636 STUDIES IN AUSTRALIAN ENTOMOLOGY, NO. XII., 



biimpressed ; spaces between frontal impressions and base of 

 antennae narrow, convex; eyes large, convex, ^Drominent. Pro- 

 thorax transverse, subquadrate, widest rather before middle; sides 

 lightly rounded, hardly narrowed to base ; basal angles obtuse 

 but a little marked; base truncate; border narrow, reflexed. 

 Elytra ovate, widely and evenly rounded on apical curve; striae 

 obsolescent, only three inner ones faintly marked between 1st and 

 2nd discoidal punctures, 3rd interstice 3-punctate, 8th detaching 

 itself from marginal channel about basal fourth, enclosing a wide, 

 slightly raised interstice on apical curve. Length 3-1, breadth 

 1-35 mm. 



Hah. — Q. : Mackay (given to me by Mr. C. French ; Coll. 

 Sloane). 



Differs from the other two Australian species by smaller size 

 and paler colour. The mandibles and labrum are pale-coloured. 



Tribe LEBIINI. 



Pentagonica dichroa, n.sp. 



Head black ; prothorax yellow, margin more pallid ; elytra 

 sericeous-black, a narrow testaceous margin on sides; body black; 

 legs pallid ; antennae fuscous, joints 2-4 lighter-coloured than 

 others. Head convex, wide (1"25 mm. across eyes); neck condy- 

 liform. Antennae with four basal joints glabrous, basal joint long 

 and stout, nearly as long as two succeeding joints together; joints 

 2-4 cylindrical, second shortest, a little more than J length of 

 3rd, — this J longer than 4th and \ shorter than 5th. ^ Prothorax 

 transverse (0-9 x 1*5 mm.), convex (basal part depressed), widest 



* The attention of students using Lacorclaire's ' Genera ' may be drawn to 

 the erroneous manner in which the basal joints of the antennee of Pentagonica 

 are there described (after Schmidt- Goebel), what is called the 1st joint being 

 merely the basal condyle of the 1st joint. JJni^ex Bhoiiihodera (Reiche) in 

 the ' Genera ' will be found a good description of the basal joints of the 

 antennae in Pentagonica, with which it is synonymous. Le Conte's descrip- 

 tion of the antennae of Didetus (synonymous with Pentagonica) as quoted in 

 the ' Genera ' is poor; he describes the 4th joint as moderately pubescent, in 

 P. dichroa I consider the 4th joint maybe called glabrous without inaccuracy. 



