NORTHUMBERLAND AND DURHAM. 19 



DYTISCIDES. 

 ACILIUS, Leach. 

 1. A, sulcatus, Linn., 1. c. 66. 



DYTISCUS, Linn. 



1. D. marginalis, Linn., 1. c. 



2. D. punctulatus, Fab., 1. c. 



COLYMBETES, Clairv. 



1. C.fuscus, Linn., 1. c. 64. 



2. C. pulverosus, Sturm., 1. c^ 

 Rare with us. 



3. G. exoletus, Forst., 1. c. 



4. G. bistriatus, Bergst., 1. c. II., 268. 



"Ina moss on Whitsunbank Hill," Mr. J. Hardy. 



ILYBCS, Br. (COLYMBETES, Cat.) 



1. I. ater, Deg., 1. c. I., 66. 



2. I. obscurus, Marsh., 1. c. ; C. sex-dentatus, Nat. Hist. Trans. 



I., 318. 



3. I.fenestratus, Fab., Trans. CI. 1. c. 

 "Twizell," P. J. Selby, Esq. 



4. I. guttiger, Gyll., 1. c. II., 269. 



5. I. angustior, Gyll., 1. c. 



"In a moss, Whitsunbank Hill," Mr. J. Hardy. 



6. I. uliginosus, Linn., 1. c. I., 66 (fuliginosus). 



AGABUS, Leach. (COLYMBETES, Cat.) 



1. A. arcticus, Payk., 1. c. IV., 54. 



In some plenty near Whittingham, by G. Wailes, Esq., and 

 on Cheviot, by Mr. J. Hardy. 



2. A. dispar, Bold, 1. c. I., 277; A. uliginosus, Payk. 

 Boldon Flats and elsewhere. Not uncommon. 



3. A.femoralis, Payk., Trans. CI. I., 65. 



