260 Mr. R> Shelford's Studies of the Blattidae 



5. P. impressa, Tepp. 



Polyzosteria impressa, Tepper[w] Horn Exped. Ceutr. 

 Australia, ii, p. 361 (1896). 



Known to me only from the description which I repro- 

 duce herewith. 



" 5 . Metallic blackish glaucous ; fore- and hind-margin of prono- 

 tum ami the hiud-margins of all the other segments narrowly yellow. 

 Face, antennae, legs (except ochreous coxae) and ventral segments of 

 abdomen, brownish-red. Vertex of head dull metallic green, punc- 

 tate ; fore margin of clypeus whitish. Pronotum hooded, lateral 

 margin broad, refiexed, impressed cribriform, rugulose, hind-angles 

 moderately rounded ; discal area limited by a semicircular inter- 

 rupted impression, in front a low elevation succeeded by an inversely 

 curved depression, and on each side of the middle an elongated pit ; 

 hind-margin concave. Meso- and meta-notum with similar sculpture 

 and transverse impressions ; hind-angles of former distinctly produced, 

 hind-margin straight ; of latter, hind-angles]not produced, hind-mar- 

 gin very sinuous. Abdomen short, very slightly rugulose, margin 

 of last two segments finely crenulate and hind-angles produced ; lat 

 ventral segment and coxae bordered pale. Supra-anal , lamina very 

 flat and short, rotundate, entire, rugulose. Cerci very short, acumi- 

 nate, pale yellow. 



Tota,l length 28 mm. ; pronotum 8 mm. x 18 mm." 



Central Australia. 



6. P. ohsctiroviridis, Tepp. 



Polyzosteria ohscuroviridis, Tepper, Tr. R, Soc. S. Aus- 

 tralia, xvii, p. 73 (1893). 



Unknown to rae ; it is distinguished by the pronotum, 

 " studded with irregular rows of large raised tubercles " 

 and by the bicolorous legs. 



South Australia, Gawler range. (Adelaide Mus., 

 type.) 



7. P. imlescens, Tepp. (Plate VII, fig. 1). 



Polyzosteria puhescens, Tepper, t. c, p. 75 (1893) ; Frog- 

 gatt, Australian Insects, p. 19, fig. 6 (1907). 



Fuscous, with a greenish tinge, all the tergites very narrowly 

 bordered posteriorly with testaceous. Dorsal surface with a dense 



