Physiology gf Hsematopinns tenuirostris, Burm 75 



Graber (26) ; but all these have treated only of the lice 

 parasitic upon man. 



With the purpose of filling up this gap in our literature, 

 which, with the lapse of time, is becoming very sensible, and 

 at the suggestion of my honoured teacher, Prof. H. Landois, 

 I made the internal anatomy of the Pediculina, and especially 

 of those which live upon our domestic mammals, the objects 

 of a special study ; and in the present work I communicate the 

 results which have come from my investigations on the Hcema- 

 topinus tenuirostris, Burm., parasitic on Bos taurus. 



But before I proceed to the exposition of these, I may be 

 permitted to preface them with something upon the history of 

 this louse. 



Historical. 



We know at present three Pfediculina which live upon the 

 domestic ox (Bos taurus, Linn.) — namely, Trichodeetes scalaris , 

 Nitzsch, Hcematopinus eurysternus, Nitzsch, and H. tenui- 

 rostris, Burm. Whilst authors agree in the description of 

 the first two species, singularly enough the existence of the 

 last-named species has had doubt cast upon it by Piaget. In 

 his great work he says *, " Since Linne, authors speak of a 

 second species of Hcematopinus likewise living upon Bos 

 taurus. Notwithstanding my researches, I have not succeeded 

 in meeting with this species, and some doubts have arisen in- 

 voluntarily in my mind." In support of his doubts he relies 

 upon the defective descriptions and the inaccurate figures of 

 different authors. 



As regards the father of scientific classification, Linne, 

 in the first place, he cites two species as living upon Bos 



taurus : — 



u 1. Pediculus Tauri Bovis : abdomine lineis transversis 



octo ferrugineis. 



" Suecis Koe-luus. 



" Habitat in Vaccis ; haec minor est species, datur et altera, 



quse major et insequens. 



u Descr. Totus albus, minimus. Caput testaceum. Pedes 

 testacei, apice albidiores. Abdomen album, lineis octo testa- 

 ceis transversis in dorso ; quinque fasciis transversis in ventre ; 

 quse omnes lineae non tangunt marginem seu latera ; latera 

 tamen obscuriora reliquo corpore sive punctis octo ferrugineis 

 notata " 



This is undoubtedly, and according to the concurrent opinions 

 of authors, our present Trichodectes scalaris, N. 



* Loe. cit p. 660. 



6* 



