129 
dorsocentral bristles; in the same place (p. 196) he records Bergen- 
stammi , of which species he knew only the female, which he loc- 
ates by its four dorsocentral bristles. In 1910 Malloch (Ann. Scott. 
Nat. Hist. 21) unites the two species, because he had a pair in 
copula of which the male had two, the female four dorsocentral 
bristles, and he therefore declares, that the male of Bergenstammi 
has only two dorsocentral bristles. In 1912 Wood (1. c. XXIII, 95) 
consents with this uniting of his species with Bergenstammi. Fi¬ 
nally Schmitz treates in 1917 (Biol. Zentralbl. 37, 34) and 1918 
(Jahrb. van het Natuurh. Genootsch. in Limburg, 1917, 92) as 
Bergenstammi the same species, and remarks that the male has 
two, the female four dorsocentral bristles, so that he thinks it a 
failure that Becker had ascribed the male four bristles. Neither 
Malloch nor Schmitz made any mention of the male palpi. 
From the material of shells of species of Hetix which, as re¬ 
marked above, was sent to me in 1918 from Mr. L. Jørgensen, I 
bred in April a species which I after Becker determined as Ber¬ 
genstammi ; it completely agreed with Becker’s description, the 
male had the bristles on the palpi very small and both sexes showed 
four dorsocentral bristles, and quite the same was the case with 
several specimens taken with the net on various localities, all my 
specimens were in these respects quite alike. As I did not under¬ 
stand this, but thought it possible, that my species might be an- 
other than that described by Schmitz, I sent him a male together 
with puparia, and he also was of opinion, that it was another spec¬ 
ies than his Bergenstammi , and he kindly sent me this latter 
species together with puparia, which, as he remarked, also were 
different from the puparia sent by me. I now exajnined both spec¬ 
ies and found them distinet; they represent evidently two very 
similar species, one with four dorsocentral bristles in both sexes 
and with the male palpi almost nude, the other with two dorso¬ 
central bristles in the male, four in the female and with the male 
palpi with normal armature, and it is easily established that the 
former is Bergenstammi Mik, the latter domestica Wood, as also 
supposed in Schmitz’s letter to me. As seen the males of these 
two species are recognized at once by the characters given, but 
also the females may be distinguished with certainty by charact¬ 
ers which are common to both sexes; thus in Bergenstammi the 
Vidensk. Medd. fra Dansk naturh. Foren. Bd. 71. 
9 
