NOVITATKS ZOOLOGICAE XXIV. 1917. 85 



[Euchloe falloui (Allard). 



I divided this insect into two subspecies, naming the purely desert insect 

 E. falloni ohsolescens, but stated that the specimens of obsolescent are evidently 

 a second or summer brood, showing the same characters differentiating it from 

 the first brood as do the second broods of ausonia and belemia, as opposed to 

 their respective first broods. The Ghardaia specimens of the first brood of 

 /. ohsolescens show very little difference from El Outaya first-brood specimens^ 

 but I have ten second-brood specimens captured at Oued Hamidou between 

 Alger and I'Arba and eight from El Kantara which are not at all like the second 

 brood from the desert. Bou Saada second-brood specimens are certainly not 

 all alike, but average about 85 per cent, with fully developed green bands and 

 about 15 per cent, either ohsolescens or mtermediates. I think, therefore, that 

 we are justified in maintaining ohsolescens as a distinct race and regarduig those 

 from Bou Saada as somewhat in a transitional condition.] 



16. Euchloefalloui falloui (Allard). 



Anthocharia fallotii Gaston Allard, Ann. Soc. Entom. France, Ser. 4. vol. vii. pp. 312 and 318 (1867) 

 (Biskra). 



The only difference I can see between the first brood of /. jallovi and that 

 of /. ohsolescens is that the latter has the green bands more sage-green and some- 

 what naiTOw, while the former has them broad and more olive-green. (The 

 Bou Saada ones have these bands very olive.) 



34 Col de Sfa, Biskra, February— March 1908-1911, VV. R. and E. H. and 

 Staudinger (3). 



8 El Kantara, August 1911, Faroult. 

 26 El Outaya, March 1911, Faroult. 

 8 Khenchela, June 1911, Farouh. 

 10 Oued Hamidou, June 1912, Faroult. 



33 Laghouat, March— April 1911-1912, W. R. and E. H. and Faroult. 

 1 A'in Draham, July 1911, Faroult. 



3 Guelt-es-Stel, April 1912-1913, W. R. and K. J. and Faroult. 

 1 Djebel Senia, February 1910, Faroult. 



The British Museum has the following specimens : 5 Hammam-es-Salahin, 

 April 1904, Lord Walsingham ; 1 Tkoiit, April 1906, Lord Walsingham ; 1 

 Biskra, May 1885, L. Bleuse ex Ehves coll. ; 1 Biskra, February 1894, ex Elwes 

 coll. ; 1 Mauretania, Grum-Grshimailo coll. ex Elwes coll. 

 The series at Tring comprises 124 specimens. 



16a. Euchloe falloui form, transit. 



The bulk of the specimens present little variation from the typical form, 

 though in nearly all the green bands are much shaded with brownish olive, but 

 from 5 to 15 per cent, show either a transition to or all the characters of 

 /. ohsolescens. 



147 Bou Saada, May— August 1911-1912, Faroult. 



6 Djebel Kerdada, May 1912, Faroult. 



