THE AQUATIC COLEOPTERA OF THE MID-EBUDES 85 



Gyrinus minutus, F. Coll, common on some of the small lochs ; 

 Mull, Tobermory district (Prof. T. H. Beare). 



G. natator, Scop. Coll and Mull, fairly common. 



G. marinus, Gyll. Mull, Tobermory district (Prof. T. H. Beare). 



G. opacus, Sahib. Coll, once or twice only ; Mull, Tobermory 

 district (Prof. T. H. Beare). 



Hydrobius fuscipes, var. picicrus, Thorns. Coll and Mull, I did not 

 find any specimens of the " fuscipes " form. 



Philhydrus melanocephalus, Ol. Coll and Mull, common in the 

 peat pools. 



P. minutus, F. Coll and Mull, in the peat holes, common where it 

 occurred, but extremely local. 



Paracymus nigroaeneus, Sahib. Coll and Mull, sphagnum pools, 

 several specimens on both islands. 



Anacaena globulus, Payk. Coll and Mull, next to H. pubescens, 

 the commonest species. 



Laccobius alutaceus, Thorns. Coll, very few specimens. 

 L. minutus, L. Coll, very few specimens. 

 Limnebius truncatellus, Thorns. Coll and Mull, not common. 

 Helophorus aquaticus, L. Coll, a few. 



H. viridicollis, Stcph. ( = oeneipennis, Thorns']. Coll and Mull, fairly 



common in the peat holes. 

 H. brevipalpis, Bedel. Coll, not common. 



Octhebius lejolisii, Rey and Muls. Coll, apparently very scarce. 

 Hydraena nigrita, Germ. Mull, Salen district (Prof. T. H. Beare). 



The above list of 59 species is certainly incomplete, and, 

 apart from a number of common species which should be 

 found in the district, it is probable that there are other 

 southern species still to be discovered. For instance, the 

 present -known distribution of Helochares punctatus, Sharp, 

 is entirely western in Ireland and south-western in Scotland, 

 except for two records, one for a single specimen taken in 

 Midlothian by Mr. W. Evans, the other for a number of 

 specimens taken on Moncrieff Hill, Perth (Perth Mid) by 

 Dr. Sharp (Coleoptera of Scotland, 1871-8). It should 

 surely occur among the western isles, as it is a peat-moss 

 species, and in Ireland, at least, has much the same 

 distribution as P. nigroceneus. 



In some other groups the range of some of the southern 



