46 Psyche [March-June 
ably similar to Chilades forms (especially to the galba group), 
the remarkable point being that while the palaeotropical ones 
are sympatric with the kind of CatochrysopincB which they re- 
semble (and which is especially well represented in Africa, e.g., 
“Euchrysops” 1 ), the latter does not exist in the neotropics 
(where the sparse representatives of the Catochrysopinoc be- 
long, as exemplified by the holarctic Leptotes , to a different 
phase of pattern). The Ityloid pattern group includes: Itylos, 
one of the two Pseudolucia species, Paralycceides (to a certain 
extent) and Parachilades. At its initial stage the “pseudovitta” 
of Itylos copies the differently formed vitta of certain palearctic 
Plebejince (cp. Agrodicetus damon or Aricia donzelli). 
Taking 100 as the minimum number of known Plebejinoe 
(see footnote further on) the following figures may be given 
for the various regions where these insects occur. Only six 
species exist in the Palaeotropical region proper, one reaching the 
Palaearctic, another reaching both the Palaearctic and S. Africa 
and a third extending into Australia. As many as 19 (probably 
more) exist in the neotropical region (12 of these are restricted 
to the Andes) and nowhere else, except for the fact that 2 reach 
the nearctic as 2 do in regard to the Caspian and E. Mediter- 
ranean region (these four invaders are not taken into account 
further on 2 ). As many as 60 occur in the Central Palaearctic 
(between 40° and 90° longitudes). One half of these, with the 
addition of only half-a-dozen (most of which are poorly differ- 
entiated) not occurring elsewhere, are found in the Western 
Palaearctic (the whole of C., N.W. and W. Europe having 20, 
all of which it shares with the Mediterranean area, while 2 7 can 
be collected in a narrow area stretching from the southern Alps 
to the mountains of Spain) ; but in the Eastern Palaearctic the 
number dwindles to 12, all of which occur also in the Central 
Palearctic. 
Some 30 (of which only 3 are holarctic) are found in the 
New World, and of these hardly a dozen exist in N. America. 
All these occur in its western part; only 5 reach eastern Can- 
ada and only one sparsely occurs in a large 3 area between the 
1 Provisionally : Euchrysops Butler, sensu mihi—Euchrysops s. Bethune Baker 
-\-Neochrysops Bethune Baker minus the niobe group, for which the erection of 
a separate genus is necessary. 
2 In the eastern part of the Central Palearctic half a dozen palearctic species 
attain along the mountain chains technically tropical territory. 
3 The paucity of true butterflies in the eastern United States is unrivalled in 
any other general area of the same size in the temperate part of holarctic territory. 
