On Aquatic Carnivorous Coleoptera or Dytiscida. 761 
1228. Colymbetes (Ilybius) fraterculus, Lec., Proc. Ac. Phil. 1862, p. 521. North America. 
“Base of thorax broadly rounded ; brownish-black, slightly bronzed, oval, slightly dilated at the 
middle, not less obtuse behind; thorax with the sides nearly straight ; elytra with the anterior pale spot 
very small, the hind one wanting ; lines of punctures visible only behind the middle. 42. North Red 
River.” 
1229. Colymbetes geedeli, Villa, Col. Eur. dupl. 1833, p. 33. Italy. 
“‘Ovatus, niger, subdepressus ; pedibus elytrisque piceis ; thoracis elytrorumque margine exteriore 
flavo.” 
This may I think be allowed to be forgotten in future.—D. 8. 
1230. Colymbetes gutticollis, Say, Tr. Am. Phil. Soc. IV, p. 442. Mexico. 
“ Thorax yellowish with four black spots; head black, anteriorly and band of vertex yellow. Head 
black ; a transverse yellowish band between the nearest points of the eyes; a dilated yellowish triangle 
occupying all the anterior part of the head, the apex being at the middle of the face; antenne and 
palpi honey-yellow, dusky at their tips; thorax honey-yellow, anterior margin blackish ; posterior 
margin dusky ; four large black spots in a transverse series, the two intermediate ones nearer together ; 
elytra honey-yellow with minute black points more or less crowded so as to give a dusky, sometimes 
almost blackish appearance ; lateral margin destitute of black punctures, but with a black line on the 
posterior curvature ; at base, particularly the humeral base, destitute of the black punctures; three 
regular series of small black dots ; beneath black ; pectus, feet and epipleure yellowish. Length, over 
two-fifths of an inch.” 
“Taken in the river beyond Vera Cruz.” 
“Tt is about the size of the C. adspersus, Fab., which it considerably resembles if we except the thoracic 
black dots.” 
This is probably near if not actually identical with C. binotatus (No. 935); the description in 
several points does not apply to that species very well.—D. S. 
1231. Colymbetes impressus, Zubk., Bull. Mose., VI, 1833, p. 317. Turcomania. 
“Tong. 3 lig., larg. 1} lig. Tl est brun avec les bords de la téte, du corselet et des élytres un peu ferru- 
gineux. Le corselet 4 une impression bien marquee au milieu, prés du bord postérieur. Les élytres 
paraissent lisses, mais avec une forte loupe on voit quwils sont couverts de petits points trés rapprochés. 
Chaque elytre a le long de la suture une serie de points enfoncés, rapprochés, inegaux. Le dessous du 
corps est noir ; les pieds sont ferrugineux. 
“'Turcomania.” 
1232. Colymbetes ineequalis, Horn, Tr. Am. Ent. Soc., 1871, p. 330. North America. 
““Blongate oval, broader behind the middle. Head black with vertical rufous spot, and anterior 
margin pale yellow, very finely and densely punctured. Thorax yellowish or brownish with median 
transverse band and narrow margin at middle of base black, surface intricately and confluently lined and 
in the intervals punctured, lines obsolete at margin which is densely and finely punctured with a few 
coarser punctures intermixed. Elytra brownish, sometimes paler, margin paler than disc; surface 
sculptured with transverse lines more deeply graven at the basal two thirds, in which region the surface 
is subopaque from the intervals between the lines being scabrous ; apical third more shining. Body 
beneath black shining, surface finely transversely strigose, strigee becoming longitudinal at the first two 
abdominal segments and at the sides of the others, and at the middle of the segments the lines are nearly 
