TITANOSOMA AND POLYMICRODON IN ENGLAND 1 59 



I would here refer to my determinations regarding the 

 development of the antennae in the Dermaptera, 1 which in 

 comparison with the Diplopods present us with features both 

 of agreement and difference. The antenna? of the Dermaptera 

 behave differently in that the peduncle, and also the basal 

 joint of the flagellum, possess their final form from the 

 beginning, and the peduncle stands in strong contrast in 

 structure and function to the rest of the antenna. The 

 development is also different in the fact that the original third 

 joint (the second of the flagellum) alone undergoes further 

 division. There is agreement, however, in regard to the zone 

 in which growth takes place, since in these insects also it 

 must be described as post-basal. 



The post-basal growth of the antennae is in complete 

 contrast with the growth of vegetable shoots. For whilst in 

 the latter we find the youngest portion (the vegetating-point) 

 at the end, and the older parts lower down, in the antennas of 

 the Diplopods and Dermaptera the oldest joints occur for the 

 most part at the point, and the younger joints insert them- 

 selves between the base and the middle. This process of 

 growth of the antennae is also interesting in that it is analogous 

 with the method of increase in the number of the abdominal 

 segments, for the most recent of the segments formed from 

 the budding zone insert themselves between the telson and 

 the rest of the body. 



Polymicrodon latzeli Verh. 



In 189 1, when I was a student, in my "Beitragzur mitteleuro- 

 paischen Diplopodenfauna," 2 I described amongst others, on 

 page 127, an " Atractosoma" latzeli from the South of England 

 (probably from the neighbourhood of London), of which I 



1 See Nova Acta der deutschen Academie der Naturforscher, Halle, 

 1904, pp. 16-20, in my paper " Ueber vergleich. Morphologie des Kopfes 

 niederer Insecten, mit besonderer Beriicksichtigung der Dermapteren und 

 Thysanuren, nebst biologisch-physiologischen Beitragen." 



2 Berlin, entomol. Zeitschr., 1S91, H. 1, pp. 115-166. 



