schenck, Beschr. Nass. Ameis. p. 107. 



Smith, Brit. Form. p. 127. 10. 



Nyl. Form. Fr. et d'Alger. p. 99. 



Myrmica flavidula, Nyl. Addit. Adno. Moru Form. Bor. Eur. p. 33. 

 Diplorhoptrum fugax, Mayr, Form. Austr. 178. 1. 



Female. Length 2 lines. Dark fuscous, thinly pubescent and 

 shining ; the mandibles, antennae and legs pale ferruginous ; 



