Yorkshire Naturalists at Riccall. 177 



been fired. This reptile was persuaded to pose for photo- 

 graphic purposes, with the result shewn by the accompanying 

 picture. 



CoNCHOLOGY. — Mr, J. F. Musham, F.E.S., writes : — Owing 

 to the drought, and the sandy nature of the ground investigated, 

 a careful search of the common resulted in almost a blank. 



Thanks to the energy of Mr. W. Cash, however, this was 

 partially redeemed later in the day, by securing four aquatic 

 species in a pool near the village ; the remaining members 

 being equally fortunate, on visiting the banks of the Ouse, the 

 other side of Riccall, in further adding fourteen terrestrial 

 species ; the day's results being as follows : — Arion ater var. 

 castanea, Arion minimns, Limax maximns var. jasciata, Hyalinia 

 cellaria, H. nitidula, H. alliaria (a fine colony taken in the 

 churchyard), H. pur a var. nitidosa, Vitrina pelhicida, Zua 

 luhrica, Hygromia hispida, Pyramidula rotundata. Helix ne- 

 moralis, H. arhustorum, H. cantiana, Limncea peregra, Sphcer- 

 ium corneum, Valvata piscinalis, Pisidium suhtrtmcatiim, and 

 Succinea putris. 



Trichoptera. — A Trichopteron, obtained by Mr. Wattam 

 in one of the pine woods, has been determined by Mr. G. T. 

 Porritt as Limnophilus auricula. 



Arachnida. — Mr. Wm. Falconer writes : — More members 

 of the Arachnida Committee attended the meeting than is 

 usually the case, yet as very close search is necessary to procure 

 spiders, only a limited area of the common could be investigated, 

 but this was intentionally a portion which had not before been 

 worked for arachnids, the route selected traversing the first 

 wood, the open damp ground beyond, and the wood beyond 

 the second guide post. Dry conditions favoured collecting, 

 seventy-nine species of spiders, two of harvestmen, and one 

 pseudoscorpion, being met with. Twenty-four of these had 

 not previously been recorded for the common ; most were 

 common and widely distributed spiders, but the rest furnish 

 valuable additional records for the county list, viz. : — 



Argyroneta aquatica Latr. Line Ponds, two $s, Dr. Ford- 

 ham, who had known of its presence .there for some time. 



Crustulina guttata Wid. Two $s, from heather bordering 

 road at the second wood. A southern species, though twice 

 noted previously in the East Riding. 



Entelecara thorellii Westr. An adult pair. T. Stainforth. 

 One $ previously taken in North Riding. A rare spider also 

 elsewhere. 



E. acuminata Wid. 3 (^s, 3 ^s, the latter not adult, from 

 heather roots. 



Tapinocyba pallens Cambr. 3 (^s, 2 $s, from the woods. 

 Omnes. 



igi2 June i. 



