On the Thorax in Anoplura and in Nesiotinus. 171 



found accompanying an adult male, and there is some doubt 

 whether it really is the female of W. capilo. However, 

 until more evidence is forthcoming, it is best considered as 

 such. 



Cornicularia harpinshuj Camb. 



Cornicularia pavitcms, Cainb., List of British & Irish Spiders, 1900. 

 Neriene pavitans, Camb., Trans. Linn. Soc. Lond., vol. xxviii., 1873, 

 p. 543, pi. xlvi., tig-. 13. 



Cornicularia pavitans, of which the ty))e is a female, is a 

 very strilcing species, and is identical witli C. karpinskii, 

 which has priority. Mr. Cambridge will shortly publish a 

 note on this subject, which I will not anticipate. I obtained 

 a pair of C. karpinskii on Helvellyn on August 28th, 1900. 

 They were taken together under one stone, and the association 

 of the male with the female is thus established. 



XII. — JVote on the Thorax in Anoplura and in the Genus 

 JMesiotiuus of the Mallophaga. J3y EkucE F. CUMMIiNUS 

 (British Museum of Natural History). 



(Published by permission of the Trustees of the Biitisli Museum.) 



Thorax in Anoplura. 



The three segments of the thorax are fused together *. On 

 the dorsal surlace in most species may be seen certain trans- 

 verse bars or rafters of thick chitin, which serve to support 

 the thoracic nota, to provide on the extreme lateral margin a 

 point for the attachment of the coxse on each side, and may 

 roughly represent the original delimiting lines between pro-, 

 meso-, and metanotuin. No epimeral or episternal pieces 

 can be traced at the sides. The fused thoracic notuni tits 

 down as a kind of " lid " upon the sternal surface, which 

 shows no sign of segmentation at all, and in many species 

 carries a single sternal plate of various sizes and shapes. 



These notal rafters — or, if we use the cautious phraseology 

 of the systematist, " bauds " — are important elements in the 

 exoskeleton, and are frequently made use of by descriptive 

 writers, and certainly afford useful, if superficial, characters. 



The Anopluian thorax to tiie comparative anatomist is of 



* My friend Mr. Harrison points out that the prolhorax is distinct in 

 HiematumyzKs, which 1 have not seoa. 



