Yorkshire Naturalists at Bingley. 231 
fashion, the colouring showing up very blue among the dull dark 
heather. 
Mollusca (F. Booth) : — Perhaps the most interesting find was that 
of Paludestvina jenkinsi in a small tributary of Harden Beck and also 
in a pond at Wood Bank, by Mr. Greevz Fysher. This species is rapidly 
extending its range in Great Britain, but as yet its mode of distribution 
remains unknown. Limnaea pevegev occurred in the Beckfoot millpond, 
and the boggy ground at Marley yielded L. truncatula, Hyalinia alliaria, 
H. vadiatula, Limax laevis and Avion minimus. 
Arachnid a (W. Falconer) — -The two arachnologists present at the 
meeting, starting much earlier than the main body, traversed the whole 
route planned out in the circular, and sampled the most promising 
localities on the way. Spiders were by no means plentiful, and many 
were immature. Two species, not of common occurrence, but sometimes 
a'bundant where found, Theonoe minutissima Camb. 1 $>, and Centromerus 
avcanus Camb., several of the same sex, the male of which is one of the 
few among its order larger than its mate ; both at Goitstock. The rest,, 
more generally diffused in suitable situations, are only of interest as 
definite records for the district. Three kinds of wolf spiders were seen 
among the grass in various places, Lycosa pullata Clerck., the most 
abundant, L. amentata Clerck., and L. palustris Linn., the last by the 
dam at Beckfoot. Not a single harvestman was met with ; but the 
false scorpion, Obisium muscorum Leach, was noted throughout the route. 
Mites were not specially looked for, and only a few common kinds were 
taken at Goitstock and St. Ives, viz., Rittevia memorum Koch., Gamasus 
crassipes Linn., G. cornutus ; at Goitstock and Heather Glen, Linopodes 
motatorius Linn. ; at Goitstock, Oppia bipilis Herm. and Damaeus clavipes 
Herm. The most interesting species was the one attached to the under- 
side of a burying beetle. It was not submitted for examination and the 
name cannot be given, as there are more than one species with this habit. 
They are not parasitic in this position, that is, feeding at the expense 
and to the detriment of their host, in that case they would remain fixed 
in one position, pierce through the chitinous armour of the insect, and 
suck its juices, and not merely hold on, as they do, by its hairs. In this 
way they secure dissemination, but the companionship has now come 
to be regarded as mutually helpful, the mites at times scattering over 
the beetle's body, and eating up the unsavoury particles with which, 
from its habit, it becomes soiled, thus keeping it clean. List of spiders 
not previously named (Localities — 1 =St. Ives Wood ; 2 = Heather Glen ; 
3= Goitstock) — 
Clubiona terrestris Westr., both 
sexes, 1 . 
Cvyphoeca silvicola C.L.K., 3. 
Pholcomma gibbum Westr., 3. 
Linyphia clathvata Sund., $, 3. 
Leptyphantes zimmevmannii 
Bertk., 3. 
Povvhomma montanum Jacks., $, 3. 
Rhabdoria diluta Cb., 3. 
Erigone dentipalpis Wid., <$, 1. 
Covniculavia cuspidata B.I., 2. 
Epeira diademata Clerck., 2. 
Meta mevianae Scop., 2, 3. 
Amauvobius fenestralis Stroem., 3. 
Coelotes atropos Walck., 1. 
Robevtus lividus Bl., 3. 
Linyphia peltata Wid., 1, 2, 3. 
Labulla thoracica Wid., 3. 
Poeciloneta globosa Wid., 1, 2, 3. 
Macrargus vufus Wid., 1. 
Maso sundevallii Westr., 3. 
Diplocephalus fuscipes Bl., 1. 
Nesticus cellulanus Clerck., 3. 
Meta segmentata Clerck., 2. 
Neon veticulatus Bl., 3. 
Diptera (Chris. A. Cheetham) : — Diptera were represented by few 
species, and only the dung fly, Scatophaga stevcovavia L., occurred in any 
quantity. Two species of Bibios (B . johannis L. and B. lanigev Mg.) 
were taken, and others included Platychirus albimanus F., Bovbovus 
equinus Fin., Sepsis cynipsea L., with undetermined species of 
Chironomidae, Psychodidae and Phoridae. Two species of Chloropidae, 
1922 July 1 
