SCJEXCE-GOSS/r. 



third i>r fmitlh day of its existence. Tin; romark- 

 nlile instinct possessed l>y a lilind, naked, and 

 apparently helpless cr.atiire to enable it to perforin 

 such a feat strikes one with as much astonishment as 

 does the Mrenylh eshiliited in its achievement. 



The procedure of the younu cuckoo in ejecting 

 other birtis from the nest is to work its iHidy under 



that of its foster-liroiher, then, halanciny ils burthen 

 in the natural cavity existing (at thi^agejin the centre 

 of the usurper's Ijack, it forces the young bird gradu- 

 ally up the side of the nest, until, with :i tnvd efri.ri. 

 the victim falls over the rim. 



42 Dalmeiiy Rinul, Tiifilell /'iiilt, 

 London, N. IV. 



hutti-:rflii-:s of tiii-: r.\LAE.\R< "iic region. 



Kv Hknkv Chakies Lan<;, M.U., M.R.C.S., L.K.C.r. LoM.. 

 {Conlimicil from page 336.) 



'ienus 10. PIEKIS Schrank. 



'Trills genus was named by Schrank in " Kauiia 

 Boica," pp. 152-162 (iSoi). /Vt'm cimtains 

 butterflies ranging in expanse from rather large to 

 medium size. .Second sub-costal nervure not given 

 iifl'at the extreme end of the disc, cell of f.w., as in 

 Aporia. Antennae long, distinctly articulated, and 

 terminated by a very distinct club. All ihc I'alac- 



ricria kreltnci-i. 



arctic- species have the ground colour of the wings 

 white, with the exception of a few aberrant forms. 

 •The apices of the f.w. are generally marked with 

 black, anil there is nearly always a black spot near 

 the inner margin in the female. The black markings 

 are always more developed in that sex than in the 

 male. The hind wings are decorated on the under 

 side with green or yellow scales, variously disposed, 

 but having a tendency to follow the course of the 

 neuration, or to form quadrate or triangular blotches 

 between the nervures. 



Lakvae. Long, cylindrical, pubescent, slightly 

 lapering at the extremities, marked with longitudinal 

 stripes, more or less granulated on the surface. They 

 feed usually on li>w herbaceous plants, and principally 

 on those belonging to the order Cruciferae. 



I't'l'AK. .Angular, terminated anteriorly by a 

 ■single point. 



1. P. hippia Hrem. Hull. Acad. I'd. III. p. 464. 



(i) This series of ;irticlcs on Hutlerflies of the P.^l.■le.'\rclic 

 Kci:ion ciimmenc«l in SciKSCE-tlossn-, No. 61. June 1S99. 



1S61. Aforia /ii/>pia R. II. p. 1 17. Cralaegoii/es 

 Luc. .\nn. Km. Soc. l'ran(,-. 1S66, p. 503. 



56—73 mm. 



lias somewhat the appearance of Aporia oalai/gi, 

 but the fore wings are more pointed and the h.w. less 

 rounded than in that species. They are more densely 

 scaled and of a duller white above. There is not 

 that entire absence of any pattern seen in Apona 

 (airopio = " poverty "). I'.w. with triangular marginal 



riifis liavitiis. 



.spots most marked near the apex, a black elongated 

 spot at the ottter edge of the discoidal cell. Beneath, 

 the f.w. are white with broad grey lines following the 

 course of the nervure.s. 11. w. Above, very much a; 

 in Aporia cratacgi. U.S. ground colour, light ochre-' 

 yellow, grey lines along the nervures, base narrowly 

 bright yellow. Head, thorax, and abdomen black. 

 .\ntennae black, with well-marked clubs. 

 Hab. .\mur. .\sk. Vlad. Chabar. etc. \ II. 

 Lak\a. Rather larger than that of A. aalaegi, 

 with a longitudinal brown dorsal line and a Lateral 

 row of lirown spots; the hairs on the first and last 

 segments rusty-red, otherwise greyish. K. II. On 

 Birhcris sinensis and B. umiirensis. 



a. var. liansdianica drum. 50 — 57 nnti. .V 

 smaller and darker form, and more strongly coloured 

 beneath, than type. Uab. Tianschan. 



h. var. martin.li (Jberth. .\ light form described 

 by Oberthur from Thibet. 



2. P. kreitiieri liiv. R. H. p. 118, 709. 

 50 — 55 mm. 



