432 Mr. J. W. Slioebotliara's Notes on CoUemhola. 



Genus Sira, Lbk., mihi. 



Seira, Lubbock (1870), p. 279. 

 = Pseudosira, Schott. 



Denies ventrally covered with scales. 

 Type. S. domestica (Nic.) . 



Genus Willowsia, gen. nov. 



Dentes ventrally only with ciliated hairs, without scales. 

 Type. IV. {Seira) niyromacvlata (Lbk.). 



List of Genera of CoUemboIa found in the British Isles. 



Class INSECTA. 



Subclass Apterygota, Oudns. 



Order COLLEMBOLA, Lbk. 



Suborder ARTHROPLEONA, C. B. 



Section PODUROMORPHA. C. B. 



1. Family Poduridae (C. B.). 



1. Genus PoDrnA, Linn., Tbg, 



II. Family H3rpogastruridaB (C. B.). 



Subfamily HypoGASTRUBiN^, C. B, 



2. Genus Hypogastruba, Boiirl., C. B, 



3. Genus Xenylla, Tbg. 



4. Genus Willemia, 0. B. 



5. Genus ? 



A genus comes here related to both Hypognstrura 

 and Ximylla. I have an English species in my 

 collection, which in many respects is intermediate 

 between these two genera, but so far 1 have not 

 described it. Possibly it is Beckerella, Liunaniemi. 



Subfamily Achorvthssjr, C. B. 



Tribe Pseudachorutini, C, B. 



6. Genus Pseudachorutes, Tbg. 



7. Genus Micranurtda, 0. B, 



8. Genus Antjrida, Laboulb. 



9. Genus Friesea, D. T. 



