286 The Distribution of Spiders in the East Riding. 
peculiar to this area alone. The following are species found 
up to the present only on the Wolds, but several of these are 
certain to be found in one or the other of the remaining 
districts :—Clubiona terrestris, Chiracanthium carnifex, Any- 
phena accentuata, Coelotes atropos, Antistea elegans, Hahnia 
helveola, Mengea scopigera, Dicymbium tibiale, Neriene rubella, 
Styloctetor penicillatus, Prosopotheca incisa, Pachygnatha listeri 
and Heliophanus cwpreus. 
(7) DERWENTLAND.—This is perhaps the richest district in 
insect and spider life that still remains to us in East Yorkshire. 
There are many large areas which have not been cultivated 
and hence still retain their primeval fauna. Such localities 
are Riccall, Skipwith and Allerthorpe Commons, Hotham 
‘Carrs, Houghton Moor and Woods, all of them scenes of past 
excursions of the Yorkshire Naturalists’ Union. The spider 
fauna is very rich, the following being the species recorded for 
this area alone :—Prosthesima petiverit, Clubiona triwvialis, 
Zora maculata, Scotina gracilipes, Dictyna latens, Hahnia 
nava, H. montana, Theridion impressum, T. bimaculatum, 
Crustulina guttata, Enoplognatha thoracica, Floronia frenata, 
Hillhousia misera, L. mengit, Oreonetides firmus, Entelecara 
thorelli1, Cnephalocotes elegans, Tapinocyba pallens, Cercidia 
prominens, Pisaura nurabilis, Lycosa nigriceps, Evarcha falcata, 
and the Harvestman, Megabunus insignis. 
This characteristic species for this district are Zora maculata, 
Crustulina guttata and Evarcha falcata. 
(8) DERWENT Carrs.—The eighth of the areas into which 
the East Riding has been divided is the least satisfactory, as 
it has received but scant attention on the part of arachnidists. 
It includes the low lands to the north and north-west of the 
Wolds, and drained by the Hertford and Derwent rivers. 
Mr. W. Falconer has fortunately done some collecting at 
Scampston and Rillington and last year I paid a visit to the 
Derwent near Binnington. The only spider recorded for this 
area and not elsewhere in the Riding is Leptyphantes alacris 
(terricola). 
The following is a complete list of the known spiders of the 
East Riding, the distribution of each being indicated by a 
cross in one or more of the eight areas into which the Riding 
has been divided. 
For assistance in identification I am greatly indebted to 
Mr. W. Falconer, without whose courteous aid this list would 
have been almost impossible. 
All the species referred to are to be seen in the collection 
of Yorkshire Arachnida in the Hull Museum. 
(To be continued). 

Naturalist, 
