THE ENTOMOLOGIST. HI 



laciniae are angulate, the elytra acuminate ; in Platambus 

 (maculatus) the thorax has the posterior angles produced ; 

 and in Eriglenus (abbreviatus) these angles are rectangular. 



Agabus dispar. — If Linnicus's name of uliginosus be used 

 for the llybius, it is impossible to retain it for this also, both 

 because they would be much too near in position, and be- 

 cause Paykull quotes Linnceus ; hence Mr. Bold's name will 

 have to be retained. 



Heterocerus arenarius, /v.s•^<:?. — This species was long ago 

 introduced as British by Mr. Haliday, in the ' Natural His- 

 tory Review,' but had apparently escaped notice. 



Elmis troglodytes, GyU — This species is very closely allied 

 to E. tuberculatus, but is markedly smaller, and has the thorax 

 longer and the elytra more visibly punctate-striate. I have 

 seen it hitherto only from the North. 



Helophorus granularis. — This is one of those species of 

 Philhydrida which seem to vary in almost every locality. I 

 certainly am unable to make them into defined species, 

 unless three or four more be added, and this may ultimately 

 prove to be the correct view : at present I feel much in want 

 of further material, and have what appear to be three good 

 and undescribed species, which are, however, represented by 

 single specimens only. 



H. Mulsanti. — This name has been given by Mr. Rye, in 

 his ' British Beetles,' p. 255, to the dorsalis of Mulsant ijiec 

 Marsh). The only specimens I have seen are my own, found 

 at Liverpool. The true dorsalis, Marsh., is the 4-signatus of 

 continental collections, an insect found in various parts of 

 the country, especially the woods of Leicestershire, &c. 



Hydrffina Sieboldi. — This name has been retained, rather 

 than that of Mr. Waterhouse's (which has priority), because 

 pygmaeus is already in use in the closely-allied genus Ochthe- 

 bius. Much trouble would be saved if authors would avoid 

 the repetition of the specific names, not only in the same 

 genus, but in the same family. The limits of genera are often 

 uncertain, and hence alterations may continually be neces- 

 sary. 



H. flavipes. — This species was described by Mr. Water- 

 house as atricapilliis, but was referred to a new genus, of 

 which the characters were incorrectly exposed ; hence the 

 name cannot be retained. 



