462 STUDIES IN AUSTRALIAN BNTOMOLOGY, xvii., 



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humeral angles marked, but not dentate. Mesepisterna punc- 

 tate; metepisterna broader than long. Two basal, ventral seg- 

 ments punctate; apical segment in ^ with two widely placed, 

 small, setigerous punctures; in 9 with four, setigerous punctures 

 near apical margin. Length, 7; breadth, 2"75-3 mm. 



J/ab. — Western Australia : Manjimup. Type in Coll. Sloane. 



I found this species in the Karri Forest, 14 miles from Man- 

 jimup Railway-Station; it is the smallest species of the genus. 

 Its position is beside C. gibbosus Chaud., from which it differs 

 bv smaller size, narrower and less convex form, etc. 



Genus P h o R t i c s m u s . 



Before describing any new species, it is necessary to review 

 the described species of the genus Phorticosomus. Ph. rotundi- 

 pennis Cast., Ph. lateralis Cast., and Ph. minutus Cast., do not 

 belong to the genus. Ph. rotundipennis seems to be a species of 

 Simodoiitns, which may be identical with the species I named *S'. 

 mandibularis; but this cannot be settled, till specimens from the 

 Paroo River can be examined. Ph. lateralis is a species of 

 Mecyclothorax. Ph. minutus, from the Paroo River, has been 

 examined by Chaudoir, who referred it to Simodontus; but the 

 description seems, to me, to have been founded on a species of 

 Mecyclothorax closely allied to M.fortis Blkb. 



Ph. graiidis Cast., length 9 lines, from Cooper's Creek, has the 

 prothorax with the anterior angles advanced, and the posterior 

 angles sharply rectangular. I have identified this species as one 

 found by Mr. Zietz at Lake Callabonna. Specimens, given to 

 me by Mr. French, as from Onslow, N.W. Australia, seem to be 

 conspecific. 



Ph. edeli Cast., I identify as a large species given to me by 

 Mr. H. M. Giles, who found it on the Strelley River, N.W. Aus- 

 tralia. Prothorax somewhat similar in shape to that of Ph. 

 grandis Cast., but basal angles obtuse (though marked), apex 

 (5*6 mm.) wider than base (5 mm.). Length, 19-5 mm. It seems 

 widely spread; specimens in my collection, from Kalgoorlie, W.A., 

 and Barrow Creek in the Northern Territory, on the overland 

 telegraph-line, cannot be regardftl as different from the specimen 

 from Strelley River. 



