56 
Psyche 
[June 
Maiz (3300') one colony of Procryptocerm scahriitscvlus; 
El Salto (1400') 30 miles west of Antiguo Morelos, one 
stray worker of Cryptocems scutellatus. 
Tamaulipas : 
5 miles west of Altimira (300') one colony of C. (Para- 
cryptocerus) minutus\ 
The three northernmost records cited above (Ciudad del 
Maiz, El Salto and Altimira) all lie less than ten miles 
from Latitude 22° 30'. They are, thus, a little more than 
fifty miles south of the Tropic of Cancer. As has already 
been shown the present known range of texanus does not 
extend south of Latitude 24° 40', which is approximately 
eighty miles north of the Tropic of Cancer. As things 
stand at present there is a gap of one hundred and thirty 
miles between the southern end of the range of texanus 
and the northern end of the range of the species cited 
above. Further studies in northeastern Mexico, particular- 
ly in the mountains southwest of Ciudad Victoria, may 
narrow or even close this gap. But if this happens it will 
not alter the fact that the distribution of texanus has little 
in common with that of the Neotropical species. For the 
range of minutus extends to southern Brazil and the other 
three species range into Colombia and Venezuela. It is 
safe to assume, therefore, that the area of maximum abund- 
ance for each of these species lies well within the tropics. 
This is certainly not the case with texanus, which is more 
abundant near the latitude of San Antonio, Texas than 
anywhere else in its range. 
A comparable pattern of distribution has been reported 
by the senior author (11) for another “Neotropicar' 
species, Pseudomyrmex apache. It would appear that the 
Neotropical component of the ant fauna in the southern 
United States is more complex from a distributional stand- 
point than has been previously supposed. Some of our 
representatives are northern fringes of species whose main 
range lies in the tropics. But others, like Cryptocerus tex- 
anus and Pseudo7uyr7nex apache are more at home out of 
the tropics than in them. This last type of distribution 
^Winged males and females were present in this colony and in one 
from Tamazunchale. Both colonies were taken in early April._ 
