762 On Aquatic Carnivorous Coleoptera or Dytiscide. 
transverse, but very distantly placed. Legs pale, femora piceous; legs sometimes entirely black. 
Length, -66—-70 inch ; 16°5-17°5 m.m.” 
This species is closely allied to C. seminiger, Lec., (No. 963), but according to a female recently 
communicated to me, is narrower, has the legs and epipleure paler, and the sculpture of the thorax and 
elytra much coarser than in the male of C. seminiger.—D. 8S. 
1233. Colymbetes includens, Walk., List. Col. Lord, p. 14. Arabia. 
“Black, elliptical, smooth, shining. Head with an interrupted transverse tawny streak in the disc; 
forepart tawny, including a black spot on each side. Paipi, antenne and legs tawny. Prothorax 
testaceous, with two abbreviated black bands, one in the disc, the other on the hind border. Elytra 
with a testaceous ground hue, which is very closely covered with minute black speckles. Length of the 
body 6 lines.” 
1234. Colymbetes interclusus, Walk., Ann. Nat. Hist. 3rd Ser. II, 1858, p. 204. Ceylon. 
“ Ater, capite antice, thoracis lateribus latis, elytrorum fascia lata basali et vitta marginali postice 
attenuata luteo-ferrugineis. Long. 5} lin.” 
This is I believe a species of Rhantus unknown to me.—D. 8. 
1235. Colymbetes lateralis, Gebl., Nouv. Mem. Mose. I, p. 40. Siberia. 
“‘ Oblongo-ovalis, luteus, supra subtilissime alutaceus, thorace macula apicali elytrisque nigro-eneis, his. 
margine late luteo. Long. 4 lin., lat. 2 lin. Eneo-nitidus.” 
Motschulsky in Schrenck’s Amur Reise, p. 102, assigns this species to the genus Ilybius.—D. S. 
1236. Colymbetes latus, Gebl. Bull. Ac. Pet. VIII, 1841, p. 371. Siberia. 
“‘Dilatatus, niger, subtilissime coriaceus, ore, antennis, thoracis extremo margine pedibusque anticis 
ferrugineis, thoracis lateribus longitudinaliter impressis, ruguloso-punctatis, elytris postice depressis, late 
rotundatis, lineis tribus subelevatis et pone illas striis tribus e punctis majoribus. Long. 4% lin., 
lat. 23 lin.” 
‘“‘ Valde aftinis C. bipustulato; sed statura latiore et forma elytrorum differre videtur.” 
The genus appears to me doubtful, although the comparison made is, I suppose, with a species of 
Agabus.—D. S. 
1237. Colymbetes lineatus, Redt., Hugel. Casch. IV, p. 503, pl. 23, f, 5. India. 
“< Ovalis, niger, clypeo, vertice, angulis anterioribus thoracis, antennis, palpis pedibusque anterioribus 
rufo-ferrugineis ; elytris striis macularibus basique pallide-testaceis. Long Ya 
“Durch seinen flachen Kéorper und vollkommene ovale Form desselben auffallend von der 
gewohnlichen Form der Colymbeten verschieden.” 
I know nothing like this, and am doubtful what it should go near; perhaps the Japanese Agabus 
dissimilis, No. 766.—D. 8. 
1238. Colymbetes magellanicus, Bab., Tr. Ent. Soc. IIT, p. 10. Patagonia. 
“Ovatus, niger, subdepressus, elytris subcostatis macula parva laterali oblonga fenestrata, subtus 
niger, antennis pedibusque fuscis. Long. 3, lat. 13 lin.” 
‘‘Ovate, black, very minutely reticulate strigose. Head immaculate. Antenne fuscous. Thorax 
