AET. 17 



ON TERRESTRIAL ISOPODS LOHMANDEE, 



edge of which does not even reach the terminal joint of the endopo- 

 dite. I designate this form as variety rotv/ndatus^ new variety. 



Lundblad (Entomol. Tidskr. Stockholm, 1914) has described 

 individuals of this species from Sweden with only four sensory fila- 

 ments on the antennulae under a special varietal name, while Sars 

 (1899, p. 169) gives six; but this variety can hardlj^ be maintained, 

 as the number of sensory filaments seems to vary between four and 

 six. I have found that five is the most common number, 



Haplophthalmus danicus is widely spread in Europe, including the 

 Scandinavian countries. The species, however, can not be indige- 



PiG. 2. — Haplophthalmds danicus Bddde-Lund. Male : a. First leig ; 6. Seventh leg ; 

 c. First pleopod ; d. Second PLEiOPOD 



nous within the greater part of its European range but has certainly 

 been introduced through the agenc}^ of man. It has been transported 

 with garden produce, etc., and under favorable conditions has spread 

 farther independently afterwards. It is often to be found under 

 very natural conditions in Scandinavia. 



The genus Haplophthalmus probably originated in the south of 

 Europe as Verhoeff (1908, p. 195) has demonstrated. H. danicus has 

 undoubtedly been introduced into North America in the same manner 

 as into the northern parts of Europe, as with garden produce, 

 etc. There will perhaps be found still another species of this genus 



