抄録
The chromosomes of Pipistrells tralatitus abramus, a species of the Vespertilionidae (Microchiroptera), was investigated in male germ-cells. The number of chromosomes was found to be 26 in diploid and 13 in haploid. The sex chromsomes are of the usual XY-type, consisting of a medium-sized subterminal X and a small rod-shaped Y.
This species is remarkable not only for the considerably low number of the chromosomes, but also for the complement which contains only two pairs of the telocentric elements. The chromosomal relation of this species to other vespertilioniid bats was discussed.
