290 Mr. R. Shelford's Studiefi of the Blattidae. 



between the Polyzosteria-group and the BlaUa-groinp, on 

 account of the tarsal structure (PI. IX, fig. 40^). 



KEY TO THE SPECIES. 



1 . Piceous or castaneous. 

 2. Piceous. Legs piceous. Broad convex 



species G. nititln, Br. 



2'. Castaneous. Legs testaceous. Narrow, 



sub-depressed species C. melanesiae, sp. n. 



r. Testaceous or ferruginous. 



2. Disc of pronotuni with three fuscous 



markings arranged in a ti'iangle . . . C. Irianr/ulatd, Br. 

 2'. Pronotum with more or less distinct 

 fuscous lateral vittae. 

 .3. Species exceeding 13 mm. in length. 

 4. Posterior angles of distal abdominal 



tergites ( (J ) produced C. /ip;/f7cu/«Hrt, Sauss. 



4'. Posterior angles of distal abdominal 



tergites ((^ ) not produced . . . C. sedilluti, V>o\. 

 3'. Species not exceeding 13 mm. in 



length C. bnoini, A\ik. 



1. C 'liitldu, Br. 



Folyzostcria nitida, Brunner von Wattenwyl, Nouv. 



Syst. Blatt., p. 214 (18(35). 

 Periplanda jwlita, Walker, Cat. Blatt. Brit. Mus., 



p. 139 (1868). 

 Ctdilia tartarca, Stal, Oefv. Vet. Akad. Forh., xxxiv 



(10), p. 36 (1877). 

 ? Bkdta atcrriina, Escholtz, Entomographien, p. 89 



(1822). 



This species, which is very variable in size, has a wide 

 range outside Australia; the record of its occurrence in 

 Australia is doubtful. I do not know whether Escholtz's 

 type is i)reserved and his species may not perhaps have 

 tlie slightest affinity with nitidn, for the description is too 

 brief for it to be possible to judge of that. 



Formosa (British Mus., type of 2:)olita) ; Philippines 

 (Stockhohn Mus., type of tartarca ; British Mus.) ; Borneo 

 (Oxford Mus.; Paris Mus.); Ternate (British Mus.); 

 Amboina (Vienna Mus., type oi nitida] Oxford Mus.); New 

 Guinea (Oxford Mus. ; Brussels Mus. ; Melbourne Mus.) ; 



