BY F. W. CODING. 31 



Tegmina destitute of transverse venule between two ulnar 

 veins, near base, with five oblong apical and two discoidal cells, 

 the interior petiolate; costal cell extended beyond radial, both 

 punctured and opaque; exterior discoidal cell not petiolate; clavus 

 punctured and opaque at base, with two veins, gradually narrowed 

 to apex. 



Wings with four apical cells. 



Scutelluifa transverse, almost equally long and wide, apex trun- 

 cated, ending on each side in a little tooth. 



Tibiae and tarsi simple (in one species dilated). 



Type, Centrotus Tasmanice, Fairm. 



Synopsis of Species. 



1 (4). Lateral horns nearly erect; apex of posterior process not 



passing tips of tegmina ; head triangular ; tibiae not 

 dilated. 



2 (3), Corium furnished with a longitudinal, ferruginous stripe 



along middle from base to apex ; third apical cell 

 normal vitta. 



3 (2). Corium smoky yellow, destitute of ferruginous stripe ; 



third apical cell furnished with transverse venules Tasmania. 



4 (1). Lateral horns inclined forward; apex of posterior process 



far surpassing tips of tegmina; head nearly square, 



lateral borders foliaceous; front tibiae dilated gracilis. 



*D. TASMANiiE, Fairm. 



(Plate i., figs. 6 and 20). 



1846, Centrotus Tasmanice, Ann. Soc. Ent. Fr. (2), iv. p. 513, 



pi. 3, fig. 15. 

 1851, Centrotus contractus, Walk., List Horn. Brit. Mus. p. 622. 

 1858, Centrotus truncaticoi^nis, Walk., Ins. Saunds. Horn. p. 81. 



Head black, triangular, apex a little recurved; ocelli on a line 

 with centre of eyes, and a little further from each other than 

 from the eyes. 



Prothorax dark ferruginous brown, punctured, rising verticall}' 

 from base, lateral horns strong, upright, a little diverging, some- 

 what constricted along middle, dilated at the apex, which is 



