On Aquatic Carnivorous Coleoptera or Dytiscide. 765 
on each side near the fore border, and a middle longitudinal impressed line. ach elytron with four 
lines of impressed points and with a tawny costa. Length of the body, 7} lines.” 
Tt would appear from the above that this is a species near to if not identical with Colymbetes piceus, 
Kl. (No. 957).—D. S. 
1249. Colymbetes sobrinus, Motsch. Bull. Mose. 1859, TIT, p. 170. North America. 
‘‘ Depressiusculus, ovatus, subdilatatus, postice acuminatus ruguloso-reticulatus, nitidus supra niger, 
subtus ater, ore, palpis, antennis, epipleuris pedibusque plus minusve rufescentibus ; capite triangulare 
antice arcuato, quadrifoveolato ; thorace transverso, ad basin utrinque transversim impresso anticeque 
grosso punctato, lateribus marginatus, angulis anticis prominulis, posticis subacutis ; elytris subparallelo 
ovatis, punctis distinctis quadruplici serie ; trochanteribus obtusis. Long. 4 1., lat. 21 1.” 
“Par sa forme applatie et anguleuse il ressemble 4 notre C. neglectus, Er. et au C. chalconatus, Panz., 
mais parait encore plus déprimé et plus paralléle. La téte est triangulaire, arrondie en avant, avec 
quatre fossettes, dont deux sur le front et deux sur la marge interne des yeux et postérieurement. Le 
corselet est transversal, avec des gros points épars le long du bord antérieur et de pareils dans les 
impressions transyersales quise voient de chaque cété de la base et qui s’effacent entiérement au milieu de 
cette derniére. Les élytres sont plus fortement reticulées que le corselet et marquées chacune de quatre 
stries formées par des points aussi gros que ceux du corselet, dont la quatriéme n’est visible que sur la 
partie postérieure du coté latéral, qui fait un peu saillie ; prés de la caréne latérale il y a encore une rangée 
de points imprimés.” Ross Colony. 
This is probably a species of Agabus.—D. 8. 
1250. Colymbetes (Rantus) socialis, Waterh., Ann. Nat. Hist. 4 ser. XVIII, p. 106. Rodriguez 
Island. 
““C. elongato-ovalis, supra obscure flavicans, infra niger; capite postice nigro, vertice transversim 
flavo-notato ; thorace disco guttis parvis duabus approximatis piceis notato ; elytris obscurioribus (flavo- 
limbatis) ; prosterno pallido. long. 44 lin., lat. 23 lin.” 
“‘Hlongate oval, shining. Head yellow with an oblique spot on each side on the forehead, and the 
neck black, the black portions uniting at the eyes. Thorax yellow, with the middle of the anterior 
and posterior margins and two approximate discoidal spots pitchy ; very shining, with a line of punctures 
along the front margin ; there is also a line of obscure punctures along the sides and extending a short 
distance along the posterior margin ; the extreme lateral margins are distinctly incrassate. Scutellum 
pitchy. Hlytra shining, with the sutural line and the sides yellowish, the rest closely spotted with small 
brownish markings as in C. notatus, F.; each elytron with three rows of rather large punctwies, each row 
containing about eight or ten punctures. Underside very shining, black, except the prosternum which is 
yellow, and the margins of the abdominal segments, which are obscurely pitchy. Legs pitchy yellow ; 
intermediate femora and tibie moderately thickly and finely punctured.” 
1251. Colymbetes strigosus, Lec., Proc. Ac. Phil. 1862, p. 522. North America. 
“Hlongate oval; thorax with sinuous rugosities, not connected together; lines of elytra deep and 
distant ; legs very dark. ‘62. Mem. San Diego, California.” 
This is considered by Crotch to be the same as C. strigatus, No. 964 ; it may possibly I think prove to 
be a distinct species, but I have seen only the male in the case of one of the species, and a female in the 
other.—D. 8. 
5 F 2 
