32 MONOGRAPHIA 



obscurely defined, anteriorly and posteriorly notched; 

 abdomen very long, sub-cylindrical, grayish white, segments 

 well defined, the 2nd to the 7th with two rows of oblong, 

 fuscus, horny excrescences encircling the spiraculae ; sutures 

 hairy, the terminal one with a triangular black spot on each 

 side the apex ; legs very thick ; tibia short, with a large 

 obtuse apical tooth; tarsus short, conical; ungues very thick 

 and obtuse. Length 1 to 1. 



The only two examples of this species which I have 

 examined were kindly forwarded to me by Rev. L. Jenyns, 

 who found them upon a calf. Mr. J. named them Vituli, 

 and I have no doubt they are the species so named by 

 Linnaeus and Fabricius. It may appear somewhat strange 

 that a young animal should have a .distinct species of 

 parasite, which is not found upon its parents ; but, as far as 

 we are able to judge, such is the fact. I have examined 

 numbers of the lice from oxen, but never detected a single 

 specimen of this species amongst them, though there were 

 of Trichodectes Scalar is, which lives upon cattle, and in 

 society with the H. Eurysternus. In describing and 

 figuring this species, I have doubts as to *my accuracy, 

 in consequence of all specimens of Pediculi (proper) alter- 

 ing colour and form after death ; and as 1 have never seen 

 this insect alive, I will not vouch for the exactness of either 

 of these points. 



9. H^MATOPINUS ASINI. (Louse of the Ass.) 



Plate XXV. Fig. 1. 



Ferruginous ; abdomen large, light tawny- yellow white, 

 with horny excrescences on each side, surrounding the 

 spiraculae ; head very long, deeply sinuated behind the 

 antennae. 



