84 Mr. R. M‘Lachlan’s Monograph of the 
Expanse of fore-wings 83 —10 lines, the females the largest. 
I found this species on the 10th June, 1864, at Sutton-at-Hone 
by the river Darenth, but not commonly. I have since seen a 
female taken near Blandford by Mr. Eaton, which may belong 
here. 
This belongs to a section of the genus of which there appear 
to be several very closely-allied species found in Europe. 
According to information with which I have been favoured by 
Dr. Hagen, 7. picicorne, Rambur, and species Nos. 8,9, 10 and 11 
(the last, S. obtusus, Hagen, and probably identical with pici- 
corne), noticed in the Stettin Zeitung for 1859, p. 146, have all 
similarly formed appendices to fumipennis, but all differ in being 
brownish in colour instead of black. 4S. niger, Hagen, differs in 
the form of the superior appendices, which are long. SS. auratus, 
Hagen, from Corsica, should be sufficiently distinguishable by its 
paler colour.* JI am of opinion that the number of spines on the 
ventral surface of the antepenultimate abdominal segment does 
not furnish a character of any specific value, as I find in English 
specimens of fumipennis that they vary from 3 to 4 on each side 
of the long central one, and in two specimens in my collection 
from Prussia, which otherwise are precisely similar, there are only 
two small spines on each side. 
The figure of the lateral view of the appendices of the male is 
copied from Dr. Hagen’s drawing, and is, I think, correct, only 
that the app. inf. do not appear to me to be so deeply bifid as is 
there represented. Unfortunately at the time I captured my 
specimens I did not recognize them as being new, and neglected 
to make an examination while they were yet fresh. 
Genus Mormonia, Curtis. 
Antenne thin, slightly longer than the wings, the basal portion 
sometimes fringed in the male (Helictomerus) ; basal joint very 
long and hairy, somewhat curved, longer and thinner in the fe- 
males than in the males. Head small, hairy. Maxillary palpi in 
the males two-jointed (?), very hairy, club-shaped (Mormonia) ; 
or long and band-like, coiled round somewhat like a watch-spring 
(Helictomerus). In the females these palpi are very long, the two 
basal joints short, the first stouter; third joint nearly as long as 
* Two species of Silo described by Meyer-Dur in the “ Mittheilungen der 
Schweizerische Entomologische Gesellschaft,” 1864, p. 223, under the names 
Aspatherium frigidum and A. medium, are quite unknown to Dr. Hagen and 
myself, 
a 
