THE SPERM STRUCTURE OF THE GALL-MIDGES ANARETELLA AND LESTREMIA (INSECTA, DIPTERA, CECIDOMYIIDAE)

The sperm structure of some dipteran flies belonging to the Lestremiin i tribe have been examined, Anaretella cincta was shown to have an axo neme made of 20-21 microtubular doublets, disposed in a circle in a cr oss section and surrounding a mitochondrion. Other crystal-containing mitochondria flank the axoneme; a second species (Anaretella sp,) was provided with 21-22 axonemal doublets, Lestremia is characterized by a flattened axoneme, consisting of about 150 doublets arranged in 2 ant iparallel rows and surrounding a few mitochondria, These mitochondria, in Lestremia sp., have a crystalline core that is missing in Lestremi a cinerea, The structure of microtubular doublets is quite similar in the 2 related genera and a derivation of the flattened axoneme found i n Lestremia from that circular of Anaretella is suggested. Sperm struc ture suggests that Lestremia cinerea is not a uniform species.