838 THE AMERICAN NATURALIST.  [Vor. XXXIV. 
found a minute arachnid which at first sight resembled the whip- 
tailed scorpions (Thelyphonus), but on closer inspection proved 
to be something very different. Text-books were consulted 
in vain, with the single exception of Lang's Vergleichende 
Anatomie, which put me on the track of the Microthely- 
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phonida of Grassi. Then, through the kindness of Drs. Hansen 
and Sorensen, I received a copy of their paper on Kanenia 
mirabilis. To my surprise the Texan form proved to be iden- 
tical with the Sicilian species ! 
In the following pages I shall consider, first, the external 
structure and systematic affinities of Koenenia ; second, its 
habits and habitat ; and, third, its singular geographical dis- 
tribution. If I repeat many of the statements in Hansen 
