OVER THREE PASSES THE SPLUGEN, STELVIO, AND BRENNER. 95 



like one dividing into two, or two fusing into one, and this in varying 

 degrees. This circumstance in itself shows that variation in the 

 number of antennal joints is actively going on, and deprives number 

 of antennal joints of much of its value as a specific character. 

 I have further measured the longest rods of the segments of the 

 ovipositor and find that here again is a character that varies, but still 

 supplies a distinction between the two species, but not a very strong 

 one. Those of L. feiclmultdla vary from 8-3mm. to 3-6mm. in length, 

 those of L. lajiifhila from 3-8mm. to 4-3mm. The example with the 

 shortest rods I have measured is that "calling" specimen from 

 Lurgashall, 3"3mm., a parthenogenetic sister from the same locality is 

 3-4mm. The L. hipid/lUi with the longest rods, 4-3mm., is a Guernsey 

 specimen. 



I may sum up the results of last season's investigations as 

 follov.s : — (1) A form of L. fcnliaultdla occurs along the rocks of 

 the shore at Cannes that is unquestionably parthenogenetic, but has 

 oviposition rods of 3*6mm. long (shortest L. lajiiddla 3"8mm.) and has 4- 

 jointed tarsi (4'4*4). Milliere reports L. lapiddla as occurring in the 

 hills inland, and at 1000ft. or 2000ft. elevation, but not at Cannes ; he 

 knew nothing of L. fenhaultdla. (2) A form of Jj. fcirhanltella occurs 

 at Lurgashall (Sussex), that has a tarsal formula of (4*4-4) and that 

 occasionally calls, this is perhaps the most interesting of the results 

 obtained. L. lapiddla occurs on Dorset coast, but on the south coast 

 and at all other English stations except Lurgashall, so far examined, 

 L. fcrchaidtdla has a tarsal formula varying from 3-4-4 to 3'3'3, and is 

 not known to call. (3) Within a dozen miles of the habitat of L. 

 iiiai/iiidla {H■6^nln.. oviposition rods) L. lapiddla and L. fcivhaidtdla (or 

 just possibly L.iiiai/nidla) occur together on the same ground. 



None of these facts goes to show that all these forms are one and the 

 same species, but they do show that L. ferclundtdla has in different 

 localities made very different amounts of progress in differentiating itself 

 from 7>. lapiddla. The absence of crossing makes it quite reasonable to 

 make each of these forms different species, if it were worth while to do 

 so, whilst on the other hand one can hardly help thinking that these 

 " calling " specimens from Lurgashall might easily have been crossed 

 with L. lapiddla, and possibly absorbed into that species. 



[Tii he continued.) 



Over Three Passes — the Splugen, the Stelvio, and the Brenner — 

 with some notes on the Butterflies by the way. 



By H. ROWLAND BROWN, M.A., F.E.S. 

 {Conduded from vol. xii., p. 312.) 



On July 18th my visit to Trafoi came to an end, and I took the 

 stellwagon for another long drive to Meran. After leaving Spondinig 

 the road skirts a wild, burnt-up-looking range of hills for some 

 distance, bare, for the most part, of vegetation, but with occasional 

 patches of thistle bloom and red Coitaitrca. The Sati/iidi were in 

 great force here — Sati/nis licvniionc, with S. hrisris and 6'. statiliiuis, 

 but the road was flat, and the pace of the " omnibus " left no oppor- 

 tunity for a descent. Passing a night at J3otzen, I joined Mr. A. H. 

 •Tones on the 19th at Cortina, but here once more the luck deserted 

 me, and the Ampezzo Thai will rank as one of the most disappointing 



