82 Proceedings of the Biological Society of Washington. 



Diploiulus londinensis (Leach). 



1814. Julus londinensis Leach, Trans. Linn. Soc. London, XI, p. 378. 

 1864. Julus caeruleo-cinctus Wood, Proc. Acad. Sci. Phil., p. 14. 

 Julus hortensis Woodj ibid. 



This is oxir most commonly observed member of the family. It is abun- 

 dant throughout New England and adjoining parts of Canada and over 

 New York State. It occurs westward as far as Indiana and Illinois and 

 southward through Pennsylvania and New Jersey to the District of 

 Columbia, though in these directions becoming less frequent. Particularly 

 during periods of drought, it appears sometimes to attack gourds, potatoes, 

 lettuce and other vegetables and plants, accusations of such action having 

 come not infrequently from different parts of New York State. In England 

 it is said at times to attack the roots of lucerne ; and in Germany occasionally 

 to damage the potato crop. 



Diploiulus luscus (Meinert). 



1868. Julus luscus Meinert, Naturh. Tidsskr., 3 R., V, p. 9. 



1887. Julus owenii Bollman, Entom. Amer., II, p. 228. 



1891. Julus frisius Verhoeff, Berl. Ent. Zeits., XXXVI, Hft. 1, p. 133, 



pi. 6, figs. 17-21. 

 1914. Julus hesperus Chamberlin, Canad. Ent., p. 314. 



This is a small form ranging mostly from 10 mm. to 15 mm. in length. 

 It is found throughout the range indicated for D. londinensis above and 

 occurs as well in the Far West, the writer having taken it at Salt Lake City 

 in Utah and at Santa Barbara and Los Angeles in California. He has also 

 seen specimens from other localities in the latter State sent him for identifi- 

 cation. There seems little doubt that this is the true luscus of Meinert; 

 but if luscus is held to be indeterminable with certainty, then owenii must 

 take precedence over frisius. Comparison of American specimens with 

 some from Holland shows complete agreement in the gonopods of the male. 



Genus Brachyiulus Berlese. 

 Byachyiulus pusillus (Leach). 



1814. Jidus pusillus Leach, Trans. Linn. Soc. London, XI, p. 379. 



1841. Julus exiguus Brandt, Recueil, p. 85. 



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



1875. Julus stuxbergii. Fanzago, Atti d. Soc. Veneto-Trent., IV, p. 150. 



This well-known species is widely distributed in this country, where it 

 has hitherto been listed under Wood's name. It is common in New 

 England and southward to North Carolina; and I have recently received 

 specimens taken at Jackson, Miss. Westward it has been found in Ohio, 

 Indiana and Illinois, and in California (e. g. at Stanford). This species is 

 sometimes placed by European workers in a subgenus Microbrachyiulus; 

 but as it is the type of Brachyiulus any genus or subgenus in which it is 

 included must bear this name. 



