550 REVISION OF THE GENERA COLPOCHILA, ETC., 



fortiter rugulose Hiis evidenter 4-costatis, interstitiis trans- 

 versim rugulosis) punctulatis ; clypeo antice sequaliter 

 rotundato sat fortiter reflexo ; capite postice sat tumido, 

 corpore subtus sat fortiter minus crebre punctulato, sternis 

 femoribusque pilis sparsis subfulvis vestitis ; tibiis anticis 

 extus sat fortiter tridentatis, dente femori proximo quam 2"^ 

 dimidio minore ; tarsorum posticorum articulo 1° 2° vix 

 breviori ; tarsis subtus baud lineatim setigeris ; antennis 

 8-articiilatis, flabello stipite paullo longiori ; abdominis seg- 

 mento ultimo late vix emarginato, apice subreflexo. 



[Long. 4f , lat. 2f lines (vix). 

 ^. Latior ; postice magis dilatata ; rufo-ferruginea, Ciipite 

 obscuriori ; antennarum flabello stipite breviori ; abdominis 

 segmento ultimo baud emarginato apice vix reflexo. 



[Long. 4I-5J-, lat. 2f-2± lines. 



The pi'othorax has scarcely an indication of a channel down the 

 middle ; it is a little more than half again as wide as long, its base 

 (which is feebly bisinuate) being about half again as wide as the 

 front which is deeply emarginate with sharp and well produced 

 angles ; it is widest a little behind the middle ; the sides are 

 moderately rounded ; the hind angles are much rounded but not 

 quite non-existent. The puncturation of the undex'side is moderately 

 large but neither close nor deep ; it is finer than elsewhere on the 

 ventral segments, where in some specimens (usually females) it is 

 somewhat obsolete. 



This species is no doubt allied to S. languida, Er., which however 

 is said to be " pruinose," and to have its scutellum lajvigate (the 

 puncturation of the scutellum is not invai'iable in S. dispar, but I 

 have seen no example in which it is quite Ijevigate) and the 

 posterior angles of the prothorax " acutiusculi." From the 

 analogy of S. erosa there is perhaps a doubt whether the variation 

 of colour is always sexual, — though I have found it so in the 

 specimens, — about a dozen, — that I have examined. 



Port Lincoln. 



