| 22 | 93.4| 28.1| 14.0| 4.4| 11.2| 6.0| 4.5
max.| 205 | 105 | 22 | 105.0| 28.7| 14.2| 4.6| 11.7| 6.4| 4.6
min.| 187 | 90 | 22 | 85.7| 27.3| 13.4| 4.3| 10.6| 5.7| 4.3
-------+------+------+-----+------+-----+-----+----+-----+----+----
11 mi. W, 8 mi. S Piedra, Tamaulipas
-------+------+------+-----+------+-----+-----+----+-----+----+----
5 mean| 201.8| 101.8| 22.6| 101.8| 28.5| 14.0| 4.4| 11.3| 6.1| 4.3
max.| 214 | 110 | 23 | 109.3| 29.0| 14.1| 4.6| 11.5| 6.2| 4.7
min.| 193 | 94 | 22 | 94.9| 28.2| 13.9| 4.2| 11.0| 6.0| 4.1
-------+------+------+-----+------+-----+-----+----+-----+----+----
_P. boylii ambiguus_
La Vegonia, Tamaulipas
-------+------+------+-----+------+-----+-----+----+-----+----+----
7 mean| 199.1| 101.6| 21.3| 104.3| 26.9| 13.4| 4.3| 10.5| 5.6| 4.3
max.| 213 | 109 | 22.4| 108.9| 28.6| 13.7| 4.5| 11.8| 5.9| 4.7
min.| 188 | 97 | 20 | 98.0| 26.4| 13.2| 4.2| 9.5| 5.3| 4.1
-------+------+------+-----+------+-----+-----+----+-----+----+----
Monterrey, Nuevo Leon
-------+------+------+-----+------+-----+-----+----+-----+----+----
16 mean| 199.7| 103.2| 21.3| 106.9| 27.6| 13.9| 4.4| 10.7| 5.6| 4.2
max.| 216 | 114 | 22 | 125.6| 28.2| 14.9| 4.6| 11.5| 5.8| 4.5
min.| 176 | 92 | 19 | 88.0| 26.8| 13.2| 4.1| 10.2| 5.0| 4.0
-------+------+------+-----+------+-----+-----+----+-----+----+----

_Specimens examined._--Total 64 as follows: NUEVO LEON (USNM):
Monterrey, 37; _Cerro de la Silla_, 18. COAHUILA: 12 km. E San
Antonio de las Alazanas, 9000 ft., 2. TAMAULIPAS: La Vegonia,
Sierra San Carlos, 7 (UMMZ).

I am grateful to the following persons for the loan of specimens: G. B.
Corbet, British Museum, Natural History (BM); David H. Johnson, United
States National Museum (USNM); George H. Lowery, Jr., Louisiana State
University (LSU); Philip Hershkovitz, Chicago Natural History Museum
(CM); William B. Davis, Texas Agricultural and Mechanical College (TAM);
W. H. Burt and Emmet T. Hooper, University of Michigan Museum of Zoology
(UMMZ). Specimens lacking designation as to collection are housed in the
Museum of Natural History of The University of Kansas. I am indebted to
Professor E. Raymond Hall and Mr. J. Knox Jones, Jr. for the use of
these specimens and for other assistance. It is appropriate to record
also that the findings reported above are