BY ARTHUR M. LEA. 



463 



Genus Illidgea Lea, I.e. p. 92. 

 Illidgea 16-tuberculata Lea, I.e., p. 93 

 Hab. — Queensland and New South Wales. 

 Genus Omydaus Pascoe, Journ. Linn. Soc, 1871, p. 198. 

 Head moderately large. Eyes ovate, finely or moderately 

 faceted. Rostrum moderately long and rather thin. Scape the 

 length of or slightly shorter than funicle. Prothorax slightly trans- 

 verse,* base bisinuate. Scutellum small. Elytra not much wider 

 than and about twice the length of prothorax, base trisinuate, 

 shoulders produced. Mesosternal receptacle raised in front, as long- 

 as wide, sides incurved to base; cavernous. Met asternal episterna 

 distinct throughout. Abdomen rather large, sutures deep and 

 straight. Legs rather short and stout ; femora stout, the front ones 

 acutely, the others feebly dentate. Subelliptic, squamose, non- 

 tuberculate, apterous. 



Apparently allied to Metlndrysis, but the head not foveate, and 

 the antennae very different, and it is probably allied to Poropterus, 

 although (as pointed out by Mr. Pascoe), the metathoracic epi- 

 sterna are distinct. The colour of all the species is an opaque 

 black, with the antennae, and claw-joints dingy red; they all have 

 a distinct median prothoracie carina, and usually the head is cari- 

 nate ; the clothing appears to be easily abraded. 

 Abdomen with second segment decidedly elevated above third. 



Posterior angles of prothorax produced suh/asciculatus. 



Posterior angles almost rectangular contraction. 



Abdominal segments level. 



Prothorax longer than wide impressirollis. 



Prothorax transverse. 



Alternate interstices of elytra elevated fuliginosus. 



Alternate interstices scarcely visibly elevated. 



Large punctures of elytra clearly defined oblongopunctatns. 



Large punctures of elytra more or less confluent... confusus. 



Omydaus fuliginosus Boisd.; Mast. Cat., Sp.No.5472. 

 Cryptorhyiichus fuliginosus Boisd.; Acalles immansuetus Boh.; 

 Omydaus plinthoides Pasc. 



Rather sparsely clothed with stout ochreous and sooty scales, 

 each (except some on elytra) set in a puncture. 



* In 0. impressicollis, it is slightly longer than wide. 



