466 STUDIES IN AUSTRALIAN ENTOMOLOGY, xvii., 



humeral angles; lateral channel narrow. Anterior tibiae with 

 outer angle produced into a strong, triangular spur, outer edge 

 crenulate above apical spur; posterior trochanters reniforra, ex- 

 ternal side arcuate, several punctures on basal half. Length, 

 14-5-16; breadth, 5-8-6-1 mm. 



Hah. — S.A.: Nooriootpa. Type in Australian Museum. Six 

 specimens have been examined, one is now in Coll. National 

 Museum, Melbourne, and one is in my collection. 



From description, it seems to resemble Ph. rohustus Blkb., 

 (unknown to me in nature) but is larger, and has not the sides 

 "strongly sinuated before hind angles." From Ph. horni SI., it 

 differs decidedly by the smaller size; more sharply marked, pos- 

 terior angles of prothorax ; elytra with border less raised at 

 humeral angles; posterior trochanters with posterior side not 

 straight, apex not widely truncate. From Ph felix Sch., and 

 Ph. randalli Blkb., it differs, inter alia, by size larger, basal 

 angles of prothorax more strongly marked. From Ph. graridis 

 Cast., Ph. nuytsi Cast., and Ph. mucro7iatus Blkb., it differs in 

 various ways, but from all of them by prothorax with anterior 

 angles^ not prominent, lateral margins not wide and flat at basal 

 angles. 



Mr. H. W. Brown brought, from Cue, a species which has the 

 prothorax almost exactly as in Ph. piceus, though the posterior 

 angles are a little more obtuse; it is probably conspecific with 

 Ph. piceus. 



Phorticosomus castelnaui, n.sp. 



Robust, convex, Prothorax subcordate, narrower across base 

 (4 '5 mm.) than apex (5 -5 mm.), anterior angles strongly advanced, 

 basal angles rectangular; elytra truncate at base, humeral angles 

 marked. Black, antennae piceous. 



Prothorax transverse (4 x 6*7 mm,), strongly narrowed to base, 

 depressed along posterior margin; apex truncate between anterior 

 angles, these prominent, obtuse; sides lightly rounded, subsinuate 

 just before base; basal angles rectangular, obtuse at summit: 

 base emarginate above peduncle; margins wide, explanate near 



