( 110 ) 



journey we saw two in tlie same neigliliourliood, bnt obtained only one, on April 30. 

 Later on, from El-Hadadra northwards to Gliardaia, P. machaon was frequently 

 seen, and at El-Hadadra (2;S. v.) and from Gaa to Sebseb (26. v.) it was quite 

 common ; bnt many sjiecimcns were battered and worn, so tlnit only a few were 

 taken. It was also seen in some numbers at Ghardaia, and two were caught. It 

 was always found along the " oiieds," and was most commonly seen on the flowerB 

 o( Decerra scoparia, a large plant with a strong smell somewhat between that of 

 parsley and fennel. On the Deecrra the cateri)illars were also found, about half 

 grown and smaller still, between El-Hadadra and Seb.seb. — E. H.] 



2. Pieris rapae leucotera Stef ? 



3 S6, Touggonrt; 1 6, Bled-el-Ahmar ; 1 <J, El-Golea. 



Picrin rnpae is fairly abundant all over Algeria, though not nearly so much so 

 as in Europe. South of the Atlas it occurs, as far as we know, all over the Sahara, 

 but exclnsively in the oases. Tlironghout its ranges botli in the I'alacarctic and 

 Nearctic regions it is subject to much variation, individual as well as geographical, 

 and the three generations are also distinct. Pieris rapae rapae form. vern. 

 metro, Ste]ih. is the sjjring brood, form. aest. rapae Linn, is the summer brood, and 

 form. ant. leucosoma. Shaw is the third or autumn brood. Though the series in the 

 Tring Museum numbers many hundreds of specimens, it is still woefully insufficient 

 to enable a correct classification of this sjjecies to be made ; so I have quoted the 

 desert form nnder Dr. Stefanelli's name with a (jucry. The great bulk of the 

 specimens found south of the Atlas are characterised by the pale or almost obso- 

 lescent dark ape.x to the forenings, which on the npj)erside in the cJ also rarely 

 if ever show two dark spots. Those from north of the Atlas also have th? black 

 markings much more reduced than in European examples. If the many collectors 

 of Palaearctic and Nearctic lepidoptera would only collect every common species in 

 large series from each and every possible locality, we should be much sooner able 

 to give a correct systematic and zoogeographical review of the Ilolarctic Fauna 

 than will be possible for many years to come under present conditions. 



[We only saw this species in the gardens of Touggonrt, in the little oasis of 

 Bled-el-Ahmar, near Touggonrt, and at El-Golea; but, I believe only three were 

 seen altogether in the latter place, one of which was in a fair condition and 

 preserved. This " white " was only seen in gardens where turnips, radishes, or 

 cabbages were grown, its caterpillar doubtless living on some of these plants, though 

 we found none. — E. H.] 



3. Pieris (Leucochloe) daplidice albidice Oberth. 



10 (?c?, 13 ? ?, El-Hadadra ; 28 cJc?, 5 ? ?, Ghardaia ; 4 cJcJ, sands of El- 

 Arich ; 1 S, Bled-d-Ahmar ; 1 S, Biskra; 1 ?, EI-Golea; 22 <?<?, 3 ? ?, South 

 Oued My a ; c?J, I ?, north of Aiu Guettara. 



Tliis series of '.*.") specimens fairly illnstratcs the extraordinary variation both 

 in size and colour in tln.jiVnlicc in the more southern jiortions of its range. South 

 of the Atlas Mountains the colour of the underside of the hindwings ranges from 

 dark yellowish olive-green with three rows of white spots, through many inter- 

 gradations to white with canary-yellow cloud-like smears. The smallest $ has the 

 forewing 17 mm. in length (Ghardaia), while the largest has it 25 mm. (N. of 

 Ain Guettara); the smallest ¥ has a forewing of 19 mm. (Ghardaia), and the 



