NEW BRITISH SPECIES, ETC., IN 1869. 49 



10. Hydroporus parallelus, Sharp, 1. c. (described); 



T. J. Bold, 1. G. 



Described from a single specimen, found by Dr. Sharp, at 

 Rannoch, Perthshire. There is another in Mr. Bold's col- 

 lection, taken in the north of Northumberland. 



Dr. Sharp states that this insect may be known from his 

 H. monticola by its narrower and more elongate form (he 

 has examined my elongate var. of monticola above alluded 

 to), longer and darker antennas, and the two longitudinal rows 

 of large punctures on each elytron ; and fi'om H. melano- 

 cephalus, $ , which it somewhat resembles in form and co- 

 lour, by being more parallel, less distinctly punctured, and 

 with a strongly margined thorax. 



11. Hydroporus incognitus, Sharp, 1. c. (described); 



T. J. Bold, 1. c. 

 ? vagepictus, Fairm. 



According to Dr. Sharp, this species is allied to H. pa- 

 lustris, but is larger, especially broader (approaching^. ery~ 

 throcephalus in form), with the pale maikings less developed 

 and not so distinct from the ground colour, the punctuation 

 of the elytra rather more distinct, and the pubescence rather 

 finer and more sparing. 



Found in several parts of Scotland, and also near Cam- 

 bridge, and appears to have been recognized as distinct by 

 Mr. Bold, who meets with it near Newcastle. As Dr. Sharp 

 observes, I have long had an insect closely allied to palustris 

 separated from that common species as possibly distinct; but 

 it does not exhibit all the characters given for H. incogiiitus. 



12. Hydroporus obsoletus, Aube, Icon.; id., 1. c, 597 ; 



D. Sharp, 1. c, 81 ; T. J. Bold, 1. c. 

 Allied to H. ferrvgineusj Steph., {victor^ Aube), but of 

 1870. E 



