In the long inner spur of the hind tibia and other crural characters 

 punctatus and aeruginosus differ notably from all other known species 

 of Agabus, so much so that Sharp assigned them to a separate group 

 (Group 6) in his treatment of the genus. 



A. triton new species. 



Rather broadly oval, strongly convex, general color dark rufopiceous or castane- 

 ous, the margins more rufous, surface strongly shining in both sexes. Head 

 piceous, epistoma and two vertex spots rufous. Prothorax with rufous sides, the 

 disk broadly blackish. Elytra with the disk broadly rufopiceous or dark chestnut, 

 becoming gradually paler at base and sides. Body beneath blackish, the abdomen 

 medio-basally and the apices of the segments more or less rufous. Antennae, 

 prosternum, epipleura and legs rufous, the femora, especially of the hind legs, 

 often a little dusky. Entire upper surface finely and feebly reticulate, the elytral 

 areolae small and irregular. The three series of elytral punctures are distinct 

 but considerably confused, and there is a system of scattered minute punctures 

 occupying the intersections of the network. The outline of the thorax and 

 elytra is nearly continuous ; the prosternal process is of moderate length, sub- 

 compresso-carinate ; the hind thighs are slightly produced at their apical angle 

 and are almost destitute of the stiff bristle bearing erosion at the angle which is 

 so generally and characteristically present in this genus; the hind tibiae have a 

 series of coarse punctures along both the inner and outer margins. The four 

 anterior tarsi of the male are moderately strongly incrassate and clothed beneath 

 with glandular hairs which bear rather large palettes. The claws of the front 

 tarsi (d 1 ) are short, the posterior one regularly curved and acute at tip, the an- 

 terior one thickened and of sensibly uniform width from the basal dilation to the 

 obtusely truncate apex. In the female the protarsal claws are simple and like 

 those of the mesotarsi. Length 6.5 to 7.5 mm.; width 3.7 to 4.3 mm. 



Described from a series of eight examples from Edmonton, Alberta 

 (April 12, 1917 F. S. Carr) and Winnipeg, Manitoba (April 17, 

 1911 J. B. Wallis). The type, a male from the first named locality, 

 is in the writer's collection. 



This species bears a very striking general resemblance to punctatus, 

 but is abundantly distinct in its greater convexity, compresso-convex 

 prosternal process, inner margin of hind tibiae punctate, much shorter 

 posterior tibial spurs and differently formed anterior protarsal claw 

 of male. 



A. punctulatus Aube, Spec. Gen. 1838, p. 332 



ae'neolus Cr. Trans. Am. Ent. Soc. IV, 1873, p. 417. 

 Size very small, form evenly oval ; prothorax piceous with paler side margins ; 

 elytra rufotestaceous or yellowish brown, the disk broadly more or less infuscate 

 and usually with distinct aeneous lustre ; body beneath piceous, the antennae, legs 

 and epipleura rufous. Surface rather finely reticulate, with numerous very fine 

 punctures at the intersections of the network, the areolae variable in size and 

 form.. In the male the lustre is moderately shining, in the female quite dull, 

 owing partly to the deeper sculpture, but more especially to a secondary system 

 of minute reticulations. The areolae in the female are distinctly more longi- 

 tudinal in the basal half of the elytra, not appreciably so- in the male. The four 



17 



