490 On Aquatic Carnivorous Coleoptcra or Dytiscidce. 



rounded. Elytra narrow and elongate, rounded at the sides, narrowed and 

 acuminate behind, sparingly punctured, the punctures more distinct towards the 

 extremity than at the base ; abdomen terminated by a long pointed spine directed 

 backwards and upwards. 



Egypt — a suigle specimen, (probably from the neighbourhood of Cairo) sent by Dr. MiUingen. G03. 



658. Methles rectus, n. sp. — E,ufe3cen.s, sat nitidus, glaber, capite thoraceque fere 

 impunctatis; elytris sparsim sat fortiter punctatis ; subtus fere impunctatus ; 

 prothorace lateribus rectis, angulis posterioribus rectangulis. Long. Si, lat. If m.m. 



Closely allied to the preceding species, but rather larger and with the thora.K 

 quite straight at the sides ; the mucro terminating the body is much shorter, but 

 this may perhaps not be a specific character. 



Mesopotamia, also a discovery of Dr. Millingen's. 004. 



659. Methles punctipennis, n. sp. — Suboblongus, sat nitidus, glaber, capite thorace- 

 que fere impunctatis, hoc tamen versus latera punctis paucis ; elytris crebre fortiter 

 punctatis ; corpore subtus fere impunctato ; thorace lateribus paululum rotundatis, 

 angulis posterioribus obtuse rectis. Long. 3s, lat. lA m.m. 



Very similar indeed to the other two species, but with much more distinct 

 punctuation on the elytra. 



Tropical Africa, (Lagos, Ashautee). 605. 



in. 3.— Tribe COLYMBETIDES. 



Last abdominal stigma of small or moderate size ; outline of eye in front invaded 

 by the free margin of the clypeus, so that it is notched or emarginate not circular ; 

 feize moderate, 20 m.m. of length being attained by only three or four species. 



.Posterior femora with aggregated cilise arranged in a linear grouj) at the | AoAlilNI. 



postero-cxtemal angle. f (Vide p. i'3\.) 



Upper and inner edge of first ventral 1 



plate without transverse folds or I GeNER.\, 54 to 60. 



grooves: size rather below the aver- !- / f 7 r/>i \ 



, , , . . ,,, £ 1 ( I if/e p. 561.) 



age, rarely attaniing ill 111. m. of ' ' 



Posterior femora without aggregated ^ length. j 



ciliae at the postero-external angl 



Upper and inner edge of lirst ventral 1 



plate with transverse folds: size I CoLYMBETINI. 

 quite the average, usually attain- | ( Vide p. 605.) 

 ing 10 m.m. or more of lengtli. J 



