erate sized palettes ; protarsal claws mutually similar, a little straighter and feebly 

 sinuate beneath. Length 7.5 to 7.8 mm. 



Specimens before me bear labels, Vernon, British Columbia (Wick- 

 ham collection) ; Edmonton, Alberta (Carr) ; Piquitenay River and 

 Mile 214 Hudson Bay R. R., Manitoba (Wallis). 



LeConte's type was from the "Loup Fork of the Platte River," 

 Nebraska. 



Carrhydrus 



New Genus (tribe Agabini) 



Of the general aspect of our large species of Ilybius ; broadly evenly 

 oval, the outline continuous. Antennae attaining the hind angles of 

 the thorax, the intermediate joints broader and somewhat compressed 

 in the male. Maxillary palpi normal ; penultimate joint of labial palpi 

 strongly dilated apically, the distal half having somewhat the form 

 of a triangular prism with concave faces. Prothorax narrowly mar- 

 gined at sides, base broadly feebly lobed at middle; upper surface 

 minutely reticulate. Prosternum strongly carinate throughout, the 

 intercoxal process narrow, gradually finely acuminate at tip; mesos- 

 ternum deeply abruptly channeled at summit; metasternum deeply 

 grooved between the coxae. Coxal plates strongly sinuate on their 

 inner margin and distant by less than one third of their own length 

 from the middle coxae ; metasternal wings narrowly triangular. Hind 

 coxal processes thickened, rather strongly produced and deflexed away 

 from the abdominal surface, their tips narrowly separated. Legs 

 short and stout, all strongly sexually modified, the basal joint of 

 middle tarsi of male suborbicular and extremely large ; hind thighs 

 with row of bristles along the posterior margin at apical angle ; joints 

 of posterior tarsi not lobed at tip, the terminal joint but little shorter 

 than the two preceding united, its claws very unequal. 



C. crassipes new species. 



Male. Broadly elliptic oval, rather strongly convex, black, feebly shining, the 

 side margins obscurely rufescent. Head with labrum and two vertex spots dull 

 rufous. Antennae, palpi, legs and prosternum dark rufous to rufopiceous, 

 trunk beneath nearly black. Antennae rather stout, gradually incrassate medially, 

 joints 6-8 widest. Prothorax two-thirds wider than long, sides broadly evenly 

 arcuate, surface very minutely irregularly reticulate; elytra equally minutely but 

 very regularly reticulate, much as in certain species of Agabus (subfuscatus, 

 phaeopterus, etc.) and with an extremely fine punctulation in addition to the 

 somewhat coarser but still very fine irregular dorsal series of punctures. Body 

 beneath finely strigose as in Ilybius. Front thighs stout, the middle ones still 

 more strongly incrassate ; front and middle tibiae stout, subtriangular, the former 

 sinuately expanded apically, the latter with the external margin straight and 

 much longer than the inner. Front tarsi with the basal three joints broadly 



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