( 115 ) 



The Nortli Algerian and Tniiisian form has been treated by Oberthiir and others 

 as the ordinary didijmu oi'.fi(hiit(di.<i, bnt it is abnndantly distinct. I hei'e propose 

 for this form the name M. didyma nisseni subsp. nov. ; it differs from its nearest 

 ally M. (li(h/ma occidentaUs by its paler ground colour, larger number of black discal 

 spots, and the heavy, sharply defined black margins to the hindwings. 



Type S, No. lool, Ain Draham, Tunisia, July 101], Victor Faronlt. The form 

 found in the Aures Mountains and probably all over the " Hants Plateaux " is much 

 larger, being equal in size to M. d. deserticola : it has the darker red colour of 

 d. nisseni and d. occidentaUs, but has much fewer spots, thus approaching d. deserti- 

 rold. I ])ropose tlie name of M. didyma interposita subsp. nov. for it. Type i , 

 No. 19n, Batna 1911, Nelva coll. This form has also a very different underside, 

 both the fulvous bands and the black spots being much reduced in size and mni^h 

 more ill-defined, 



[Only seen as far south as Kef-el-Dor, and not farther north than Chegga, 

 though Mr. Rothschild and I have caught this form near Biskra, and farther north 

 in former years. In 1909 not a single specimen was seen south of Biskra, though 

 they were rpiite common 05 kilometres south iu one place on the road this year. 

 — E. H.] 



13. Melitaea didyma harterti subsp. nov. 



5 c?c?, 3 ? ?, norHi of El-Golea ; 4 c?(?, South Oued Mya; 3S 3i,2\ ? ?, 

 El-Hadadra; 8 cJJ, 2 ? ?, Ghardaia ; 1 ?, 20 kilometres east of Ghanlaia : 1 ?, 

 Oued Segrir, Guerrara : 1 c?, Oued Noa ; 1 ? , sands of El-Arich. 



This large series of 8.j specimens varies a s^reat deal in the number and size of 

 the discal black spots, but the essential characters which separate this form from 

 d. deserticola are present in all of them. 



Differs above from d. deserticola by its much paler sandy ochre colour and much 

 reduced black marginal bands ; and the almost entire absence of tlie subapical 

 yellow spots is also a distinguishing character. The ? ? in most cases have the 

 black spots much reduced both in size and number. The Oued Nca specimen is 

 the only one in which the ground colour approaches that of d. deserticola. Below 

 in the t?cj the black spots on the hindwings are smaller and the fulvous bands 

 bi'oader and better defiued. In colour this new form is intermediate between M. d. 

 (kserticola and M. acraeina from Central Asia. 



The discovery of this form extends the range of M. didi/nm about lOiHi kilo- 

 metres to the south. 



[This pri^tty butterfly was rare in the Oued Mya in May, but ([uite common in 

 some places between (lihardaiaand El-Golea. It was mostly flying along the oueds, 

 and rarely seen on the plateaus. It came very much to the flowers of Deverrd 

 acoparia and other flowers. — E. H.] 



LYCAENIDAE. 



14. Tarucus teophrastus teophrastus (F.). 



8 <?(?, 1 ?, Ghardaia; 18 Si, El-Hadadra ; 2 c?c?, North of Aiu Gucttara; 

 9 JcJ, 1 ?, South Oned Mya; 1 3,2 ? ¥, Oued Nca. 



The Oued Mya e.Kanii)l('s, with the exception of one spccinicn, and one of the 

 two from north of Ain (ineltara,, are very ninch smaller; as the following measure- 

 ments show. 



