212 BRITISH ANTS. 



Donisthorpea aliena Forst. 



Formica aliena Forster Hym. Stud. 1 36 71 (1850) 1 ; Schenck Jahrb. Ver. 

 Naturk. Nassau 8 51-53 (1852) 2 . Lasius alienus Mayr Europ. Formicid. 49 

 (1861) 3 . Formica aliena F. Smith Ent. Mo. Mag. 2 30 (1865) 4 : Ent. Ann. 

 1866 127-128 5 : 1869 72 6 : Ent. Mo. Mag. 11 111 (1874) 7 . Lasius niger r. 

 alienus Forel Denkschr. Schweiz. Ges. Naturw. 26 46 8 216 9 376 10 (1874). 

 Lasius alienus Saunders Trans. Ent. Soc. Lond. 1880 209 11 . Formica aliena 

 Parfitt Trans. Devon Assn. Sc-Art. 12 514 (1880) 12 . Lasius alienus Er. 

 Andre Spec. Hym. Europe 2 192 (189 1) 13 . Lasius niger var. alienus Hall 

 Ent. Mo. Mag. 24 91 (1887) 14 . Lasius alienus Perkins Ent. Mo. Mag. 27 

 195 (1891) 15 ; Wasmann Tijdschr. Entom. 34 48 (1891) 16 ; Dalla Torre Cat. 

 Hym. 7 181 (1893) 17 ; Janet Bull. Soc. Zool. France 18 169 (1893) 18 . Formica 

 (Lasius) aliena Farren-White Ants' Ways 28 19 113 20 122 21 175 22 23S-236 23 

 (1895). Lasius niger race alienus Saunders Hym-Acul. 25 (1896) 24 ; Morley 

 Hym. Suffolk 1 1 (1899) 25 . Lasius alienus D. Sharp Camb. NH. Ins. 2 140 

 (1899) 26 ; Donisthorpe Ent. Rec. 12 173 (1900) 27 ; Bingham Faun. Brit. 

 India Hym. 2 342 (1903) 28 ; Janet Obs. Fourmis 42-45 (1904) 29 . Lasius 

 niger race alienus Vic. Hist. Sussex 1 131 (1905) 30 . Lasius niger st. alienus 

 Bingham Bull. R. Bot. Gard. Kew (A.S.) 5 28 (1906) 31 . Lasius alienus 

 Escherich Ameise 220 (1906) 32 . Lasius niger race alienus Frisby Proc. 

 Holmesdale NH. Club 1906 74 33 ; Halbert Irish Nat. 16 44 (1907) 34 ; Donis- 

 thorpe Trans. Leicester Lit-Phil. Soc. 12 224 (1908) 35 . Lasius alienus Mrazek 

 Act. Soc. Ent. Bohem. 4 139 (1908) 36 . Lasius niger alienus Bondroit Ann. 

 Soc. Ent. Belg. 53 485 (1909) 37 . Lasius alienus Donisthorpe Ent. Rec. 23 

 15 (1911) 38 . Lasius niger var. alienus Morley Proc. R. Irish Acad. 31 24 3 

 (191 1) 39 . Lasius niger subsp. alienus Donisthorpe Entom. 44 390 (191 1) 40 . 

 Lasius alienus Bondroit Ann. Soc. Ent. Belg. 55 11 (1911) 41 . Lasius niger 

 subsp. alienus Donisthorpe Ent. Rec. 24 7 (1912) 42 : 25 63 (1913) 43 . Lasius 

 alienus Crawley and Donisthorpe Int. Ent. Cong. Oxford 1912227(1913) 44 ; 

 Donisthorpe Ent. Rec. 26 39 (1914) 45 ; Pinkney Ent. Rec. 26 98 (1914) 46 . 



$ Lighter or darker brown, mandibles, antennae, and sometimes thorax 

 lighter. Lighter in colour, smaller in size and less pubescent than nigra. 



Head not emarginate posteriorly ; frontal furrow indistinct ; ocelli very 

 small and indistinct ; antennae thinner than in nigra, scape without outstand- 

 ing hairs. Tibiae without outstanding hairs. Long. 2-8-3-8 mm. (2-5-4 mm. 

 teste Andre.) 



$ Lighter or darker reddish brown, with mandibles, antennae and legs lighter. 

 Lighter in colour than nigra and less pubescent, the body exhibiting far less 

 " sheen." 



Head small, narrower than thorax, not emarginate posteriorly ; scape 

 without outstanding hairs. Thorax narrower than gaster. Gaster large, the 

 same colour beneath as above. Tibiae without outstanding hairs. Wings 

 large, clear. Long. 8-9 mm. (7-9 mm. teste Andre.) 



$ Lighter or darker brown, mandibles, antennae, and legs lighter. Lighter 

 in colour and smaller in size than nigra. 



Head slightly shining ; frontal furrow distinct, though not as distinct as 

 in nigra, with a slight transverse impression before ocelli ; mandibles with 

 one tooth, yellowish brown ; scape without outstanding hairs. Thorax 

 broadly testaceous at the insertion of the wings. Tibiae without outstanding 

 hairs. Wings clear. Long. 3-3-3-5 mm. (3-5-4 mm. teste Andre.) 



Original description of Formica aliena Forster [Hym. Stud. 1 



36 g c? 71 $ (1850)] : 



" Operaria : Fusca, nitida, cinerascenti-micans, sparse pilosula, antennarum 

 scapo tibiisque nudis ; mandibulis runs, antennis, tibiis et tarsis pallide 

 testaceis ; ocellis minutissimis et linea frontali impressa vix conspicuis ; 



