Entomology in N.W. Spain. 151 
bearing towards us of the inhabitants was always an 
indisputable item in the enjoyment of our excursions in 
Spain, we decided to move on at once, proceeding to 
Casayo. 
El Barco is on the river Sil, and some five miles above 
the town (or village), some way beyond Sobradelo, the 
Casayo Valley opens to the south. Casayo is the highest 
village in the valley at an elevation approaching 4,000 feet. 
Its position is approximately 42° 16’ N., 6° 44’ W. We 
hoped to obtain fair quarters here, but on arrival were 
disappointed to find that the elevation was less than we 
had hoped, and that the promised accommodation was 
absolutely impossible. After for some time seriously con- 
sidering an immediate retreat, we finally discovered that 
the schoolroom of the village was for the time unused and 
at our service. It was infinitely rough and dirty, and 
none too large, but we could have it to ourselves, the 
neighbouring farmer’s wife could find us clean bedding 
aud cater for us, and it possessed a practicable balcony. 
So here we stayed for a week, and have been less 
comfortable under more conventional conditions. 
The different, branches of the Casayo valley presented 
considerable variety of conditions, generally steep and 
rocky slopes, clad with heath, Cistus, Cytisus, and often 
patches of scrub oak, and in one or two places moister 
wooded slopes. The roughness and steepness of the 
country rendered excursions to any distance impossible, 
except where there were regular tracks. One of these 
leading across a high plateau towards La Baiia passed the 
habitat of Lycena idas. Lycena argus, var. casaiacus, 
occurred everywhere, but commonly only along another 
road leading up the main valley, a little further up which 
at about 4,000 feet Hrebia palarica was not infrequent, 
but quite passée. There were other spots in view, but 
practically inaccessible, that we should like to have visited; 
the varied character of some of these makes it probable 
that not a few species as unexpected as L. idas may be 
found in this region by more enterprising explorers than 
we were. 
On our way back we stayed a day or two at Tuy and 
made an excursion to Valenca, on the Portuguese side of 
the Mifio. Then we went northwards to Pontevedra, 
and visited Santiago de Compostela. From Valenca to 
Pontevedra the country is very similar to that about Vigo, 
