Geographic distribution.—Extreme southeastern Virginia, south along Atlantic Coast to and including peninsular Florida (except possibly extreme southern tip), thence westward to southern Louisiana and the southern part of eastern Texas (see Fig. 2).

Diagnosis.—Size small (see measurements); sagittal crest present but low; interorbital region relatively broad; teeth essentially as in L. i. intermedius except averaging smaller; pelage yellowish-brown to grayish-brown. For comparison with the Cuban subspecies, see account of that subspecies.

Comparisons.—From Lasiurus intermedius intermedius, L. i. floridanus differs as follows: averaging smaller (see measurements), especially in forearm and skull; teeth smaller; skull having less prominent sagittal and lambdoidal crests; braincase more nearly round; tympanic shields over petrosals approximately same size and therefore relatively larger; pelage of upper parts duller, yellowish-brown to brownish-gray instead of yellowish to yellowish-orange.

External measurements.—Average (and extremes) of 14 February-taken males from along the Aucilla River, Jefferson Co., Florida: Total length, 126.8 (121-131.5); length of tail-vertebrae, 54.2 (51-60); length of hind foot, 9.8 (8-11); length of ear from notch (13 specimens), 16.3 (15-17); forearm (dry, 13 specimens), 48.1 (46.7-50.0). Corresponding measurements of the holotype, an adult female (after Miller, 1902:392): 129, 52, 9, 17, 49. Average (and extremes) weight in grams of the series of males: 17.7 (15.5-19.5). For cranial measurements see Table 1.

Records of occurrence.—Specimens examined, 65, as follows: Texas: Austin, 1 (Texas U.); 4 mi. N Huffman, 1 (Texas A & M); Houston, 3 (1 KU; 2 MVZ); Eagle Lake, 1 (Texas A & M). Louisiana: 5 mi. N Baton Rouge, 1 (LSU); 1 mi. W LSU Campus, Baton Rouge, 1 (LSU); Baton Rouge, 7 (1 AMNH; 5 LSU; 1 USNM); ½ mi. E Baton Rouge, 1 (LSU); North Island, Grand Lake, 1 (LSU); Lafayette, 2 (USNM); Houma, 2 (USNM). Georgia: Beachton, 11 (6 Chicago Mus.; 5 USNM). Florida: 2 mi. S Tallahassee, 1 (AMNH); 5 mi. W Jacksonville, 1 (AMNH); Aucilla River, 15 mi. S Waukenna, 7 (Univ. Fla.); Aucilla River, at U.S. Hgy. 98, 8 (Univ. Fla.); W of Gainesville, 1 (Univ. Fla.); Gainesville, 3 (2 Univ. Fla.; 1 Univ. Mich.); near Gainesville, 1 (Univ. Fla.); Alachua County, 1 (Univ. Mich.); 2 mi. SW Deland, 2 (Univ. Fla.); head of Chassahowitzka River, 1 (USNM); Lakeland, 2 (Univ. Fla.); Seven Oaks [near present town of Safety Harbor], 2 (1 AMNH; 1 USNM); Lake Kissimmee, 1 (USNM); Palm Beach, 1 (Univ. Fla.); Mullet Lake (not found), 1 (USNM).

Additional records: Virginia: Willoughby Beach (Rageot, 1955:456). South Carolina: 5 mi. NW Charleston (Coleman, 1940:90). Louisiana: New Orleans (Lowery, 1943:223). Mississippi: Hancock County (Hamilton, 1943:107). Georgia: W edge Camilla (Constantine, 1958:65). Florida (Sherman, 1945:195, unless otherwise noted): St. Marys River [near Boulogue]; vicinity Palm Valley (Ivey, 1959:506); 6 mi. N Lake Geneva (Sherman, 1937:108); Old Town; Welaka (Moore, 1949a:59); Bunnell; Ocala; Davenport; Hillsborough River State Park; 1 mi. NE Punta Gorda (Frye, 1948:182); Miami (Moore, 1949b:50).

Holotype.—Adult female, preserved in alcohol but having skull removed, formerly in the Poey Museum, University of Havana, now No. 81666, Museum of Natural History, University of Kansas, from Cienfuegos, Las Villas Province, Cuba; obtained on January 23, 1948, by D. Gonzáles Muñoz.

Geographic distribution.—Known only from the island of Cuba (see Fig. 2).

Diagnosis.—Large throughout (see measurements); sagittal crest enormously developed, especially posteriorly (height above braincase averaging 1.7 mm. in 4 specimens); interorbital region narrow; M3 narrow; mesostyle of M1 and M2 and 2nd commissure and cingulum of M3 small; pelage yellowish to reddish-brown.

Comparisons.—From Lasiurus intermedius intermedius of the adjacent mainland of México, L. i. insularis differs as follows: Larger, both externally and cranially; sagittal crest relatively higher, especially posteriorly; interorbital region relatively narrower; palate longer posterior to tooth-rows; teeth distinctly larger throughout except M3, which is relatively (frequently actually) narrower, averaging 66.1 (62.5-71.0) per cent width of M2 in insularis rather than 74.1 (66.6-79.3) per cent in 10 intermedius from Brownsville, Texas; mesostyle of M1 and M2 relatively smaller as are second commissure and cingulum of M3; coloration of No. 254714 USNM resembling that of L. i. intermedius, but coloration of three specimens, preserved in alcohol, averaging somewhat darker (more reddish-brown) than in intermedius.

From Lasiurus intermedius floridanus of the adjacent Floridan mainland, L. i. insularis differs in many of the same ways that it differs from L. i. intermedius, except that the differences are even more trenchant because floridanus is smaller than intermedius. Indeed, the difference in size between floridanus and insularis is approximately the same as between Lasiurus borealis and Lasiurus cinereus.