8 Proceedings of the Biological Society of Washington. 



common form differing in wholly lacking caudal horn, in having the 

 segmental striae less numerous, and in being of smaller average size. In 

 the structure of the copulatory organs, however, it seems to be absolutely 

 the same as the tailed form. The ecaudate form is the one occurring so 

 commonly in the United States, where tailed specimens have never been 

 found. In accord with the opinion of European workers who have had 

 opportunity of studying both forms and the manner of their occurrence, 

 the caudate and ecaudate individuals may be regarded tentatively as con- 

 stituting distinct varieties of the species. The ecaudate variety must be 

 designated by Wood's name caeruleocinctus, which has priority as indicated 

 below. 



Diploiulus londinensis caeruleocinctus (Wood). 



1864. Julus caeruleocinctus Wood, Proc. Acad. Sci. Phil., p. 14. 



1864. Julus hortensis Wood, ibid. 



1866. Julus multisiriatus Walsh, Practical Entomologist, 2, p. 34, with 



figure, and p. 70. 



1866. Julus londinensis Porat, Bidr. t. kanned. Sver. Myr., Dipl., p. 28. 



1868. Julus londinensis Meinert, Naturh. Tidsskr., p. 8. 



1869. Julus londinensis Porat, Ofvers. Vet. Akad. Forh., no. 6, p. 647. 

 1876. Julus londinensis Stuxberg, Ofvers. Vet-Akad. Forh., no. 8, p. 893. 

 1891. Julus londinensis Verhoeff, Berlin Ent. Zeitschr., XXXVI, p. 151, 



and in his subsequent writings, under Julus, Cylindroiulus, etc. 



1900. Julus teutonicus Pocock, Ann. Mag. Nat. Hist., p. 206. 



1915. Cylindroiulus londinensis teutonicus Jackson, Lane, and Ches. 

 Nat., p. 433. 



1918. Cylindroiulus londinensis teutonicus H. K. and S. G. Brade-Birks, 

 Lane, and Ches. Nat., p. 115. 



There might be some doubt as to the identity of Wood's caeruleocinctus 

 were we dependent upon his description alone; but, in the first place, speci- 

 mens identified by Wood in the M. C. Z. collection are clearly the ecaudate 

 form of londinensis, and, in the second place, Wood examined specimens of 

 Walsh's multistriatus and declared them indistinguishable from his caeru- 

 leocinctus (Cf. Practical Entomologist, 1866, 2, p. 70). Walsh's description 

 can apply to no other form than the present one and leaves no room for 

 doubt as to the identity of caeruleocinctus. The specimens upon which 

 Wood's original description was based were said to be in bad condition and 

 had probably been dried, under which condition the blue banding which 

 suggested the name commonly comes out more or less conspicuously. 

 The description of hortensis was probably drawn from fresh material. 

 Three names, then, as indicated in the synonymy above, had been applied 

 in America to this ecaudate form of londinensis many years before Pocock 

 proposed the name teutonicus. 



Brachyiulus pusillus (Leach). 



To the synonyms of this species as given in our previous paper (Proc. 

 Biol. Soc. Wash., 1921, XXXIV, p. 82) should be added: 



1898. Brachyiulus littoralis Verhoeff, Arch. Naturg., p. 154, pi. 6, fig. 29. 



