200 THE entomologist's kecord. 



bellarijus seemed just as much out of place. An observation on a <? 

 of this species was interesting from the point of view of suggesting that 

 it was somehow out of its normal habitat here. This 3 , tlying along 

 he road, on being disturbed, made several attempts to fly over the low 

 stone wall into the gorge below, but, on reaching a few inches above 

 the level of the wall, was forced back, apparently by a difference in the 

 pressure of the air on the tvvo sides, although no wind appeared to be 

 blowing, showing, however, that there was a distinct difference on the 

 two sides of the wall, the one exposed to the hot road, the other to a 

 fall of skrees extending hundreds of feet at an angle of something 

 between 60"^ and 75°. At the same time Erebia nerine negotiated 

 without eiibrt this difference of air-pressure (?) that was fatal to A. 

 bellan/iis and Melitaea dictipina when they tried to pass over ; indeed, 

 R. nerine appeared not to recognise the unseen barrier that baffled the 

 other species. A little farther on the rocks fell back again, and the 

 wooded slopes met the road once more. Here, by the edges of the 

 larch wood, a well-marked form of Krehia lii/ea was not at all 

 uncommon, and here, too, Krehia ti/ndanifi and Colias phicoinune 

 commenced to appear. Among the thyme plants Merririehiia tridactyla 

 (tetradactijla) was frequent, and a few ('oenonj/iiiji/ia sati/rin)i were 

 noted, whilst many of the species already recorded re-appeared. Here, 

 again, ^ Ai/riades bellariiua occurred, together with Varciniina optilete, 

 etc. A little farther on a heathy piece of ground was reached on 

 which Erebia ti/ndarits was very abundant, but the sky becoming 

 somewhat cloudy a halt was called. Cleoijene lutearia appeared, and 

 PLusia interroijationis was netted. Without having done anything 

 special, our box was getting pretty full, and it was soon determined to 

 turn back ; nothing fresh was noticed except a rather large example of 

 Melitaea flf/zaZm, flitting along the road in the same way as 3/. dictynna 

 had previously been noted, whilst a number of very characteristic 

 Setina aiirita were taken as they fluttered from the rocks above to the 

 skrees below. A quiet walk back to Zernetz brought us to our hotel, 

 and the setting of our captures commenced. Next morning, August 

 12th, we booked a seat by diligence to iSanta Maria in the Miinster- 

 Thal, and, on one of the most magnificent days of the toar, we picked 

 up, as well as we could from the pace of the diligence, unconsidered 

 trifles, over the whole distance beMveen Zernetz and Santa Maria. 

 On the ground traversed the preceding day we saw no new species, 

 and on the long level beyond to the Ofenburg inn we saw nothing 

 special, except that E. nerine was common the whole way. Indeed, 

 on this occasion, the species was noted all the way up the Of en Pass, 

 being particularly abundant on the slopes at the very summit, and for 

 a few hundred feet below the summit of the Pass on the Buft'alero side. 

 On the slopes just beyond the Ofenburg Inn, two worn ? s, very 

 different in size, of Erebia r/orr/e var. trinpes were taken ; they were 

 exceedingly well -spotted on the upperside, whilst E. nerine was again 

 abundant on the same ground. On the slope by the footpath at the 

 side of the inn, three species of C(dias — C'. phicotiione, C. edii^a, and 

 C. Ityale — were all observed at the same time. Pieris brassicae, too, was 

 observed almost to the summit of the Pass, whilst a solitary Pontia 

 callitlire was seen at some little distance below the summit on the 

 Buttalero side. A large <? Lasiocawpa quercits was observed to rise 

 and fly off in its usual headlong manner in the pinewood just beyond 



