8TADKNU9. ACHRAS. 61 



STADENUS. 



Rostrum none. Antenna) dentate. Thorax rather broad, with a 

 mesial lanceolate arcolet. Elytra parallel, with four costae ; the in- 

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

 costa. 



This genus is proposed for two Australian species. Porrostoma 

 dichroum, \\\, is the type. 



Stademis dichrous. 



(Plate XV. fig. 5.) 



Porrostoma dichroum, Waterh., Trans. Ent. Soc, 1877, p. 86, pi. ri- 

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



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

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

 stitiis biseriatim punetatis. 5 • Long. 5 lin. 



Hob. 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 regidar 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 apieeque late ferrugineis ; rostro 



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



instructo ; elytris quadricostatis, biseriatim reticulato-punetatis. 



6 , 2 • Long. 5-5f lin. 



Hob. Australia. 



The costa) of the elytra are distinct to tho 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 antenna) are more strongly dentate. 



ACHRAS. 



Rostrum none. Antenna) dentate. Thorax small, with five 

 areolets. Elytra rather narrow at the base, gradually enlarged 

 posteriorly ; each elytron with four costa), the intervals with rugose 

 punctuation. 



