On I quatic Carnivorous Coleoptera or Dytiscidw. 



491 



II. 10. — Group Agabini. 



No stigmatic rugee ; that is to say, the semi-membranous piece bordering the 

 inner edge of the first ventral plate is smooth; wing of the metasternum reaching, 

 when the elytra are closed, as far outward as the margin of the epipleura. Hind 

 femur on the under surface with a group of cilise more or less developed, and situate 

 quite close to the hind margin at the outer part of the femur. Side piece of the 

 fourth and following ventral segments rather broad, (the length of the fourth being 

 only about twice its breadth). 



The character by which a member of this group may be mo^t readily recognised 

 is the group of cilite at the angle of the hind femur. Ten genera are included in 

 the Agabini and they may readily be discriminated by the following table: 



a 



13 







.^ o 

 S s 



" o 



O 



^ ■— - 



P 'S 



o 



Ph 



.a 



03 



C3 

 M 

 o 

 O 



Palpi with theu- terminal joint dilated ; that of the \ 

 labial veiy large and subquadrate. j 





O 5^ OJ S 







^ « 



Coxal lines very deep and 

 nearly straight. 



Coxal lines fine, sinuate. 



Epipleurse continuing rather broad 1 

 after the middle of -wing-case, i 



60 



a 



2 .;2 o 



^- 



ft 



'Swimming legs short and 

 stout ; thorax slightly 

 margined at sides ; upper 

 surface convex; size large 

 (12 m.m. long.) 



Swimming legs rather slen-~ 

 der ; thorax margined at 

 sides ; upper surface 

 rather flat ; size rather 

 small (8 m.m. long.) ^ 



Thoi'ax not margined at i 

 sides. I 



o " 



O o 



Hind coxa very large. 



■% I 



Hind coxa small. 



HYDROTRUPES. 

 {Videi>. 492.) 



AGABINUS. 

 iVide^. 548.) 



AGABUS. 

 (Vide p. 493.) 



PLAT AMBUS. 

 ( Vide p. 548.) 



ILYBIUSOMA. 

 (Vide IX 537.) 



PLATYNEGTES. 

 (Vide\x 5.38.) 



LEURONECTES. 

 (Vide p. 546.) 



AGAMETRUS. 

 (Vide -p. 547.) 



METRONECTES 

 (Vide -p. 492.) 



Posterior tarsi with their claws decidedly unequal ; and with 1 



the lower part of the hind margin of their joints, on the outer l ILlBlUh. 



face, produced or lobed. j ( '^'^^ V- 550.) 



TBAN3. BOV. DUB. SOC, N.S., VOL. U, 



3 S 



