STABKNUS. ACURAS. (31 



STADENUS. 



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

 mesial lanceolate areolet. Elytra parallel, with four costse ; 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.) 



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

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



Niger, opacus ; thorace lato, excavate, triareolato, areola mediana 

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

 stitiis biseriatim punctatis. $ . 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 Avith 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. Enl. Soc, 1877, p. 81, 

 pi. ii. figs. 82-86. 



Ater ; elytris margine anguste apiceque late ferrugineis ; rostro 

 fere nullo ; thorace concave, lateribus retlexis, disco areola lanceolata 

 instructo ; elytris quadricostatis, biseriatim reticulato-punctatis. 

 cJ , 5 . Long. 5-5| lin. 



Hab. Australia. 



The costse 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, /intennaj 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. 



