vex not depressed elytra, will readily distinguish these insects 
from Ochthebius, to which they are very closely allied, and 
may be easily confounded with them. 
The following species were taken by Mr. Gibson of Hebden 
Bridge, near Halifax, Yorkshire, and transmitted to me by 
Mr. John Smith of Bury, Lancashire, who informs me that 
they were found on stones in the bed of the river Hebden ; 
and as only one of them has hitherto been described, I shall 
subjoin their specific distinctions. 
1. E. viridiaeneus Steph.pl . 15. f. 6. 
Cupreous, sometimes greenish. Head and thorax 
slightly punctured, the latter very convex, with only 
2 foveolets, and the basal oblique foveae are long 
and narrow, not oval ; in other respects like No. 3. 
Taken in October. 
2. E. tristis Gibson MSS. 
Very like No. 1. Black, the thorax less punctured, 
and the anterior foveolet scarcely visible. 
This probably is only a smooth variety of E. viridi- 
ceneus. 
3. E. Gibsoni Curtis Brit. Ent.pl. 291. 
Thorax more depressed and much more strongly punc- 
tured, with 6 anterior foveolets, and the basal foveae 
broad and oval. 
Ahrens’s fig. 7, fascicle 8, is intended probably for 
one of these insects, although it is named by him 
Ochthebius pygmams. 
With these curious insects Mr. Smith obligingly transmitted 
specimens of Conferva Jluviatilis , from the same locality. 
