160 THE ENTOMOLOGIST. 



nearly the larva of M. lachesis approaches that of M. galatea, 

 the brownish-white form. The late Th. Goossens, who made a 

 large collection of larvae, and whose " Iconographie des 

 Chenilles " is published in the Bulletin of the Association des 

 Naturalistes de Lavallois-Perret, reported {loc. cit., 1902, p. 8) 

 that he had possessed this larva, and observes that the caudal 

 spikes are shorter than those of Galatea. 



In conclusion, I take the liberty to quote a passage from 

 M. Eene Oberthiir's letter on the subject to which I have 

 alluded : 



" While crossing the Department of Aude I accidentally 

 came on a spot where Lachesis and Galatea were flying together. 

 The form of Galatea was very dark (= Procida), but was already 

 on the wane — it was the 16th of July. On the other hand, 

 Lachesis was, or seemed to be, at the zenith of its emergence. 

 The first example taken by me I thought to be an aberration, 

 so completely did it differ from the form of the Pyren^es- 

 Orientales ; but from several taken afterwards I recognised that 

 I had secured a quite special form." 



M. Oberthiir then goes on to indicate the exact locality, and 

 adds that, continuing his journey to Vernet-les-Bains, he did not 

 again on the way encounter Lachesis. 



This valuable observation, therefore, seems to me to suggest 

 that Galatea and Lachesis approach one another gradually and 

 by approximating forms, and may not even yet be divided by a 

 hard-and-fast line: " Ces deux especes peuvent done bien 

 s'entendre a I'occasion." 



Enough has been said, also, to demonstrate how closely the 

 immediate developments of Galatea approach the generic type 

 form, and to warrant the assumption that ^^hiXe Galatea and Lwcasi 

 have hardly yet separated sub-species from species, Galatea, 

 Lachesis, and lapygia have arrived at a more pronounced stage 

 in the evolution of species, even though there may still be points 

 where they meet and may even intermingle, producing inter- 

 mediate forms. 



I may add, finally, that this review was compiled by me 

 nearly three years since — before the war — and that if there are 

 errors, more especially as regards authorities, I must plead the 

 preoccupations of the moment as an excuse for leaving my 

 references unverified. The only amendments I have made in 

 the original script follow naturally upon our enlarged knowledge 

 of the distribution of the several western species, due to the 

 investigations of M. Eene Oberthiir {in litt.) and M. Eondou, 

 already acknowledged. 



Erratum et Addendum. 

 Page 122, line 12 (aiitea),for " Basses-Alpes," read " Basses-Pyrenees." 

 Id. line 21. Dr. J. N. Keynes also reports Lachesis on the Spanish side of the Port 



de Gavarnie, in the lower part of the Val d'Arras on July 10th, 1909 



('Entomologist's Record,' xxii, 1910, p. 110). 



