SCIENCE-GOSSIP. 



••f wire, may not give exactly similar results with con- 

 densers of equal capacities inserted. Manufacturers 

 when testing a coil Iniild u|> ihe capacity of the con- 

 denser 111 the best value for that one coil. 



Suflicicnt has been said to show the importance of 

 having a. thoroughly constructed coil, for the strain 

 pul upon the insulation is very great at limes, and 

 once ihe secondary is hmUen down, the coil is almost 

 useless. Even the ([ualily of the wax used in the 



i6>^ 



process of construction is an important matter. Some 

 little lime ago, the writer ha<I to insiilule a whole 

 series of experiments to discover why some coils re- 

 fused to give their calculated spark lengths. It wa.s 

 (|uite two months Ijefore the cause was I raced to some 

 slightly inferior and soft paraffin wax having l>ecrt 

 used ill ihe winding. 



(To be continued.) 



BUTTERFLIICS OF THE PALAKARCTIC REGION. 

 Bv Uknry Chakles Lang, M.D., M.R.C.S., L.R.C.P. Lo.nd. 



{Continued from page 147.^ 



Geni's 5. IIYI'ERMNliS'JKA Men. 

 hmcne Nick. 

 ■\ X 'INCiS not eniarginale, somewhat rounded, of a 

 ' ' pale yellow colour somewhat like that of 

 'I'ltais eerisyi i . rallern uf wings rather like that 

 of J'aniassiiis, with black and red spots. Sub-costal 

 nervure of f.w. four-branched. I'alpi and antennae 

 as in /'aniassiiis. No abdominal pouch in 9 • 



I. H. helios NJLk. 



4S -52 nun. 



Wings in 6 pale creamy yellow. F.w. with two 

 black coslal spots and external to these one large and 

 ivio small red spots, placed one above the other, 

 surrounded by a black edge and coalescent, apex 



Hypenitnrstrti /tciios ^ and y . 



blackish with white spots, reminding one of 

 Anihochans. H.w. with a very small cenlral and 

 costal red spot, two faint bands of greenish grey in 

 the central and sub-marginal areas, base and ou. 

 tnarg. narrowly black. ? larger and more strongly 

 marked ; ground colour, generallv deeper than in i . 

 F.w. with a distinct black spot near centre of inner 



marg. L'.s. f.w. as above but lighter, h.w. marbled 

 wilh light green and white. 



IIab., the Steppe lands of Turkestan, N. Persia, 

 Sea of Aral, Tekke. IV., V. 



Larva. "Thick, very like that of P. machaon, 

 light green." R. and II. On Zygophylluiii turcomani- 

 euiii. I\'. e. Pupa is said to be buried in the ground. 



a. var. maxima Stgr. 56 mm. A larger and more 

 brightly marked form. IIab., Turkestan. 



/'. ab. oehraceomaculata Grum. An aberration 

 with yellowish spots in place of red. Hah., Steppes 

 in the neighbourhood of Bokhara. IV. 



Genus 6. DOKITIS, O. 

 Antennae rather short with a recurved club. I'alpi 

 short and hairy. F.w. with sub-costal nervure 



Doritis apoltinns var. bellutgns. 



5 -branched. Female without abdominal pouch. 

 Wings not white, but f.w. semi-transparent. This 

 remarkable and beautiful genus contains but one 

 species, it is quite distinct from Paniassius and is 

 limited to Asia Minor and Syria. Possibly it may be 

 found in European Turkey and the Greek Islands. 

 It is figured by Hoffmann as European. 



I. D. apollinus Herbst. Lg. B.E., p., 14, pi. 

 III., fig. 6. 



50 — 62 mm. 



Wings with margins entire. F.w. grey or yellowish 

 grey, semi-transparent, marked with fine black lines, 

 two large black spots at costa, and a third near apex, 

 internal to the last a triple red spot as in H. Iielios 



