1911] Wheeler — Pseudoscorpions in Ant Nests 167 



harpax, Ideobisium rufulum with Camponotus sansaheanus and Olpi- 

 uin minutum with Eciton cwcum. I have myself not infrequently 

 taken single pseudoscorpions of different species in the nests of 

 various ants, and have received them in vials of ants sent to me 

 for identification, but I have till recently supposed that they were 

 accidental intruders and not myrmecophiles in the proper sense 

 of the word. 



Donisthorpe^ gives the following more precise notes on three 

 species of pseudoscorpions which he found in England: '"Cherries 

 scorpioides, Herm. In May last this species was found in the 

 greatest profusion in F. rvfa nests at Buddon Wood, Leicester- 

 shire. Mr. Wallace Kew, who kindly identified them for me, told 

 me there were males, females, and females carrying eggs exter- 

 nally, present. They occurred in the nests, literally in thousands, 

 especially at the very bottom of the nest. Every handful of the 

 debris of the nests placed on paper was seen to be swarming with 

 the Chelifers. The ants paid no attention to them. It has been 

 recorded with the same ant in Denmark by Hansen. I have taken 

 it sparingly with F. riifa at Weybridge (Ent. Rec, 1907, p. 255), 

 and have intruduced specimens into my observation nests. The 

 ants treated them with indifference. When a F. rufa worker was 

 forced to take hold of a Chelifer, it dropped it at once. I think it 

 is quite clear that this species, at least, cannot be said to have 

 'nothing to do with ants.' Ideoroncus cambridgii, L. Koch. — 

 Several specimens were found in nests of L. flavus at Virtuous 

 Lady Mine, in Devonshire, in April. Chthonius rayi, L. Koch, 

 occurred in a nest of F. riifa in Parkhurst Forest, Isle of Wight, 

 in April. I have taken this common species before with L. fuli- 

 ginosus at Oxshott." 



On January 15, 1811, while collecting at Point Joe, near Pacific 

 Grove, Cal., I came upon many flourishing colonies of Formica 

 subpolita nesting under rough stones in the grass near the sea- 

 beach. In every nest there were great numbers of snow-white 

 root-coccids and root-aphids, several small white Isopods of an 

 undescribed species, apparently related to the European Platyar- 

 thrus hoffmanseggi, and a dozen or more pseudoscorpions. These, 

 which have been kindly identified for me by Mr. H. E. Ewing as 



iQn the Founding of Nests by Ants; and a Few Notes on Myrmecophiles. Ent. Rec. and Journ. Var. XXII, 

 1910. 



