NORTHUMBERLAND AND DURHAM. 67 



6. H. dorsalis, Marsh., Nat. Hist. Trans. I., 321. 

 Rare. Briar Dene, in May. 



OCTHEBIUS, Leach. 



1. 0. exculpatus, Mull., Trans. CI. I., 69. 



2. 0. pygmceus, Fab., 1. c. 



3. 0. bicolon, Steph., 1. c. II., 270. 



4. 0. rufimarginatus, Steph., 1. c. III., 89. 

 Rare. " Wansbeck," Dr. Power. 



HYDRJENA, Kug. 



1. H. palustris, Erich., G. R. Crotch, Proc. Ent. Soc. Lond., 



19th Nov., 1866. 

 Rare. " Wansbeck," Dr. Power. Gosforth. 



2. H. riparia, Kug., Trans. CI. I., 70. 



3. H. nigrita, Mull., 1. c, 



4. H. gracilis, Miill. , 1. c. III., 89. 



5. H. angustata, Sturm, Gr. R. Crotch, 1. c. 

 "In the Wansbeck," Dr. Power. 



6. H. atricapilla, Wat. ; H. flavipes, Steph. 

 "Abundant in the Wansbeck," Dr. Power. 



7. H. pulchella, Gerrn., G. R. Crotch, 1. c. 



8. H. pygmaa, Wat. ; H. minutissima, Trans. CI. I., 70. 

 In the Tyne. " Wansbeck and Hartburn," Dr. Power. 



LIMNEBIUS, Leach, 



1. L. truncatellus, Thunb., 1. c. ; L. ater, 1. c. ; L. papposm, 



1. c. II., 271 (immature). 



2. L. nitidus, Marsh., 1. c. I., 70. 



Whitburn, Long Benton, and Gosforth. " Rothley Lake and 

 Wansbeck," Dr. Power. 



LACCOBIUS, Erich. 

 1. L. minutus, Linn., 1. c. 71 ; L. colon, 1. c. 



