107 



Periplaxeta invisa, Walker (ibid, 137). 

 " Resembling P.fortipes. Head with reddish labrum. Supra- 

 anal lamina emarginate. CoxaB bordered with yellow. 



Length of body (both sexes)... ... 27-32 mm. 



Habitat.— A\xsiYc\\\B. (N.S.W. ?) ; West Australia." 



Periplaxeta glabra, Walker (ibid, 139). 

 " Deep black, oval, convex, smooth, shining. Antennae black* 

 Pronotum rounded laterally, hindmargin straight. Metanotum 

 with angles slightly produced. Elytra triangular, corneous, 

 rudimentary. Legs short. Abdominal segments with the angles 

 successively more elongated, acute. Supra-anal lamina bilobed, 

 lobes tetragonal. Cerci fusiform, flat Styles long, slender. 

 Length of body (male) ... ... ... 18 mui. 



Sahita t. — Australia. " 



There are three female specimens in the collection of the S.A, 

 Museum, which I refer to this species, and from which the 

 following description is drawn up : — 



Deep black, narrowly fusiform, very convex and shining, hind- 

 margins of segments narrowly lurid. Head and antenna? black ; 

 ocelliform spots, margins of clypeus and labrum, also palpi, very 

 pale. Thoracic segments laterally narrowly reflexed ; disk 

 polished, with distant impressed dots, hindmargin of metanotum 

 convex. Elytra absent. Underside and legs dark piceous, tarsi 

 and spines brown ; claws pale. Abdominal segments angular, 

 posterior ones produced, acute, hindmargin scabrous, minutely 

 dotted. Supra-anal lamina tapering, deeply emarginate, angles 

 rounded. Cerci nearly twice as long as lamina, lanceolate, thick, 

 acute, black. 



Female. 

 Length of body ... ... ... 15 mm. 



Length of j^ronotum ... ... ... 4*5 " 



Width of pronotum ... ... ... 6 " 



Width of abdomen 8 " 



Habitat. — Northern Territory of South Australia. S.A. 

 Museum, presented by the Hon. Dr. S. J. Magarey. 



Periplaxeta obscura, s/). nov. 

 Resembling the preceding ; dull black-brown to black. Head, 

 antennae, and mouth parts reddish. Pronotum smooth, with a few 

 impressed dots. Meso- and meta-notum, also abdomen, thickly 

 and minutely tuberculate. Elytra lobiform, not exceeding the 

 mesonotum. Legs short, stout, hind tibia? short, entirely deep 

 reddish-brown. Supra-anal lamina comi^ressed, emarginate. 

 Cerci broad, lanceolate, acute. 



