136 



mandibulisque noiinihil obscurioribus ; his minus elongatis 

 minus latis, ad latera vix angulatis, cetera ut P. intermedii, 

 Blackb.; processubus jugularibus fere ut P. inter medii sed 

 sinistro externe inerrai ; capite fere ut P. intermedii sed 

 paullo minus lato ; anteanis quam P. intermedii pauUo 

 gracilioribus vix brevioribus, articulis 3" quam latiori vix 

 longiori 10° manifeste traasverso ; prothorace vix trans- 

 verso, antice subangustato, cetera ut P. intermedii; elytris 

 fere ut P. intermedii sed pone Immeros vix perspicue 

 depressis. Long., 3i 1.; lat , t 1. 

 This species is so like P. inter7nedius (of the same sex) that it 

 seems unnecessary to repeat the diagnosis of that species in all 

 its details ; it may be read as the diagnosis of P. gladiator 

 subject to the quahfications specified above. Compared with 

 i?itermedius (female) the mandibles are distinctly shorter (the 

 left one not much longer than the distance from the clypeal 

 suture to the transverse sulcus) and scarcely angulate externally, 

 the left jugular process has no external tooth, the antennae are 

 more slender with the third joint distinctly shorter and the tenth 

 a trifle more transverse, the head is very evidently narrower 

 and more convex, the prothorax is very conspicuously narrower 

 with its front decidedly narrower than its base, and the elytra 

 are almost without any post-humeral impression and also are less 

 narrowed behind. It was on the authority of this insect that in 

 my original description of P. intermedins I gave N.S. Wales as a 

 habitat, thinking that the differences between intermedius and 

 gladiator might be sexual — which, however, I now know they 

 are not. 



N.S. Wales (Blue Mountains); given to me by the late Mr. 

 OUiff. 



Tabulation- of the Described Australian Species of 

 Prostomis. 



A. Jugular processes invisible from above. 

 B. Left jugular process acute at apex. 



C. Left jugular process toothed externally before 



the apex ... ... ... ... intermedius, '^\Q,c]s\i. 



CO. Left jugular process unarmed externally ... gladiator, Blackb. 

 BB. Left jugular process dilated and truncate at 



apex ... ... ... ... ••• Athinsoni, Waterh. ? 



A A.. Jugular processes visible from above ... cornutm,WaXevh. 



ipsaphes. 

 This name cannot stand, as it is undoubtedly a synonym of 

 Platysus — indeed T have no doubt of /. mcerosus, Pasc. (the 

 type of Ipsaphes), being even specifically identical with 

 P. obscurus, Er. (the type of Platisus). Pascoe's action in 

 founding Ipsaphes is incomprehensible since the most noteworth y 



