Abstract
In the present study the chromosomes were investigated in six species of the Hemerobiidae and seven species of the Chrysopidae. The results of investigation are summarized in Table 1.
In all species studied here, the X-Y mechanism of the sex-determination was established in male cells. The X- and Y-elements show a remarkable precocious separation in the first meiotic division.
In the Hemerobiidae, the Hemerobiinae seems to be characterized by the basic number of 2n=14, but no such number has been obtained in the Microminae.
The chromosomal relationship seems to favor the older view that the Chrysopidae is to be subdivided into Chrysopa, Nineta and Chrysotropia.
