A REVISION OF THE GENUS LEPTOTHOEAX, MAYE. 89 



has figured Anthocharis belemia at rest. The forevvings are so depressed 

 that only the green mottled tips are visible when the wings are folded 

 over the insect's back, i.e., the pattern on fore- and hindwings is con- 

 tinuous. Anthocharis helia rests in a precisely similar attitude. 

 Euchloe eupheno (bdia) rests with the attenna) approximated and 

 porrected ; sometimes the costa of the hind-wing is considerably more 

 forward than that of the forewing. That is to say, the forewings are 

 sunk between the hind-wings so that only their tips appear. I noted 

 that EucJdo'e chaiionia rested with the fore- and hind-costte exactly 

 superimposed. Longstaff, however, notes this species as resting with 

 the posterior costa advanced to lie forward of the anterior, though I 

 never noticed this among tw^o score or more of this species. Pontia 

 dapHdice rests with the hind-wing costa just a little in advance of that of 

 the forewing, but this is not so marked as in E. eupheno. 



I expect that many of the facts here recorded seem trivial and dis- 

 connected. More than once I have hesitated to draw any conclusions 

 from my hasty observations, thinking that the facts are undoubted, while 

 any theory I attempted to build upon them might easily be upset by a 

 more gifted, fortunate, or leisured observer. The evidence for or 

 against such theories as mimicry, sexual selection, protective odours or 

 warning colours is, all of it, built up from isolated observations, some 

 of which appear contradictory in the light of our very limited know- 

 ledge. It is by amassing more facts, insignificant individually, perhaps, 

 that we shall eventually be led to sound conclusions in these matters. 

 It is such considerations as these which must form my apology for 

 troubling the reader with these rather detailed extracts from a day to 

 day note book. 



Note. — With the very kind assistance of Dr. F. A. Dixey I publish this 

 synonomy ; I trust it is correct, but the question is very difficult, and my main 

 purpose is not to solve questions of priority, but to show what I refer to as ^'belia." 



1. The Orange Tip. Fyiichloe eupheno, L. 



= belia, L. (and Longstaff, I.e.). 



2. The " white " with green and Anthocharis helia, Cr. 



pearl underside hindwing. =bellidice, Hiibn. 



= bellezina, Boisd. 

 ==tagis, Hiibn. (not of course the Spanish 



species). 

 = crameri, Butl. 



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



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



The following paper is an attempt to rectify the errors in the 

 determination of the sub-species of Leptothorax tuheruvi, Fabr., 

 recorded and described by Farren White, E. Saunders, and others. 



Until the year 1912, all examples of the ti^bennn group taken in 

 Britain were recorded either as mjlanderi, Foerst., or as nnifasciatus, 

 Latr., according as the antennal club in the ^ w^as the same colour 

 as the body, or darker. Mayr^ and ForeP distinguish the ^ of the 

 former from the others chiefly by the impressed line between the 

 mesonotum and metanotum, a character not made use of by either 

 F. Smith, AYhite, or Saunders, In the ^ of unifasciatns one of the 



1 Europ. Formic., 1861, p. 59. 



^ Fourmis de la Suisse, 1874, p. 84. 



