436 The American Naturalist. i [May, 
On the Genera and Species of Euchirotidz.—Professor 
Alfredo Dugés of Guanajuato, Mexico, has sent me an ms. description 
of a new Amphisbenian from the state of Guerrero, Mexico, which 
is allied to Bipes (Chirotes Cuv.), but which possesses but three digits, 
and presents various other differences from the B. canaliculatus, 
= = 
A En a 
HT = O a 
ira ZS5E 
— So ie! 
= = on Gl me 
ry = toti 
uae sseREseoenes ~ oe SEES 
os yr ; ieee a foe 
b AR ae EE 
= 
DoD 
veers 
Fig. 5.—Zuchirotes biporus, Cope. : 
including a much shorter tail. In endeavoring to determine - 
relationships with the known species of Bipes, I find that the individ- 
uals from Cape St. Lucas, Lower California, which I have hitherto 
assumed belong to the Bipes canaliculatus Lacép. really represe P 
another species and genus. I now offer diagnostic characters of these 
forms, preliminary toa fuller notice in my forthcoming Sealed Rep- 
tiles of North America. 
Digits five, all clawed ; Euchirotes Cope 
Digits five, one smaller and clawless; Bipes Lacép. 
Digits three, clawed ; Hemichirotes Duss 
Each of these genera includes a single species, which are a 
ized as follows. 
Euchirotes biporus Cope 
sp. nov.. Tail twice 2 
long as head; anus ji 
ceded tranar 
series of six e re 
which extend to 
Nasal plates 
Fig. 6.—Hemichirotes tridactylus, Day. contact in front. 
