446 Rev. A. Matthews on Dr. C. Flach’s 
decline to be considered responsible for mistakes made by 
other people. But the expression “ex typ.” may account 
for many of the errors of nomenclature contained in this list. 
I have myself suffered from the careless manner in which 
specimens are often named and then distributed as types of 
certain species; and the same misfortune may have, and 
probably has, happened to Dr. Flach. P. Bruckit is con- 
spicuously distinct from all its congeners. P. turgidum I 
described from a type I received from M. Thomson; it is 
allied to P. formicetorum alone. In his next subgenus 
Dr. Flach has placed P. éntermedium, Wank. ; but this is so 
closely allied to P. evanescens, Marsh., that it seems strange 
to have placed them so widely apart. 
Of the ten species contained in his subgenus Ptenidiwm 
four are introduced by Dr. Flach himself, and are all unknown 
to me; but throughout the Pienidia it would be difficult to 
find among the older species five more totally dissimilar 
than those which he has grouped together in this division, 
namely, P. fuscicorne, formicetorum, evanescens, Brisouti, and 
punctatum. In his last subgenus, G'¢/lmezsterium, Dr. Flach 
has placed but two species, P. ndttdum and P. Reitéer’; the 
synonymy assigned to the former of these is, as far as I can 
judge, correct, with the exception of P. levigatum, Gillm. 
I need not repeat again what I have said only a few lines 
above respecting this species, but, should any doubt exist, 
must refer its solution to the description and figure given by 
Gillmeister himself or to those in the ‘ Trichopterygia Illus- 
trata.” 
The genus Luryptilium is placed next in succession, and in 
this genus Dr. Flach has included Ptelium marginatum, Aubé. 
It seems to me that Dr. Flach is right in adding this species 
to Euryptilium, for the apex of the elytra is entire and its 
whole form and sculpture very similar. 
Among the Pétlia the subdivisions and the combination of 
species become more numerous and still more perplexing. In 
his first subgenus Dr. Flach places P. Kunze? alone, but 
amalgamates under that name P. brevicolle, whose thorax is 
one half shorter, and P. rugulosum, which has long and 
slender antenne and exhibits striking differences in outline 
and sculpture. The next subgenus, Yrichoptilium, contains 
but one species, 7. Sahlbergt. ‘The figure of this insect 
(pl. xi. fig. 3) clearly proves that it cannot possibly be 
included in any part of the genus Ptilium, since its thorax 
overlaps the shoulders of the elytra, a formation hitherto only 
found in Actid‘um and Microptilium. Then follows the 
subgenus Zyphloptilium, containing 7. wdipus and two others 
