Drosophila melanogaster
from 67 collections have been analysed for their polymorphic inversions. Of the 53 inversions now known in this species 7 are widespread and 43 are endemic. The remaining 3 inversions may be widespread, but if so they are usually very rare. No X or fourth chromosome inversions were found. All the third chromosome inversions were paracentric, while six of the second chromosome inversions were pericentric. No inversions were found in
D. simulans
, of which 27 collections, from Africa, Europe, Australia and S. America, were studied.
PSEUDOTUMORS AND FITNESS IN DROSOPHILA MELANOGASTER AND DROSOPHILA SIMULANS