158 Mr. R. M‘Lachlan’s Monograph of the 
golden-grey, thickly reticulated with dark grey ; dark greyish- 
fuscous spots round the apical margin, one at the termination of 
each apical sector; the pale dorsal blotch is ill defined, and is 
indicated by an irregular pale space, scarcely reticulated ; a simi- 
lar but still more indistinct paler space occupies the whole of the 
lower two-thirds of the apical portion of the wing; neuration 
fuscous. Posterior wings pale greyish, subhyaline ; apical veins 
darker grey, sometimes margined with grey at their points of in- 
sertion in the apical margin. Legs testaceous; the tips of the 
anterior and intermediate tibize externally fuscous; tibial spurs 
dark brown. Abdomen fuscous, ochreous beneath, testaceous 
at the apex above, and with testaceous appendices. In the male 
the superior lobe is short, rather attenuated at the base, but soon 
greatly dilated, the apical portion being nearly orbicular ; app. sup. 
nearly concealed under the lobe, the external edge rounded, slightly 
excised in front; app. inf. rather short, the basal joint broad, with 
the sides parallel, the apical joint scarcely shorter than the basal, 
and of equal breadth, the apex very obliquely truncated; penis 
furnished above with a short broad dark chestnut-brown superior 
cover; lower sheaths bent slightly downwards (their direction 
varies in dead specimens), dark shining chestnut-brown, clear 
testaceous at the extreme base. 
Expanse of fore-wings 123 lines. 
I took five examples (all males) in the middle of June, 1865, 
at a little stream running into the sea on the coast of the Firth of 
Forth, near Longniddry. The discovery was made too late for 
me to give figures of the appendices. 
I have some doubt in announcing this as a new species, since the 
form of the appendices agrees very well with the figure of those of 
R. ferruginea, sent to me by Dr. Hagen. I submitted an example 
to that gentleman, and he says that it is larger and darker than 
his continental types of that species, and may be distinct. &. fer- 
rugined is described as “die kleinste Art” of the group (the true 
genus Rhyacophila) to which it belongs. 
B. Terminal joint of the inferior appendices in the male cleft. 
4. Rhyacophila munda, M‘Lachlan. (Pl. XIV. fig. 10, app.) 
Rhyacophila munda, M‘Lach. Trans. Ent. Soc. ser. 3, vol. i. 
p. 309 (1862); Ent. Ann. 1863, p. 135, fig. 6. 
Antenne brown, annulated with yellow. Palpi pale brown. 
Head and thorax fuscous, with a few golden-yellow hairs. An- 
