26 MYRMICA C^ESPITUM. 



antennae geniculated, and produced at the elbow into an acute 

 lobe or tooth. 



Male. Length 2 lines. Dark fuscous, sometimes obscure cas- 

 taneous ; the mandibles, apex of the scape, flagellum, articu- 

 lations of the legs and the tarsi, pale testaceous ; the antennae 

 slightly curved or subgeniculated at the base ; the abdomen 

 very smooth and shining. 



I have obtained specimens of the M. lobicornis of Nylander, 

 and on comparison with others I am quite satisfied of their iden- 

 tity. I am not aware of any one having captured this species 

 except Mr. Curtis, who found it in Scotland in the year 1825. 



TETRAMORIUM, Mayr. 



The maxillary palpi 4-jointed ; the labial palpi 3-jointed ; the 

 anterior wings with one marginal, two subinarginal, and one dis- 

 coidal cell ; the club of the antennae 3-jointed. 



6. Myrmica (Tetramormm) csespitmn. 



Foemina. Fusco-nigra, nitida, flavido-pilosula ; mandibulis, <m- 

 tennarum flagellis, articulis pedum tarsisque pallidis ; capite, 

 pleuris et metathorace longitudinaliter striatis, opacis ; meta- 

 thoracis spinis mediocribus validiusculis, obtusiusculis ; alis 

 hyalinis, stigmate dilutis. 



Operaria. Fusco-nigra, sparse pallide pilosula ; mandibulis, 

 antennis pedibusque articulis et tarsis rufo- pallescentibus ; 

 capite thoraceque subtiliter longitudinaliter rugulosis ; spinis 

 metathoracis minutis, dentiformibus ; nodis petioli sublaevibus. 



Mas. Niger, nitidiusculus ; mandibulis, antennis pedibusque 

 sordide pallescentibus ; capite parvo, thorace subtiliter stria- 

 tulis ; antennis 10-articulatis; alis hyalinis, nervis pallescenti- 

 bus, stigmate pallide fuscis. 



Forrnica csespitum, Linn. Faun. Suec. no. 1726 ; Syst. Nat. i. 963. 

 11$. 



Latr. Hist. Nat. Fourm. 251. 1. 10. f. 63. 

 Formica binodis, Linn. Amcen.Acad. vi. 413. 94, type in Cab. Mus. 



Linn. Soc. 



Myrmica fuscula, Nyl. Adno. Mon. Form. Bor. Eur. 935. 6 ; Form. 

 'Fr.etd'Alger.86.13. 



Foerst. Hym. Stud. Form. 56. 29. 

 Schenck. Beschr. Nass. Ameis. 86. 



