800 



THE AMERICAN NATURALIST H^ol. XLI 



discovery of a fourth segment in the suboesopliai^val tjaiit^lion of 

 Anurida is entirely useless since the endolabimn of Phalacrocera 

 larva is not homologous with the paraglossae of the Thysanuni. 



The Habits and Structure of a Myriapod.— S. R. Williams^ presents 

 many new observations on the habits and structure of the interesting 

 myriapod, Scutigerella immaculata. Its distribution, environment, 

 light and water relations, and food habits are discussed. Experi- 

 mental evidence favors the conclusion that the species is carnivorous. 

 There is also presented considerable data regarding the eggs and the 

 larvae. The newly-hatched larva has seven pairs of legs while the 

 adult has twelve pairs. The author regards it as a highly specialized 

 young, rather than a generalized ancestral form such as the hexapod 

 larva of other diplopods is considered to be. 



Musical Organs of the Cicadidae. — Among the most remarkable and 

 effective voice-organs of the entire animal kingdom are the "drums" 

 at the base of the abdomen of the males of the "seventeen-year locust" 

 and their relatives in the family Cicadidae. It would seem that for 

 these insects any other musical apparatus would be superfluous but 

 Jacobi,^ '07, reports finding in the cicadid genus Tettigades, Irom 

 Chih, ^tridulaniig oigan^ Acn sinulai to tlios ,lt(a<h reported lor 

 certain]. <1 .r.T. in.l oil. , tu, ^1 1.. ^ ( on i t of a pair of oxal, 



roiijl. iimI f,l, l,k M on 111 .1.), ,1 p. II ot th prothoiax, jnst 

 VMtliHi an.] ( mdi.l ot ili b. > ol tlu itoiu uii^. On the eaudal 



Unlike the abdonnnal musical organs these stndulatmg organs are 

 equally developed in both sexes. 



lems m tlie dcterm 



