C02 On Aquatic Carnivorous Coleoptera or Dytiscidce. 



portion of the elytra is less shining than in the male, and the sculpture consists of 

 short, dense, indistinct striae. 



This species seems quite intermediate between Coptotomus obscurus, and C. 

 longulus. 



North America, (Massachusetts). 862. 



912. Coptotonms longulus, Lee, M.C. — Fern., Ovalis, convexus, elongatus, supra 

 minus nitidus, testaceus, vertice, thorace anterius et posterius in medio, elj^trisque 

 vittis irregularibus plus minusve coalescentibus nigris ; corpore supra densius sub- 

 tiliter strigosulo, elytris versus apicem subtiliter punctatis ibidemque nitidis ; 

 prosterno in medio crasso, anterius perpendiculari ; coxis posterioribus magnis, 

 conspicue rugoso-punctatis. Long Si, lat. i m.m. 



I have seen only a single female of this species ; it is more elongate and nar- 

 rower than that preceding, has the sculpture of the elytra denser, and that of the 

 hind coxas coarser ; the interval between the middle coxal cavities and the front 

 border of the hind coxse is rather larorer. 



o'- 



North America, (Laramie, Nebraska, Colorado ; sec. Crotch). 863. 



L 60.— Genus LANCETES. 



Extremity of elytra sinuate-truncate. Palpi scarcely or not at all emarginate 

 at the apex of the last joint : coxal processes elongate, deeply divided and much 

 divergent. 



Five species* are known, three from Chili, one from southern South America, 

 the other from Auscralia and New Zealand : although resembling in colour and 

 appearance the species of Rhantus, these insects may readily be distinguished 

 therefrom by the truncate elytra. 



913. Colymbetes lanceolatus, Clk., M.C. — Ovalis elongatus, uurantiaco-testaceus, 

 vertice late, prothorace anterius et posterius in medio, elytris vittis elongatis nigris ; 

 elytris subtiliter undulatum strigosulis, punctis seriatis couspicuis, apice subtruncatis; 

 prosterno in medio anterius sub-prominulo, vix rotundato. Long. lOl, lat. 5 m.m. 



The male has the basal joints of the front tarsi a good deal dilated and moderately 



* In udditiou to these the following probably belong to the genus. Agabus truncatij)ennis, Sol. (No. 

 1205, huj. op.)?=No. 915; Chili. —Colymbetes angiisticollis, Curt. (No. 1211) ; Chili.— Colymbetes 

 rotundicollis, Bab. (No. 1245) near No. 916 ; Patagonia. 



