62 HYDRALEFilAGA DYTICIDiE. 



Haliplus; with an obscure tooth behind : legs slender, somewhat gressorial: 

 claws didaetyle. 



xcii. PiELOBius Ant. 1 1-jointed, inserted below the margin of the forehead : 

 scutel. distinct : body somewhat globose : legs gressorial : coxa slender : 

 claivs didaetyle. 



xeiii. Hyphidrus Ant. 11-jointed: max. palpi with terminal joint some- 

 what acute : scutel. wanting : body nearly globose : legs natatorial ; 4 

 anter. tarsi 4-jointed, nearly equal in both sexes ; the last joint short ; post. 

 tarsi compressed, with 1 moveable claw. 



xciv. Hygrotus Ant. 11-jointed: max. palpi with terminal joint swollen, 

 ovate-conic : scutel. wanting : body very convex : legs elongate ; 4 anter. 

 tarsi 4-jointed, nearly equal in both sexes ; post, pair 5-jointed ; claws 

 all didaetyle. 



xcv. Hydroporus Ant. 11 -jointed : max. palpi with terminal joint somewhat 

 cylindric, truncate: scutel. wanting : body depressed : legs slender; 4 anter. 

 tarsi 4-jointed, nearly equal in both sexes ; post, pair 5-jointed and slender, 

 with equal moveable claws. 



xcvi. Noterus Ant. U-jointed, fusiform (one or other of the central joints 

 dilated in the $ ) '• labial palpi with terminal joint very broad, notched at 

 the tip : body convex, narrowed behind : tlior. produced in the middle be- 

 hind : scutel. concealed : hinder tibice short ; tarsi all 5-jointed, posterior 

 with equal moveable claws : anter. tibia; of £ short, toothed within. 



xcvii. Laccophilus Ant. 11-jointed setaceous, slender: labial palpi with 

 terminal joint elongate, acuminate, bent : body flattish, acute : tho. pro- 

 duced in the middle behind : scutel. concealed : tarsi all 5-jointed, posterior 

 with unequal claws, the upper one porrect and fixed. 



xcviii. Colymbetes Ant. 1 1 -jointed, slender, setaceous : palpi filiform ; ext. 

 max. with 2d and 3d joints equal, 4th with the tip obtuse: scutel. distinct : 

 tarsi all 5-jointed; claws unequal, porrect, upper one mostly fixed, and 

 larger than the lower; 4 anter. tarsi of S with the 3 basal joints dilated. 



xeix. Agabus Ant. 11-jcinted (of the S with 8th — 10th joints compressed, 

 internally dilated and serrated, 11th small, acuminate) : ext. max. palpi 

 with 2d and 3d joints equal, the 4th subulate : scutel. distinct : tarsi all 

 5-jointed : claivs unequal ; didaetyle : anter. tarsi in <J slightly dilated. 



c. Hydaticus Ant. 11-jointed, setaceous: ext. max. palpi with 2d and 3d 

 joints unequal, 4th simulated : scutel. distinct: tarsi all 5-jointed: claivs 2, 

 unequal, upper one fixed : anter. tarsi in $ patellated, interm. dilated : tho. 

 wrinkled, and the elytra smooth in the 9. 



ei. Dyticus Ant. 11-jointed, setaceous: ext. max. palpi with 2d and 3d 

 joints equal, the terminal one rather obliquely truncate : scutel. distinct: 

 tarsi all 5-jointed ; with 2 equal moveable claws : anter. tarsi of J patel- 

 lated, interm. dilated at base : — 9. with elytra generally sulcated. 



pii. Cybister Ant. 11-jointed, setaceous: ext. max. palpi with 2d and 3d 

 joints equal, the 4th longer, a little dilated externally, truncate : scutel. dis- 

 tinct : tibice very short : tarsi all 5-jointed, post, monodactyle : anter. tarsi 

 of $ patellated ; interm. dilated : — 9. with elytra striated irregularly at 

 base. 



oii i. Acilius Ant. 11-jointed, setaceous: ext. max. palpi with 2d and 3d 

 joints unequal ; the 4th rounded at the top : scutel. distinct: tibia short : 

 tarsi all 5-jointed, post, didaetyle, the inner claw very minute : anter. tarsi 

 of c? patellated, interm. simple in both sexes : — 9 with the elytra suU 

 catv-d. 



90 Haliplus Latreille. 



473 elevatus Pz, F. xiv. f. 9. — Ste. M. ii. 39 Elongate, pale testaceous : 



