1883.] M. JACOBY ON NEW Sl'ECIES OF BEETLES. 405 



part of the face fulvous. Antennae fulvous or piceous. Thorax 

 transverse, narrowed from the base to the apex, the sides nearly 

 straight and longitudinally flattened ; surface very finely punctured 

 at the disk, the latter black, the sides with a metallic green gloss. 

 Scutellum black. Elytra rather convex, slightly but distinctly 

 widened towards the apex, very closely punctured, the interstices 

 finely rugose, of a metallic greeu or blue colour. Entire underside 

 and the legs fulvous. 



Hub. East Africa (coll. Jacoby) ; Zanzibar (coll. R. Oberthiir). 



Closely allied to P. smaragdiiia, Clark ; but at once separated by 

 the black colour of the thorax and of the scutellum. Tlie elytra 

 show no trace of longitudinal costse as is sometimes seen in the allied 

 species. The present insect is also larger, and the antennae are more 

 filiform. The specimens contained in my collection and in that of 

 M. Oberthiir are all females. I may further add that the thorax of 

 P. smaragdhia is much more strongly punctured, and that Clark 

 gives the colour of the entire insect as metallic green or a)neous, which 

 is a mistake, the underside being of the same colour as that of the 

 present insect. 



Systena, Clark. 



12. Systena discoidalis, sp. nov. (Plate XLV. fig. 12.) 



Elongate, flavous ; head and thorax impunctate ; elytra extremely, 

 finely punctured, their posterior two thirds black, tiie latter aoc 

 extending to the margins. 



Length 3^ lines. 



Hab. Ecuador. 



Head entirely impunctate ; the frontal tubercles rather obsolete 

 and divided by a very shallow groove ; carina indistinct ; lower part 

 of face depressed. Jaws black at their apex. Antenme half the 

 length of the body, filiform, entirely pale fulvous ; all the joints, 

 with the exception of the short second one, of nearly equal length. 

 Thorax nearly twice as broad as long, subquadrate, the sides obliquely 

 shaped, forming a distinct angle before the middle ; anterior and 

 posterior angles rather rounded ; surface with a rather deep trans- 

 verse sinuate groove in front of the base, the sides of which are 

 gradually lost near the lateral margins ; disk impunctate. Scutellunr 

 broadly triangular. Elytra wider than the thorax, subdepressed, 

 slightly widened towards the middle, with a shallow sutural depres- 

 sion below the base, very finely and closely punctured, flavous, with 

 an oval-shaped black patch extending from below the base to the 

 apex, but leaving all the margins of the ground-colour. Posterior 

 femora moderately thickened ; their tibiae with a distinct spine. 



A single specimen, collected by Mr. Buckley, contained in my 

 collection. 



From the typical species forming the genus Systena, which are 

 known to me, the present one deviates somewhat bv the rather deep 

 thoracic groove, the peculiar coloration, and its size ; in all other 

 structural characters, including the closed anterior coxal cavities, it 

 agrees with the rest. 



