10 Arachn. 
XL Arachnida. 
II.— SUBJECT-INDEX. 
N.B. — The number in Clarendon when not 
that of a Volume, refers to the list of 
Titles. 
GENERAL, ECONOMICS. 3003 
Economics (see also Parasitism). 
Harvest mites (Trombid.) ; Chitten- 
den, 8 : Tick-resistance in cattle ; 
Johnston & Bancroft, 42 : Ixodidae, 
Wales ; Walton, 67 : Acari on poultry: 
Bishopp & Wood, 4. 
Phytophagous Acari : Tetranychus 
on Cotton ; McGregor, 44 : Cyclamen 
mite ( Tarsonemus) ; Moznette, 45 : 
Eriophyes on Norway maple ; Enders, 
14 : Eriophyidae ; Quaintance, 52. 
STRUCTURE. 3007- 
General. 
Demodicidae ; Hirst, 32. 
Special. 
“ Gland ula plicata,” Scorpiones ; 
Pawlowsky, 48. 
PHYSIOLOGY. 3011. 
Reactions to light, Pedipalpi ; 
Patten, 47. 
Intracellular digestion, Liponyssus 
(Acari) ; Reichenow, 55. 
DEVELOPMENT. 3015. 
(Vacant.) 
ETHOLOGY. 3019. 
General. 
Theridion ; Ewing, 18 : Ambly- 
omma (Ixod.) ; Dunn, 13. 
Breeding Habits, etc. 
Theridion ; Ewing, 18. 
Web and cocoon, Theridion ; Ewing, 
18. 
Habitats. 
Marsh-dwelling Hydrachnidae, Pheno- 
logy, otc. ; Haeberli, 28. 
Cavemicolous Araneae , Acari ; 
Schmitz & Bequaert, 59. 
[1918] 
Parasitism and Symbiosis (see also 
Economics). 
On Mammals, Demodicidae ; Hirst, 
33 ; Ixodidae, Sarcoptidae ; Torreg- 
giani, 63 : Sarcoptidae ; Trouessart, 
64. 
On Birds. Endoparasitic mites in 
pigeon ; Johnston, 41. 
On Reptiles, Ixodidae ; Dunn, 13. 
Plant Galls, seo Eriophyidae. 
Hymenoptera paras, on Araneae ; 
Rudow, 57. 
Miscellaneous. 
Vegetarian feeding of Liobunum 
(Opil.) ; Wickham Ent. News Phila- 
delphia 29 1918 p. 115. 
Web of Cyrtophora ; Phelps, 49 : 
of Epeira ; Pillichody, 50. 
Mimicry in Spider ; Clayton Bombay 
J. Nat. Hist. Soc. 26 1918 p. 302. 
Ant-like Spiders ; Badcock, 1. 
VARIATION AND AETIOLOGY. 
3023. 
Origin, Demodicidae ; Hirst, 32. 
Teratology. Bicaudate Centrums 
margaritatus ( Scorp .) ; Campos, 7 
Gynandry in Araneae ; Hull, 36. 
DISTRIBUTION. 
Geographical. 3027. 
General. 
(Vacant.) 
Europe and Mediterranean 
Islands. d 
Faroe Ids., Hydiachnidae ; Viets, 65. 
Belgium, Araneae, J^cari ; Schmitz 
et Bequaert, 59. 
Scotland, Bass rock, Araneae ; Evans 
Scot. Nat. 1918 p. 264. 
England, Acari ; Hull, 37.: N. 
England, Acari ; Hull, 38 : Yorkshire, 
Araneae ; Falconer, 20 : North York- 
shire, Araneae ; Harrison, 29 : Lancs, 
and Cheshire, Araneae, Opiliones, 
Pseudoscorpiones, Acari ; Falconer, 
21 : Pseudoscorpiones ; Standen, 62 : 
