LEPTOTHORAX. 155 



abdomen, and the worker has the abdomen nearly entirely fuscous, 

 only the base and apex pale ; it cannot be said to have ' une bande 

 noire transverse sur le bord posterieure du premier segment ' " 

 but neither Curtis, Smith, Farren-White, nor Saunders made any 

 attempt to rectify matters. 



Saunders determined various specimens as unifasciatus, but I 

 was never able to make these agree with Forel's tables, nor with 

 descriptions of that species, and this led to my arranging in 1912 

 for the loan of all the specimens standing under the name of 

 unifasciatus in the British, Oxford, and Cambridge Museums, these 

 included the Saunders, Dale, Rothney, and Perkins collections, etc. 

 Crawley and myself took these and others to Dr. Forel on our 

 visits to him, and he determined nearly all these examples (un- 

 doubtedly correctly) as L. tuberum F., sensu stricto. 



In 1914 Crawley published a revision of the British species of 

 Leptothorax, which has added much to our knowledge of this genus. 

 We appear to possess L. tuberum F., L. nylanderi Forster, L. inter- 

 ruptus Schenck, and L. corticalis Schenck, but the inclusion of 

 unifasciatus in our list requires confirmation as Crawley and I have 

 seen every specimen captured here, with the exception of those in 

 the Curtis collection (now in Melbourne Museum), and have been 

 unable to detect unifasciatus among them. 



Two workers, taken at Hay ling Island in 1883, were presented by 

 Saunders to the Oxford Museum as unifasciatus ; these are deter- 

 mined by Forel as affinis, all the other specimens taken by Saunders 

 on Hayling Island are certainly tuberum. The specimens taken in 

 1883 were recorded by Saunders as occurring under a stone at 

 Hayling, and in 1896 he speaks of large nests of unifasciatus also 

 under stones at South Hayling, whereas Mayr, Forel, and Andre 

 all record affinis as occurring on tree trunks and under bark. I 

 took it at Yvorne in Switzerland in 1912 in a hollow walnut stick ; 

 Dr. Forel told me this is its usual habitat there. It would seem 

 that the two specimens examined by Forel are more probably 

 abnormal forms of tuberum rather than specimens of affinis, a 

 species not actually known to occur in this country, and more 

 material should be collected and examined before we can admit 

 L. affinis Mayr to our list. 



Leptothorax nylanderi Forst. 



Myrmica nylanderi Forster Hym. Stud. 1 53 (1850) 1 ; Schenck Jahr. 

 Ver. Naturk. Nassau 8 135 (1852) 2 . Myrmica cingulata Schenck Jahr. Ver. 

 Naturk. Nassau 8 104-106 144 (1852) 3 . Myrmica tuberum Curtis Trans. 

 Linn. Soc. Lond. 21 216 (1854) 4 . Leptothorax nylanderi Mayr Verh. Zool. 

 Bot. Ver. Wein 5 447-448 (1855) 5 . Myrmica (Leptothorax) cingulata Nylander 

 Ann. Sc. Nat. Zool. (4) 5 93 (1856) 6 . Myrmica (Leptothorax) nylanderi F. 

 Smith Cat. Brit. Foss. Hym. 30 (1858) 7 : Trans. Ent. Soc. Lond. (n.s.) 4 

 1857 280 (1858) 8 . Leptothorax nylanderi F. Smith Ent. Ann. 1868 94 9 . Lepto- 

 thorax tuberum r. nylanderi Forel Denkschr. Schweiz. Ges. Naturw. 26J84 10 

 340 11 416 12 (1874). Leptothorax nylanderi Parfitt Trans. Devon Assn. Sc- 



