26 MYRMICA CjESPITUM. 



autennac geniculated, and produced at the elbow into an acute 

 lobe or tooth. 



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

 taneous ; the mandibles, apex of the scape, rlagellum, 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. 



TETRAMOR1UM, Mayr. 



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

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

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



6. Myrmica (Tetramorium) caespitum. 



Foemina. — Fusco-nigra, nitida, flavido-pilosula; mandibulis, an- 

 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. 



Formica caespitum, Linn. Faun. Suec. no. 1726 ; Syst. Nat. i. 963. 

 IIS. 



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

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



Linn. Soc. 

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

 'Fr. et d' Alger. 80. 13. 



Foerst. Hym. Stud. Form. 50. 29. 

 Schenck, Beschr. Nass. Ameis. 86. 



