rilK .MYK'IAni|>A IN I'lIK AI'STIiAMAN MI'SKUM l;i-!(")l,K.\l ANN. 93 



Last sesfnieut more ti'iaiiLruliU' (fliaii in Aiinjildilesiitiis and 

 Ijt'litoih^niliiin). 



Tergites destitute of warts. 



Steriiite unai'ined. 



Warts of the anal sternite small, not exceeding the apex of the 

 sternite. 



Trochanter of ambulatory legs spineless ; other joints sub- 

 equal, the femur not being twice longer than the tibia. 



Pleuro-sternal suture not keeled (this last chai'acter is sup- 

 posed to sepai'ate Eiixtnimiiilosinna from iSfruiKjijIottonm, 

 Brandt). 



Not a single word is said of the sti'ucture of the copulatory 

 appendages, and the genus thus appears so doubtful, that Dr. 

 Attems, in his well-known " System der Polydesmiden," was 

 led to consider Silvestri's denomination as synonymous with 

 StroNgylocoH/ii. 



To E list rong ylosoma is ascribed, as type specimen, the New 

 Guinea, St ro)ir/ylo><om a f I isci (it >i 1)1.^^ No figure of the gonopods 

 was given, but it is said in the diagnosis : — " ^ : pedum omnium 

 articulus ultimus infra setosissimus ; pedes copulativi simplices, 

 apice multo recurvato circulum fere formante." The g(uiopods 

 of E. fasri lit 11)11 being undivided, " simplices," it is utterly 

 impossible to place beside it the continental forms with con- 

 densed and split telopodit. 



One more word is to be added concerning Ausfraliosoiita. At- 

 tems, when re-describing Koch's A. f ra ii s re rfie-ti:eni at in)i , states : — 

 " Die Copulationsfiisse erinnern durch die tiefe Spaltung eher 

 an die von Leptodesmns.'''' But a main criterion escaped Attems' 

 attention, and that is how differently constructed are the coxae 

 of Strongylosomids and Leptodesmids. Nevertheless, a 

 similarity exists in the telopodit and is to be held as a highly 

 insti'uctive case of parallelism. From it we learn that, in 

 continental regions where a special group of Polydesmids seems 

 to find the most and more favorable conditions for their exist- 

 ence, the evolution tends to complicate the gonopods by 



>' Silvestri— Ann. Mus. Civ. Stor. Nat. Geneva (2), xiv., 1894-5, 

 p. 642. 



