Falcone f : Abnormality in Spiders. 203 



has an irregular false articulation (fig. 8). The palpal organs 

 are also somewhat abnormal in structure, but the differences 

 may best be seen by a comparison of the figures given (3 and 7). 

 The epigyne (fig. 6) is imperfectly formed, but all the details 

 may be distinctly traced (compare with that of normal specimen 

 fig. 2). [To be continued). 



CRUSTACEA. 

 Platyarthrus hoffmannseggii, in Yorkshire. — On the 



visit of the Leeds Conchological Club to South Milford on April 

 9th, several ants' nests were examined in a disused quarry near 

 Monk Friston, and in three of them, which belonged to the 

 Yellow Ant, [Formica flava) was found the crustacean Platyar- 

 thrus hoffmannseggii fairly numerous. I also turned over a 

 stone in the same quarry, where I found no indication of ants 

 at the time ; the nearest nest being over two yards away. Under 

 this stone I found eight specimens of P. hoffmannseggii. I 

 have also found specimens in the nest of the same species of 

 ant on Adel ]\Ioor, near Leeds. — ^^'. Harrison Hi'ttox, Leeds. 



— : o : — 

 COLEOPTERA. 



Quedius obliteratus Er., and Homalium septentrionis 

 Thorns, in Yorkshire. — \\'hen on a visit to Knaresborough last 

 month I took a single specimen of Quedius obliteratus Er. 

 among dead leaves. This is the suturalis Kies of the older 

 British collections, and as such is recorded by Bold as rare in 

 Northumberland and Durham. Beare and Donisthorpe in 

 their catalogue of British Coleoptera include the two species 

 thus separated, but obliteratus Er. is the insect of our collections. 



I have been much interested in detecting amongst some old 

 specimens of Homalia. one which is referable to H. septen- 

 trionis Thoms. I found this rare North British insect in decay- 

 ing fish used to attract beetles at Saltburn Wood in July 1894. 



Another beetle which appears to be new to Yorkshire is 

 Homalota ceneicollis Sharp, which I find was taken under bark 

 at Saltburn in 189b. It is closely allied to the common H. 

 xanthoptera Steph, and will probably be met with in other 

 parts of the county when this difficult genus comes to be more 

 closely studied. 



It is to Mr. W. E. Sharp of London, I am indebted for assis- 

 tance in establishing the identity of these insects. — !\L Lawsox 

 Thompson, Middlesbrough, April 19th, 1910. 



1910 May I. 



