61 



STADENUS. 



Kostrum none. Antennae dentate. Thorax rather broad, with a 

 mesial lanceolate areolet. Elj'tra parallel, with four costae ; the in- 

 terstices with two lines of punctures, the lines divided by a very fine 

 costa. 



This genus is proposed for two Australian species. Porrostoma 

 dichroum, W., is the type. 



Stadenus dichrous. 



(Plate XV. fig. 5.) 



PoiTostoma dichroum, Watei-h., Trans. Ent. Soc, 1877, p. 86, pi. ii- 

 figs. 86, 87, and 1878, p. 102. 



Niger, opacus ; thorace late, excavato, triareolato, areola mediana 

 lanceolata ; elytris sordide flavis, apice nigris, quadricostatis, inter- 

 stitiis biseriatim punctatis. 5 . Long. 5 lin. 



Hab. King George's Sound. 



Thorax with the sides much reflexed, the central areolet not 

 reaching the anterior margin, but joined to it by a short carina. 

 Elytra parallel, rusty yellow, with the apical third black ; the in- 

 terstices of the elytra with two regular rows of distinct quadrangular 

 punctures, the rows divided by a very fine ridge. Body beneath 

 shining black ; legs dull. 



Stadenus inquinulus. 



(Plate XV. fig. 3.) 



Porrostoma inquinulum, Waterh., Trans. Ent. Soc, 1877, p. 81, 

 pi. ii. figs. 82-86. 



Ater ; elytris margine anguste apiceque late ferrugineis ; rostro 

 fere nullo ; thorace concavo, lateribus reflexis, disco areola lanceolata 

 instructo ; elytris quadricostatis, biseriatim reticulato-punctatis. 

 cf, 2 . Long. 5-5| lin. 



Hab. Australia. 



The costae of the elytra are distinct to the apex ; the interstices 

 have two rows of square punctures, the rows not distinctly divided 

 by a carina. The male has the penultimate segment of the abdomen 

 incised, and the antennae are more strongly dentate. 



ACHRAS. 



Rostrum none. Antennae dentate. Thorax small, with five 

 areolets. Elytra rather narrow at the base, gradually enlarged 

 posteriorly ; each elytron with four costae, the intervals with rugose 

 punctuation. 



