146 REV. T. E. E. STEBBING ON A 



abdominal segments, hidden under the thoracic carapace, as de- 

 tailed in their account given in the ' Annales des Sciences Natu- 

 relles ' for 1872, article 7, sufficient to bear them out in their 

 "preuves peremptoires " that the creatures are insects, and quite 

 analogous to the branchial plates of Ephemeridse. Having inci- 

 dentally mentioned Prosopisto^na, I thought it right to enter into 

 the question of its relations according to the researches of the 

 French entomologists, especially as, at one time, I had expressed 

 myself uncertain as to the correctness of their deductions. 



EXPLANATION OF PLATE V. 



Fig. 1. Male imago ; 1 a, underside of apex of abdomen; 1 b, appendages and 

 penis, from beneath. 



2. Female imago. 



3. Female subimago. 



4. Portion of " larva ;'' 4 a, antenna of the same. 



5. "Nymph " nearly mature ; 5 «, leg ; 5 b, brancliial plate ; 5 c, labrum ; 



5 d, maxilla, with palpus and mandible, seen from above ; 5 e, the same, 

 seen from beneath ; 5/, labium and palpi ; b g, apex of abdomen, from 

 beneath. 



A new Australian Spha>romid, Cyclura venosa; and notes on Dy- 

 namene rubra and viridis. By the Eev. T. E. E. Stebbinq, 

 M.A., of Tor-Crest Hall, Torquay. (Communicated by AV. W. 

 Saundeks, Esq., F.E.S., V.P.L.S.) 



[Bead May 7, 1874.] 



(Plates VI. & VII.) 



The Sphseromid figured in the accompanying Plate appears to 

 belong to a new genus of that family. It was "found under 

 stones in Sidney harbour, in society, at the lowest ebb tides," by 

 Mr. Stevenson, when collecting in Australia some years ago for 

 W. "Wilson Saunders, Esq., E.E.S., from whom I received the 

 specimen. 



The generic character consists in the attachment of the inner 

 plate of the uropoda to a tooth which projects both forwards and 

 upwards from the extremity of the tail, and in the extension of 

 both plates of the uropoda beyond this projecting tooth, the outer 

 plate folding partially beneath the inner, but extending beyond it. 



It agrees with the Australian species Ci/modocea armata in the 

 prolongation of the seventh segment of the body over the tail. 

 This process in the species now under description is not unlike 



