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Transactions of the Society. 
paper. Berlese’s figure shows a female with a genital plate pointed 
anteriorly. In 1885 Canestrini ( loc . cit.) described a creature under 
the name of Celseno inermis, which is evidently intended to be the 
same as Berlese's, Koch’s Sejus inermis being again referred to ; 
Canestrini, however, described the genital plate of the female as 
rounded anteriorly, and as coming rather farther forward than Berlese 
draws it ; in other respects it seems very similar to Berlese’s species ; 
if they be not identical then the name of “ inermis ” clearly belongs 
to Berlese’s species and not to Canestrini’s. The genus Celseno can- 
not stand any more than Trachynotus, having also been previously 
used (before Koch) as above explained. In 1886 Kramer (loc. cit.) 
described a species which he considered new ; he founded the genus 
Dinychus for it ; his figures and description are not very perfect, and 
he did not find the female, so that the shape of the genital plate can- 
not be traced. In his later work * Berlese adopts Kramer’s genus 
and calls his species Dinychus inermis ; he gives more careful figures 
which show the whole creature more parallel-sided and broader pos- 
teriorly than Kramer’s drawing ; two strong spines on the first joint 
of the palpus in Kramer’s species are apparently absent in Berlese’s. 
The English specimens which I have hitherto found are all of one 
species, which agrees in form rather with Kramer’s species than 
Berlese’s ; Canestrini’s description of the form also seems more like 
Kramer’s; the English specimens have the genital plate of the female 
quite rounded anteriorly without any sign of a point; the plate 
extends far forward as Canestrini describes, and fills up almost the 
whole sternal space from near the front of the coxae of the second legs 
to the middle of the coxae of the fourth legs. As the shape of the 
genital plate of the female is an important matter in identifying 
Uropodinae, I think that the species of Kramer, Canestrini, and my 
own are probably identical, and I have therefore called it “ Dinychus 
perforatus Kr.,” and I imagine Berlese’s to be a different species ; if 
they should ever turn out to be the same then the name of “ inermis ” 
should stand. 
I have found the species widely distributed, but rare, in England. 
I have also found it at Loch Maree in Scotland. 
Uroseius acuminatus Koch. 
Uropoda acuminata Koch, ‘ Kritische Revision der Insectfauna Deutsch- 
lands,’ Bd. iii. 1847, p. 260, pi. 10, fig. 110, 
Uroseius „ Berlese, ‘ Acari &c. ital.,’ fasc. lix. Nos. 3 & 4. 
Uropoda elongata Haller, “ Acarinologisches,” Archiv fur Naturges., 
1881, p. 186, Nymph. 
Three or four specimens of this creature in the nymphal stage 
were found by Mr. Newstead in a wild-bees’ nest at Colwyn Bay, 
AY ales. 
* ‘ Acari &c. Ital. 1 
