_Nycticeius humeralis_ has the same distributional pattern in
Tamaulipas as has _Lasiurus borealis_ in that both are represented
there by two subspecies, one known only from Matamoros and the other
occurring in the rest of the state. Bats of this species (_N. h.
mexicanus_) from Ciudad Victoria and some from the Sierra de Tamaulipas
were shot in flight in evening; others from the last-mentioned locality
were taken in mist nets. Lactating females (22 specimens) were
collected in June and July.
=Nycticeius humeralis humeralis= (Rafinesque)
1818. _Vespertilio humeralis_ Rafinesque, Amer. Monthly
Mag., 3(6):445, October, type from Kentucky.
1819. _N[ycticeius]. humeralis_ Rafinesque, Jour. Phys.
Chim. Hist. Nat. et Arts, Paris, 88:417, June.
_Distribution in Tamaulipas._--Matamoros (Miller, 1897:120),
one specimen.
=Nycticeius humeralis mexicanus= Davis
1944. _Nycticeius humeralis mexicanus_ Davis, Jour. Mamm.,
25:380, December 12, type from Rio Ramos, 1000 ft., 20 km.
NW Montemorelos, Nuevo Leon.
_Distribution in Tamaulipas._--Known certainly only from
central part, but probably occurs at suitable places in all
but extreme northern Tamaulipas.
Twenty-seven of 37 adults of _N. humeralis_ examined from Tamaulipas
are pale as is _N. h. mexicanus_, but 10 are darker and approach _N. h.
humeralis_ in this respect. Twenty-two females averaged 10.3 (9-13)
grams and eight males averaged 9.5 (8-11) grams in weight.
_Records of occurrence._--Specimens examined, 45: Cd.
Victoria, 10; Sierra de Tamaulipas, 2-3 mi. S, 10 mi. W
Piedra, 1200 ft., 31; 3 mi. S, 16 mi. W Piedra, 1400 ft., 4.
=Rhogeessa tumida tumida= H. Allen