Small and delicate compared with the common serotine (weight about 10 g). This is a Palearctic species, whose main distribution is in the eastern Mediterranean basin. In Israel, the species is found along the Syrian-African Rift and its margins, from Eilat to the Dead Sea area. With penetration into the central Negev, mainly along Nahal Zin. 

Negev serotine, Eptesicus bottae, a desert crevice-dwelling species   © בני שלמון

In summer 2010 (18/8/2010) was identified Negev serotine in Be'er Sheva - the bat was not captured, but identified using field detectors. Examination of the recordings confirmed that it was indeed a Negev serotine. 
 

Frequency: 32-33 (25-65) kh
Recordings and spectrograms on the page Negev serotine in the sound library

Negev serotine, Eptesicus bottae. Found in desert areas   © עזרא חדד