696 Hans GaDow, 
T. templada and T. fria, respectively up to 3000, 6000 feet and 
beyond, above sealevel. A 4000 feet range makes an obvious difference 
everywhere; a species centred in the Hot belt extends well into the 
temperate belt, and the same range applied to a “temperate” species 
may extend it far into the hot or well into the cold zone. And it 
is obvious that a range of more than 6000 feet implies that the 
respective species is found in all three zones unless it be one of 
the few species which extend very far up on high mountains. 
Species with a range of 4000 feet or less are here called short- 
ranged; those with a range of 5000 feet and more are long-ranged. 
Although this is quite an arbitrary distinction the arrangement 
N gives some valuable results. 
Of such short-ranged 
| SE species we have about 55, some 
Bi of which doubtful as to category. 
35 species occur in the Hot- 
11000 ae lands, approaching sealevel, and 
Re ae] ein of them 15 are restricted to the 
a0oo0k Hotlands while 20 ascend beyond 
nen them, up to 4000 feet. Nearly 
all these 35 are native tropical 
species. 
9000 h+° 
8000 o++0 00 BR 
7 000 Jooo+e ale 
Maul Diagram No. I. 
N Showing the amplitude of range of 
5.000 . J 
Be The numbers of Southern species are 
indicated by white circles. 
a a aan deze Sonorans by erosses, Nearcties by black 
Ba a a For instance 13 Southern, 10 Sonoran 
a and 2 Nearctic species, total 25, 
2.000 oooooo#+e have a vertical range of 4000 feet. 
BREI LEN — A range of 9000 feet is attained 
h 2 eti j 
Allan — by 2 Sonoran and 1 Nearetie species. 
20-24 Species 
a; - 
