188-1.] MR. W. LECHE ON CHIROPTERA FROM AUSTRALIA. 51 



with a very large gular sac, much larger than in any other known 

 species of the genus ; while, on the other hand, in the female of the 

 same species, " the fur covering the wing-membrane along the sides 

 of body beneath does not differ in colour from the fur covering the 

 sides of the abdomen," also in the same, " the margin of the mouth of 

 the gular sac is alone developed." Mr. Dobson correctly calls atten- 

 tion to these secondary sexual characters as peculiarly noticeable, as 

 such differences between the male and female of insectivorous Bats 

 are very rare. Of especial interest now is the fact, that the female of 

 Nyct. albldus, in the respect just alluded to, corresponds precisely with 

 the male of Nyct. avstralis, as both the white colour of the under- 

 part of the wing-membrane and a large, particularly well developed 

 gular sac appear. Here, also, the very singular fact meets us, 

 that characteristics which in one species are exclusively distinctive 

 of the one sex, are found in a nearly related species in the other. 

 Unfortunately I have not had an opportunity of examining any 

 male of Nyct. albidas ; it is highly probable, however, that, at 

 least with regard to the characteristics mentioned, no secondary 

 sexual characteristics appear in this species. 



Upper incisors long, with the points of the teeth strongly conver- 

 ging towards each other ; the very small first upper premolar not 

 filling the middle space between the canine and second premolar. 

 The four lower incisors plainly bifid ; first lower premolar about as 

 high as the first molar, and not much lower than the second pre- 

 molar. 



Hab. South Australia. 



Measurements (female). 



millim. 



Length, head and body 85 



„ head 30 



tail 47 



„ tail, free from membrane 28 

 „ ear, outer margin .... 20 



tragus 5 



,, forearm GO 



,, third finger, metacarpal 58 

 „ fifth finger, metacarpal 32 

 „ tibia 30 



3. Nyctinomus plicatus. 



Several specimens completely corresponding with Dobson's descrip- 

 tion of this species (Catal. of Chiropt. p. 425), which has hitherto, 

 according to Dobson, only been found in the peninsula of India, 

 Sumatra, Java, Borneo, Malay peninsula, and the Philippine Islands, 

 are in the collection, obtained from South Australia and Northern 

 Tasmania. 



4. Taphozous affinis, Dobson, var. insignis, mihi. 



Up to this time only one Australian species belonging to this genus 



4* 



