4 
THE COMITY OF SPIDERS 
of doubt. J. E. Hull, for instance, contends that a number of J. 
Blackwall's species (of which the types are lost) should be reinstated 
(1920). Other arachnologists consider that the descriptions are 
inadequate to provide reasonable assurance of their identity and, by 
general consent, their claim to recognition has been discarded. 
A number of genera, notably those included in the Linyphiidae, are 
so badly defined as to be worthless. Changes there are sure to be, and 
in the meantime I follow several of the provisional conclusions 
reached by Dr. Jackson, who will, I hope, complete and publish his 
extensive researches into the natural groupings of Linyphiid species. 
A good example is provided by the species formerly included in the 
genus 
Diplocephalus
.
Dr. Jackson has pointed out that the sexual 
organs of these species clearly sort them into three divisions (1) 
becki
;
(2)
 fuscipes 
and 
castaneipes
;
(3)
 cristatus
,
 latifrons
,
 permixtus
,
adjacens
,
 jacksoni
,
 protuberans 
and 
picinus
.
F. P. Smith (1906) had 
previously reached the same conclusion. He referred 
becki 
to 
Tapinocyba
,
and 
fuscipes 
and 
castaneipes 
to a new genus 
Monocephalus
.
Later Simon correctly moved 
becki 
to 
Thyreosthenius 
but wrongly (a)
regarded 
castaneipes 
as a sub species of 
fuscipes 
and 
(b)
included this, together with 
latifrons
,
in 
Plaesiocraerus
,
of which 
the type is 
longicarpus
.
 Hull 
(1932) correctly adopts 
Monocephalus 
for 
fuscipes 
and 
castaneipes
,
but incorrectly adds 
becki 
and 
picinus
.
Becki 
is a 
Thyreosthenius
.
 Fuscipes 
and 
castaneipes 
are referable to 
Monocephalus
.
The remainder can be retained in 
Diplocephalus
,
with 
picinus 
linking this genus closely to 
Savignia
.
The status to be assigned to a genus cannot be defined with 
exactitude, but nevertheless I consider Simon is inconsistent when he 
splits up certain fairly compact genera, such as 
Bathyphantes 
and 
Meioneta 
(
Micryphantes
),
and merges such other well established 
genera as 
Singa
,
 Cercidia 
and 
Aranea
.
One of these genera, 
Meioneta
,
requires special attention.  





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