432 Mr. J. W. Shoebotham's Notes on CoUemboIa. 



Genus SiRA, Lbk., mihi. 



Seira, Lubbock (1870), p. 279. 

 = Pse»dosira, Schott. 



Denies ventrally covered with scales. 

 Type. S. domestica (Nic). 



Genus Willowsia, gen. nov. 



Denies ventrally only with ciliated hairs, without scales. 

 Type. W. {Seira) nigromaculata (Lbk.). 



List of Genera of Collembola found in the British Isles. 



Class INSECTA. 



Subclass Apterygota, Oudns. 



Ovder COLLEMBOLA, Lbk. 



Suborder ARTHROPLEONA, C. B, 



Section PODUEOMORPHA, C. B, 



I. Faniily, Poduriaae (C. B.). 



1. Genus Poduea, Linn., Tbg.. 



II. Family Hypogastruridae (C. B.). 



Subfamily Hypogastbubin^, C. B. 



2. Genus Hypogastruea, Bourl., C. B, 



3. Genus Xenylla, Tbg. 



4. Genus Willemia, C. B. 



6. Genus ? 



A genus comes here related to both Hypognstriira 

 and Xenylla. I have an English species in my 

 collection, which in many respects is intermediate 

 between these two genera, but so far I have not 

 described it. Possibly it is BeckereUa, Linnaniemi. 



Subfamily ACHOBUTINJR, C. B. 



Tribe Pseudachobutini, C. B. 



6. Genus Pseijdachorutes, Tbg. 



7. Genus Micbanurida, C. B. 



8. Genus Anubida, Laboulb. 



9. Genus Friesea, D. T. 



