[Ap 
This species varies consiaerably in size and colour. It generall 
jands in our collections as Hydrohius hipustulatus of Stephens ; but 
Stephens' description of that species does not accord with the presen 
insect, and as the species has not yet been distinguished (so far as t 
am aware) by foreign entomologists, I have been obliged to give it ; 
new name. 
3. A. BiPUSTTJLATus, Stephens, 111. Brit. Ent., ii, 133 {Hydrohius} 
Late ovalis, sat c'onvexus ; capite nigro utrinque macula magna am 
oculos testacea, antennarum hasi palpisque testaceis, his articul 
ultim,o piceo; prothorace testaceo, disco plus minusve infuscato 
elytris testaceis, nigro-irroratis ; pedibus testaceis. 
Long. 1 — l^lin. 
Common in England, and sometimes taken in numbers with th< 
water-net ; but I have never found it in Scotland. 
The colour differences in this species are of themselves sufficien 
to separate it from the foregoing. I would especially call attention t( 
the large marks on the head as a never failing character. Though, a 
I have stated above, the preceding species is generally called hipustu 
latus, Stephens, and the present one ochraceus, Steph., yet, as Stephens 
description of Hydrohius hipustulatus agrees well with this species, an( 
his description of H. ochraceus cannot possibly be applied to it, I hav( 
felt no hesitation in changing the name, so as to make it accord wit! 
the Stephensian description. 
Eccles, Thornhill, Dumfries, 
February, 1870. 
Note on the occurrence in Britain of Tomicus nigritus, Gyll., and Dryoecetes alni 
Georg. — Some time back Mr, Crotch was kind enough to forward on my behalf ai 
example of a species of Tomicus, distinct from any hitherto recorded as British, t( 
Herr Eichhoff, the great authority for that genus. This has been returnee 
as T. suturalis, now considered the female of nigritus, Gyll., which must therefore 
be added to our list. I captured my specimen in Strath Glass, Inverness-shire 
Mr. Crotch also informs me that he also forwarded to Herr Eichhoff a specimen o; 
the Tomicus described provisionally by Mr. Rye as T. Marshami, and that it is con 
sidered by Herr Eichhoff to be Drycecetes alni, Georg. — D. Shaep, Eccles, Thornhill 
Dumfries, February, 1870. 
Drycecetes alni, Georg. — Without doubting the correctness of Herr Eichhofi 
(who, I presume, possesses or has examined Drycecetes alni) in referring my Tomicui 
(D-) Marshami to that species, I would simply observe that the tree mentioned by 
Georg (Stettin. Ent. Zeit., 1856. p. 59) as that in which his insect lives is the alder, 
whereas Marshami was found in beech : and that his description is so unsatisfactory 
