548 iloVlTATES ZOOLOGICAE XXlV. 191?. 



et Index Methodicus, 1840, p. 84. No. 655, Dicramira furcula var. uroceru, and 

 the locality given being Montpellier. As Mr. Oberthiir has l)e Boisduval.s col- 

 lection, I suppose he had the type of urocera before him, but I cannot sec from 

 the series before me of bifida from north of the Mediterranean — viz. 63 from 

 Bexley, Kent ; Crimmitschau ; Strausberg, BerUn ; Germany (Grum-Grshi- 

 mailo coll.) ; Liebenau, Bohemia ; Poschiavo, Itahan Alps ; Tarasp, Enga- 

 dine ; Silva Plana, Engadine ; Herculesbad, Hungary ; C'auterets, Pyrenees ; 

 G^dre, Pyrenees — any specimens like my Algerian series. The specimens of 

 urocera I have from Tarasp are nearest to the Algerian ones in shade of "ground- 

 colour," but the bands in these Engadine specimens are much broader, and, 

 moreover, not a single European specimen shows any sign even of constriction 

 in the band. I therefore have come to the conclusion that the Algerian Cerura 

 is a form of bifida with a .strong tendency to the interruption of the band, and 

 that it is as yet an unnamed form.] 



48. Cerura bifida interspersa subsp. nov. 



Differs from bifida nrocera Bold, in tlie band being narrower when fully 

 developed in the ??, usually being strongly constricted in the middle. The 

 (J (J usually have the band either interrupted at median vein or else reduced to 

 a narrow line, but one <J from Khenchela and one from Bon Saada have the 

 band entire, though shghtly concave, both basad and distad. 



Habitat. Algeria, Tunisia ? 



11 Batna, May — June 1910-1912, A. Nelva and M. Bartel. 

 3 Khenchela, May— July 1911-1912, W. R. and K. J. and Faroult. 

 5 Bou Saada, March — May 1912, Faroult. 

 The Tring series totals 19, 



49. Dicranura vinula delavoiei Gascb. 



Dicranura vinttla var. delavoiei Gaschet, Ann. Soc. Entom. France, »er. 5. vol. vi. p. 522 (1876) 

 (El-Eamau, Algeria). 



Mr. Oberthiir considers this to be a distinct species from vinula, but as it 

 replaces it geographically and exhibits no very striking diflerences I prefer to 

 treat it at present as a subspecies only. 



We ourselves have only taken it at Khenchela, Timgad, and Oran, in single 

 examples at each latter place and a pair at Khenchela. 



5 Le Kreider, Prov. Oran, April 1916, Rotrou. 

 2 Magenta, Prov. Oran, April 1916, Rotrou. 



1 Oran, April 1913, W. R. and K. J. 



6 Environs d' Alger, April 1905-1910, Dr. Nissen and Captain Holl. 



1 Boghari, May 1913, Faroult. 



6 Guelt-es-Stel, May 1913, Faroult. 

 12 Environs de Batna, 1909-1912, A. Nelva. 



2 Khenchela, May 1912, W. R. and K. J. 

 1 Timgad, May 1909, W. R. and E. H. 



4 larvae, Khenchela and Hammam R'ihra, Faroult. 



4 cocoons, 7 pupae, and a batch of eggs, Khenchela, Faroult. 



The series at Tring numbers 36. 



