300 NOVITATES ZOOLOGICAE XXI. i'Mi . 



iu the collection from the months of April, May, and Jnne, and there are three c? c? 

 from Angust, one from September, and one from July. 



The April specimens number three-fifths of the whole series, and all except 

 three were taken by Dr. Jordan and myself in 1912 ; the three others and the 

 specimens from other months were taken in 1913 by Victor Faroult. 



The form from the Hants Plateaux seems undoubtedly Esper's i-ap/iani, and 

 shows much less individual variation than the more southern desert form alhidice 

 Oberth. They appear to keep more to the eastern side of the valley, near the large 

 water tanks. 



2. Euchloe falloui (Allard). 



Aidhoehariis falloui Gaston Allard, Ann. Sue. Ent. France, Ser. 4. vol. 7. pp. 312 and 318 (18G7) 

 (Biskra). 



This species is extremely rare in Guelt-es-Stel, and there are only 2 cj c? 1 ? 

 in the collection taken by ourselves on April 23, 1912, and Victoria Faroult in 

 March 1913. 



It appears that the Djelfa-Gne!t-es-Stel district is the most northern part of 

 the Hauts Plateaux where this insect occurs. I can find no record of its occurrence 

 north of Biskra and El Kantara in the Province of Coustantine, and there appears 

 to be no record at all iu the Province of Oran. 



Elsewhere it appears in two generations, and the somewhat different ? has 

 been described by Ruber as a distinct species under the name of seitzi ! 



The species is widely distributed, bnt only in desert regions, stretching right 

 across Africa from W. Morocco to Somaliland. The Central Saharan form is 

 apparently different in the summer generation. 



The food plant is Morecandia arrensis suffriitkosa and allied forms. 



3. Euchloe belemia distincta Rober. 



Euchloii belemia disiinckt Rober, in Seilz, Gros.'ssch. der Erde, vol. i. p. 51 (1900) (PliilippeviUe, 

 Algeria) (Gen. aest.). 



Euckloii belemia occurs in two races in Algeria, viz. b. dUtinnta north of the 

 Atlas Mts., and b. desertorum south of the Aurfes Mts., and I cannot see that the 

 form from the " Hauts Plateaux " can be separated from b. distincta ; though 

 the general run of the specimens from Guelt-es-Stel are slightly smaller when 

 compared with the giants from Hammam Rhira. 



The sjjriug form of the northern subspecies flying from January to April 

 dilfers from the form. vern. belemia of belemia belemia iu its smaller size and less 

 extended green bands on the underside of the hindwings ; I name it form. vern. 

 7-dberi form. nov. There appears to be less variation in this species than iu the 

 following one, but iu the form. aest. distincta the amount of yellow on the under- 

 side of the hindwings and the distribution of the streaks is, all the same, very 

 different individually. Spanish sjiecimens, especially ? ? , show occasionally quite 

 as much black above as Algerian ones, and undoubtedly b. distincta is not so 

 distinct from b. belemia as the Central and South Algerian form of ausonia is from 

 the various European races. 



1 have this species from Guelt-es-Stel Irom tlie mouths of March, April, and 

 May 1911, 1912, and 1913 ; those from April 1911 and 1912 having been captured 

 by ourselves. 



In November 1913 Victor Faroult and Dr. Nissen took some five or six 



