NOTHRUS HORRIDUS. 505 



species, N. hicarinatus, where they are much less con- 

 spicuous, nor can I see any on his specimens. I 

 might miss them as the specimens are not cleaned, 

 but in my specimens they spring from rather strong, 

 chitinous apophyses, which would not be so likely to 

 be missed, and which are not drawn nor mentioned, 

 nor can I see them. Then, Berlese draws a second 

 longitudinal carination on the notogaster, which my 

 specimens do not possess, and his smaller transverse 

 carinations are much more regular than in my speci- 

 mens ; the abdomen in his drawing is longer and nar- 

 rower in proportion, and there are a few other trifling 

 differences. 



The Nothrus liorridus of Nicolet is distinguished by 

 having two long, diverging setiform hairs springing 

 from each of the apophyses which form the outer 

 angles of the central projection below the hind margin. 

 Hermann does not draw or mention these ; he may have 

 missed them, but probably would not have done so if 

 they were as conspicuous as Nicolet figures them ; it 

 was perfectly natural that Nicolet, who only knew of 

 one form that could be supposed to be Hermann's N. 

 liorridus^ should identify it with that species. Berlese 

 ('Acari, &c. Ital.,' Notes, fasc. iii, p. 6) states that 

 he has found specimens agreeing exactly with Nicolet's 

 drawing, and he figures this species as N. liorridus in 

 the same work (fasc. xvii) ; it shows the two hairs 

 on each of the above-named apophyses, but the 

 apophyses themselves and a few other particulars seem 

 rather different from Nicolet's. Berlese, in his book, 

 states his N. horridus to be more than one-third longer 

 than his N. angulatus, and this larger size agrees 

 exactly with Nicolet; but the specimens which Pro- 

 fessor Berlese sent me as his N. horridus and his i\^. 

 angulatus^ are the same size (unfortunately the hairs are 

 gone from the hind margin of the former). I have not 

 ever seen in England any specimen with the two hairs 

 from each of the central hind apophyses nor with hairs 

 of the size or form figured by the French and Italian 



