HYDROMETRID/E CORIXTD^E. 283 



(395) 2. Gerris lacustris. Lake Gerris. 



Gerris lacustris. Fab. Ent. Syst. iv, 187, 1. Lat. Hist. Nat. xii, 275, t. xcv,/. 7 ; Gen. iii, 134, 3. Lam. An. sans 



Vertebr. iii, 514, 3. Steph. Cat. ii, 352, 9723, 5. Kirb. and Sp. Introd. to Ent. ii, 360. 

 Cimex lacustris. Linn. Syst. Nat. ii, 732, 117 ; Fn. Suec. 970. Geoffr. Ins. i, 463, 59. Scop. Cam. 394. Vill. Ent. 



i, 537, 203. Schrank. Enum. 557. 

 Hydrometra lacustris. Fab. Syst. Bhyng. 256, 1 . Walck. Fn. Paris, ii, 350, 1 . 

 Cimex Naias. De Geer Ins. iii, 311, 39, t. xvi, /. 7. 

 La punaise Nayade. Geoffr. 7ns. i, 463, 59. Stoll. Pun. 42, t. ix, f. 63. 



Rai. Hist. Ins. 57, No. 6. Bauh. Boll. 213, /. 1. List. Mut. t. v, /. 4, 5. Bradl. Nat. t. xxvi,/. 2, d. Sulz. 7ns. 

 t xi, /. 78. 



There were three pupae of this species taken, which do not appear to differ from 

 the European specimens. 



II. HYDROCORISA. Lat. 



Family CORIXIDiE. Corixidans. 



CLXXIII. Genus CORIXA. Geoff. 



(396) 1. Corixa striata. Streaked Corixa. 



Corixa striata. Lat. Hist. Nat xii, 289; Gen. iii, 151, 1. Lam. An. sans Vertebr. iii, 521, 1. Leach Linn. Trans, xii, 



16, 2. Sam. Compend. 228, 2. Steph. Cat. ii, 354, 9739, 5. 

 Sigara striata. Fab. Ent. Syst. iv, 60, 2 ; Syst. Rhyng. 104,2. Schellenb. Cimic. t. xi. Ced. Fn. Ingr. 840. 

 Notonecta striata. Linn. Syst. Nat. ii, 712, 2; Fn. Suec. 904. Vill. Ent. i, 475, 2. Scop. Cam. 349. 

 Nepa striata. De Geer Ins. iii, 389. 



Pet. Gazoph. t. lxxii, / 7. Ros. 7«s. App. i, 177, t. xxix. Joblot. Micr. i, 1, t. vii, /. 2, 3. Schseff. Elem. t. 1. Stoll. 

 Cimic. 65, £. xiii, b. 



Length of the body 3 — 3| lines. 



Many specimens taken with the preceding. 



DESCRIPTION. 



Body yellowish, depressed, naked, smooth. Head inflexed, obtuse ; eyes brownish, triangular ; 

 antennae inserted before the eyes under the lateral margin ; scape incrassated ; remaining joints to- 

 gether are setiform : prothorax subtriangular, with the hemelytra, brown, streaked transversely, with 

 irregular yellow streaks ; epipleura not streaked, pale-yellow ; breast black, spotted with yellow on 

 the sides : legs yellow ; anterior and posterior tarsi natatory ; the latter longer than the tibia? : ab- 

 domen with the first ventral segment, and an abbreviated basilar band of the second, black. 



Variety B. With the first joint of the posterior tarsi black at the tip. This may be a distinct 

 species, there were seven specimens distinguished by a black annulet surrounding 

 the terminal half of the first dilated joint of the tarsus in question. 



2 02 



