LEPTOTHORAX. 147 



Table of the Species. 



Antennae 12-jointed 2 



Antennae 11-jointed (subgen. Mychothorax Ruzsky) 1 acervorum F. 



2 / Club not darker than the rest of antenna 3 



(1) \ Club darker than the rest of antenna 4 



3 ( An impression between mesonotum and epinotum ; spines long . . . 

 I 2 nylanderi Forst. 



(2) j No impression between mesonotum and epinotum ; spines short 



I 3 corticalis Schen. 



4 j Epinotal spines longer, curved 5 interruptus Schen. 



(2) ( Epinotal spines shorter, not curved 4 tuberum F. 



1 / Antennae 12-jointed 2 



- \ Antennae 11-jointed acervorum F. 



2 / Club not darker than the rest of antenna 3 



(1) \_ Club darker than the rest of antenna 4 



3 / Gaster banded ; spines long nylanderi Forst. 



(2) \ Gaster not banded ; spines short corticalis Schen. 



4 C Scutellum striate ; spines shorter tuberum F. 



(2) -j Scutellum smooth and shining in centre ; spines longer 



I interruptus Schen. 



3 



Antennae 13-jointed 2 



Antennae 12-jointed acervorum F. 



2 / Mesonotum smooth and shining between the Mayrian furrows . . 3 



(1) \ Mesonotum not smooth and shining between the Mayrian furrows - 4 



3 / Epinotum armed with small tubercles corticalis Schen. 



(2) \ Epinotum without or with very faint tubercles nylanderi Forst. 



4 f Joints 2-5 of funiculus as broad as long interruptus Schen. 



(2) \ Joints 2-5 of funiculus longer than broad tuberum F. 



Leptothorax acervorum F. 



Formica acervorum Fabricius Ent. Syst. 2 358 (1793). 1 Formica rubra 

 var. acervorum Latreille Hist. Nat. Fourmis 250 (1802) 2 . Formica graminicola 

 Latreille Hist. Nat. Fourmis 255 (1802) 3 . Myrmica acervorum Zetterstedt 

 Insect. Lappon. 1 451 (1838) $ ? 4 . Myrmica lacteipennis Zetterstedt Insect. 

 Lappon. 1 452 (1838) $ 5 . Myrmica acervorum Curtis Trans. Linn. Soc. Lond. 

 21 215 (1854) 6 ; F. Smith Trans. Ent. Soc. Lond. (n.s.) 3 124-125 (1855) 7 . 

 Leptothorax acervorum Mayr Verh. Zool. Bot. Ver. Wien 5 436 (1855) 8 . Myrmica 

 (Leptothorax) acervorum F. Smith Brit. Foss. Hym. 29 (1858) 9 : Trans. Ent. 

 Soc. Lond. (n.s.) 4 1857 280 (1858) 10 . Leptothorax acervorum Forel Denkschr. 

 Schweiz. Ges. Naturw. 26 84 341 403 (1874) 11 ; Cameron Proc. NH. Soc. 

 Glasgow 2 294 (1876) 12 : 3 90 (1876) 13 : 3 105 (1877) 14 . Myrmica (Lepto- 

 thorax) acervorum Service Scot. Nat. 5 63 (1879) 15 . Leptothorax acervorum 

 Parfitt Trans. Devon Assn. Sc-Art. 12 516 (1880) 16 ; Saunders Trans. Ent. 

 Soc. Lond. 1880 219 17 ; Er. Andre Hym. Europe 2 294 (1881) 18 ; Dale Ent. 

 Mo. Mag. 17 236 (1881) 19 ; Rothney Ent. Mo. Mag. 18 262 (1882) 20 ; Bridg- 

 man Trans. Norf. Norwich Nat. Soc. 4 690 (1889) 21 ; Wasmann Stett. Ent. 

 Zeit. 51 309 (1890) 22 : zusam. Nest, gemischt. Kolon. Ameisen 8 (1891) 23 ; 

 Rothney Ent. Mo. Mag. 28 50-51 (1892) 24 ; W. Gardner Brit. Nat. 2 23 

 (1892) 25 ; Dalla Torre Cat. Hym. 7 122 (1893) 26 ; Rothney Ent. Mo. Mag. 

 29 67-68 (1893) 27 ; Farren- White Ants' Ways 171 243-244 (1895) 28 ; Carpenter 

 Irish Nat. 4 257 (1895) 29 ; Wasmann Biol. Centralb. 15 618-619 (1895) 30 ; 

 Saunders Hym-Acul. 37 (1896) 31 ; Service Scott-Elliott's Flora Dumfriesshire 



