106 THE entomologist's record. 



is any difference between the foi-ewings of fig. 2 lefehvrei, and fig. 4 

 inelas. These are in some degree exceptional. In melas, fig. 4 is a 

 fairly usual example and agrees with fig. 5 in having veins 6, 7, and 

 10 well separate at their origins. In lefehvrei, fig. 2. it will be seen 

 that though vein 10 is well separate, vein 6 is not. The most usual 

 form in lefehvrei is shown in fig. 3, in which veins 7 and 10 originate 

 almost together. But frequently they quite coalesce at their origins 

 and vein 10 may arise from vein 6, even a considerable way along it 

 as in fig. 1. In melai^ the origin of vein 10 is fairly constant as in the 

 figures presented. In the hindwing there is no appreciable difference 

 unless it be that, similarly to the forcAving, veins 6 and 7 are rather 

 closer together in lefebcrei. 



The essential difference between the two species then is, that in 

 E. iiiela^, the forewing has veins 6, 7, and 10, well separate in origin 

 from the cell, and varies little and rarely from that arrangement. 



K. lefebvrei may be almost the same as E. nielas but rarely, usually 

 either vein 6 or vein 10 arises in common or almost in common with 

 7 or even arises out of that vein ; it is more variable than melas. 



EXPLAXATION OF PlATES. 



Male appendages x 16. 



A Revision of the Genus Leptothorax, Mayr., in the British Isles. 



By W. C. CEAWLEY, B.A., F.E.S. 



(Concluded from page 96.) 



MALES. 



Table of j <j . 



Antennae 12-jointed. Mandibles without teeth .. .. .. L. acervorum, F. 



Antennae 13-jointed. Mandibles dentate.. .. .. .. .. ..1. 



1. Mesonotum smooth and shining between the converging lines .. .. 2. 

 Mesonotum finely rugose between the converging lines . . . . . . 3. 



2. Epinotum with tooth-like tubercles. L. tttberum, F. subsp. corticalis, Scb. 

 Epinotum without tooth-like tubercles . . . . . .subsp. nylanderi, Foerst. 



3. .Joints 2-5 of funiculus as broad as long . . . . subsp. inter ruptus, Sch. 

 .Joints 2-5 longer than broad . . . . . . . . . . . . . . 4. 



4. Epinotum with tooth-like tubercles .. .. suhs^. tuberuiit (s.str.), F. 

 Epinotum without tooth-like tubercles . . . . . . . . . . . . 5. 



.5. Pedicel very long and cylindrical . . . . . . subsp. affinis, Mayr. 



Pedicel not quite so cylindrical ; petiole slightly raised in 



centre .. .. .. .. .. .. . . suhs^. unifasciatus, Ltr. 



