Reproductive data from Sonora and Chihuahua are as follows: of the five Chihuahuan specimens, two are immature (open epiphyseal sutures); the one adult female (79443) contained a single embryo 28 mm. in crown-rump length. Eight of 20 Sonoran specimens taken in May are females, each of which lacks epiphyseal sutures, and each contained one embryo. One embryo measured 8 mm. in length of uterine enlargement; all others are longer than 20 mm. from crown to rump, but vary in stage of development, some having no pigmentation in the membranes and others having pigmentation. The forearm is only 42 mm. long in one young male from Sonora. Three of 8 Sonoran specimens taken in July had open epiphyseal sutures but were of adult size. In summary of the reproductive data by states, _Artibeus hirsutus_ is known to bear embryos in the following months: May in Sonora, July in Chihuahua, February in Jalisco, and May in Guerrero. These data, along with the presence of embryos and young of various ages among specimens taken at the same place and time, indicate that the species does not have a restricted breeding season. A geographic overlap of the ranges of _A. hirsutus_ and _A. jamaicensis_ from Guerrero to central Sinaloa is now known. But the two species have not been taken at the same place within this region of overlap. ~Other species.~--At the locality on the Rio Septentrion, 1500 feet, 1-1/2 mi. SW Tocuina, Chihuahua, from which specimens of _A. hirsutus_ were obtained as mentioned previously, several other species of tropical bats were captured, including _Desmodus rotundus murinus_ Wagner, _Glossophaga soricina leachii_ (Gray), _Chilonycteris parnellii mexicana_ Miller, _Sturnira lilium parvidens_ Goldman, and _Chiroderma_ (specimens not yet certainly identified to species). The canyon of the Rio Septentrion is steep and rocky, the tropical vegetation occurs only in the bottom of the canyon, and unless construction of a railroad had been in progress the area could have been reached only after several days by means of a pack train. From a distributional standpoint the occurrence of _Sturnira_ and _Chiroderma_ 1-1/2 mi. SW of Tocuina is of unusual interest. The published record of _Sturnira lilium_ nearest to Tocuina is from 2 mi. N Ciudad Guzman (19 deg.43', 103 deg.28'), Jalisco, and the nearest published record of the genus _Chiroderma_ is of _Chiroderma isthmicum_ from Presidio (18 deg.37', 96 deg.47'), Veracruz (Hall and Kelson, 1959:126, 134). The Chihuahuan specimens extend the known range of _Sturnira lilium_ approximately 585 miles northwestward and that of the genus _Chiroderma_ approximately 920 miles northwestward from the localities noted above. Five specimens (79434-79438) of _Sturnira lilium_, two adults and three immature individuals, were taken from July 18 to July 22, 1958, by the author and Kenneth E. Shain, as also were the two (79439-79440) _Chiroderma_.