KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 15. N:0 7. 7 



That these species, however, are very nearly related and perhaps originated from 

 the same ancestor may be presumed from their close resemblance and from the varia- 

 tions of less typieal specimens. For instance, some of the specimens of A. Norden- 

 skiöldii show on the 21 th segment a slight swelling, which easily might be mistaken 

 for a tuberculum pubertatis. Other characteristics, however, have always sufficed to 

 distinguish both species from each other, their general appearance being also very different. 



For the sake of comparison I will give here a short description of 



Allolobophora foetida. 



Corpus elongatum, cylindrioum, antice attenuatum. 



Lobus cephalicus minimus, pallitlus, postice tenuis, dimidiam partem segmenti buocalis occupans, sulco 

 rondio transverso, interdum inconspicuo. 



Cingulum non prominens, p. sex 1. septem segmentis confectum. 



Tubercula pubertatis tria in segmentis 27, 28, 29. 



Setse ubique binse, valde approximatse; pars anterior setarum punctis minimis incisa. 



Segmenta eircieiter 90. 



Longitudo ad 80 millimeter. 



Allolob. foetida has a very wide geographical distribution, ranging not only över the largest part of 

 Europé but being also found in North America, the Eastern and Western States, and in Mexico. 



Allolobophora snbrabicnnda Eisen 1874. 

 Syn.: Allolob. subrulricunda Eisen 1. c. p. 51. 



Corpus cylindricum, antice aliquid depressum, postice attenuatum. 



Lobus cephalicus magnus, pallidus, dimidiam partem segmenti buccalis occupans. 



Cingulum magnum, perspicuum, e septem segmentis sa?pe confectum. 



Tubercula pubertatis tria in segmentis 27, 28, 29 in utroque latere cinguli. 



Setse ubique bin», approximatse, sed intervallo aliquanto majore quam in Allolob. 

 fa? tid a. 



Segmenta circiter 90. 



Longitudo circiter 90. 



Habitat: Collected by the expedition in two places of southern Siberia: between 

 Tomsk and Kainsk, and between Tomsk and Krasnojarsk, along the 55° lat. The 

 specimens were of a somewhat smaller size than the typieal ones from Upsala, but still 

 perfectly characteristic. 



Allolobophora tennis Eisen 1874. 

 Syn.: 1874. Allolob. arborea Eisen 1. c. p. 49. 

 » » tenuis Eisen Öfvers. af K. Sv. Vet. Akad. Förh. 1874. N:o 2. 



pag. 44. 

 Corpus cylindricum antice et postice attenuatum. 



Lobus cephalicus magnus, pallidus, postice quadrangulus, tres partes segmenti buc- 

 calis occupans. 



Cingulum e sex 1. septem segmentis confectum, porus prominens. 

 Tubercula pubertatis in utroque latere cinguli segmenta 28 — 29 occupantia. 



