LXXV 
in the Gen. des Coléoptères, IX, pp. 82 and 83 was unable to add 
any contribution to a knowledge of it. 
Horn in Trans. Am. Ent. Soc., V, p. 150, says (speaking I believe 
as the result of an inspection of a typical example in Sallé’s collec- 
tion) « Plagitlimysus pulverulentus Motsch. is distinct from any 
species ['have seen and appears to be a Veoclytus, and if so the 
generic name of Motschoulsky has priority. » 
Some months ago my attention was attracted by the figures of 
Motschoulsky, mentioned above, in the Bull. Mosc., 1845; I reco- 
gnised these as very similar to some Hawaïian insects for which 
I established the genus Clytarlus, Trans. Ent. Soc. Lond., 1878, 
p. 208; and I consequently entered on an investigation to find out 
all possible about this genus P/agithmysus of Motschoulsky with the 
result of discovering so much confusion that I have thought it useful 
to publish the results of my observations and correspondence. 
The generic name (CZylarlus Sharp is clearly a synonyme of 
Plagithmysus Motsch. and this latter should be adopted. 
The only example of P. pulverulentus Motsch. I can hear of as 
extant and accessible is one in Sallé’s collection, obtained from 
Sturm’s collection, this latter entomologist having received it from 
Eschscholtz; although I have not been able to compare this insect 
with my Clytarlus robustus it is 1 believe a species very closely 
allied thereto but possibly different. It certainly is not any other 
species of Clytarlus known to me. As regards the locality « Cali- 
fornia » given for P. pulverulentus, 1 feel sure it is erroneous for 
the following reasons : 1. All that is authentically known of the 
species of CZytarlus leads to the conclusion that they are peculiar to 
the Sandwich islands; 2. Eschscholtz collected in the Sandwich 
islands as well as in California ; 3. Neïther this insect nor anything 
at all similar to it has since been found in California or anywhere 
else except in the Polynesian islands. 
Passing to the second species included in the genus Plagithmy- 
sus viz. Clytus attenuatus Boisd. of this I believe there exists only 
a single example, at present in our National collection at Kensing- 
ton. Boisduval, oc. sup. cit., in describing the species calls it 
« Clytus attenuatus Dejean » and says « collection de M. Dejean » : 
he gives however as its habitat « Nouvelle Hollande ». Chevrolat 
purchased Dejean’s collection of Longicorns, and thus he says in 
describing the insect « Collection de l’auteur » (i. e. Chevrolat). 
The Chevrolatian collection of Longicorns was purchased for our 
national use, and I have consequently been able with the assistance 
of Mr. C. O. Waterhouse to examine this Dejeanian-Chevrolatian 
example. The Dejeanian label has the writing now nearly illegible, 
obliterated by the lapse of time, but Mr. Waterhouse was so kind 
