544 PROCEEDINGS OF THE NATIONAL MUSEUM. voj,. xxvii. 



Genus ELLIPSIDION Saussure. 



1864. Ell.ipsidioii iSaussure, Melanges Orthopterologiques, I, p. 18. 

 . Apolyta Brunner, Nouv, Syst. Blatt., p. 112, 1865. 



Ti/pe. — Tkymocera amtralis Saxissure — Ajwlt/f a, pellucida Braiiner. 



ELLIPSIDION HISTRIONICUM, new species. 



Ty^^.— Male; Australia. (Koebele.) [Cat. No. B946, U.S.N.M.] 

 Apparently allied to ^. australe Saussure" (^ jpelhiGida Brunner) 

 and E. qumlripmictatmn Tepper.^ From the former it differs in the 

 truncate posterior margin and general shape of the pronotum, the 

 longer antenna^, and the brownish instead of blackish limbs. From 

 quadripnnctatam it differs in the larger size and the indefinite char- 

 acter of the maculations on the pronotum. 



Size medium; form ovoid, the apex posterior. Head slightly pro- 

 jecting beyond the pronotum, anteriorly truncate; interspace between 

 the eyes exceeding the long diameter of one of the latter; eyes reni- 

 form; lower surface of head deplanate; antenna? about equal to the 

 body in length, closely and densely plumose. Pronotum transverse, 

 subovate; anterior margin narrow, truncate; posterior margin trun- 

 cate, about twice the width of the anterior margin; lateral margins 

 obtuse angulate, anterior angle well rounded, posterior angle broadly 

 obtuse; pronotum as a whole arched transversely. Tegmina elongate, 

 subparallel, extending a considerable distance beyond the tip of the 

 abdomen; apex bluntly angulate; basal field equal to one-third the^ 

 length of the tegmina, coriaceous in character; discoidal vein arcuate; 

 basally, extending to the apex of the tegmen, costal veins regularly 

 disposed, diagonal; anal sulcus arcuate basally, anal field subpyriform. 

 Wings equal to the tegmina in length when in repose; apex narrowly 

 rounded, costal margin arcuate, proximal costal veins apically incras- 

 sate; ulnar vein with five complete rami. Abdomen with the lateral 

 angles of the segments slightly produced posteriorly. Supra-anal plate 

 broad, shallow, triangularly produced, apex with a shallow V-shaped 

 fissure. Cerci lanceolate, depressed, apex acuminate. Subgenital 

 plate triangularly produced, apex deeply and narrowly fissate.. 

 Anterior femora with one large apical spine on the external margin;; 

 posterior margin with three spines in the distal half, the apical one 

 largest, genicular spine large; tibiffi not equal to the femora, but 

 equaling the tarsi in length. Median femora with seven spines on 

 the anterior margin, the apical one surpassing the others in size, pos- 

 terior margin with five spines, the apical surpassing the others, gen- 

 icular spine strong; tibia? very slightly shorter than the femora; tarsi 

 slightly shorter than the tibite. Posterior femora with the anterior 



« Melanges Orthopterologiques, I, p. 18. 



^Trans. and Proc. and Rep. Royal Soc. South Aust., XVII, p. 45. 



