Melanotic tumors in caudal fat bodies; penetrance incomplete though raised to 100% by selection Characterized by precocious transformation of plasmatocytes into lamellocytes (which usually occurs at time of pupation); subsequent encapsulation of tissue by lamellocytes produce melanotic masses. Viability and fecundity low. RK3.
Modifiers on the X and third chromosomes. Not allelic to tu(2)bw or tu(2)4849h.