BILATTICE STRUCTURE OF THE MYOFIBRIL OF SOUNDING MUSCLE AND ANALYSIS OF THE ORIGINAL PROCESS OF SOUND-PRODUCTION IN Mingming CICADA(Oncotympana maculaticollis Motsch)
鸣鸣蝉（Oncotympana　maculaticollis　Motsch）发声肌中肌原纤维的双阵列结构及莫发声原初过程的分析

The myofibril bilattice structure of sounding muscle in Mingming cicada is given in this paper, and there exist simultaneously two kinds of myofibril,the fast-speed and slow-speed myofibril (FSM and SSM), in sounding muscle fibels. Although the FSM and SSM have identical framerks consisting of thick filaments,the ratios of thin-to -thick filaments(RTTF) are different, i.e. 3.1 and 5.1, respectively. This kind of bilattice structure differs obviously from the myofibril monolattice structure with the RTTF at 3:1 of sounding muscle of cicadas singing in mono-toned song. So, such structure in Mingming cicada is adapted to the original mechanism of vari-toned song production.