66 Mr. R. M‘Lachlan’s Monograph of the 
Case very firm; composed of little twigs and other vegetable 
débris, placed longitudinally. At the posterior part of the case 
there are often placed longer and stronger twigs, which extend 
considerably beyond the tube, and form a sort of tail; these are 
cut off when the larva is about to change. (Pictet.) 
A common species in many places in September and October. 
It varies considerably in the extent to which the wings are 
marked with grey ; some examples are also much yellower than 
others. 
2. Halesus guttatipennis, n. sp. 
(Pl. Lig. 25) Plex ig 0 app.) 
Antennz and palpi blackish, Head and mesothorax dull 
blackish. Prothorax with a few yellowish hairs. Anterior wings 
pale greyish-fuscous, with numerous rather indistinct pale irrora- 
tions, most plentiful towards the apex; pterostigma slightly 
brownish; neuration fuscous ; a small whitish hyaline mark at the 
thyridium ; all the apical cells nearly equal in width, none of them 
acute at the base. Posterior wings whitish-subhyaline, slightly- 
brownish-grey at the apex. Legs testaceous, with black spines ; 
thighs greyish-black, testaceous at the knees; tarsi fuscescent. 
Abdomen dull-blackish, with reddish-ochreous lateral lines. In 
the male the upper margin of the Jast abdominal segment is pro- 
duced in the middle and bent under like a lip; app. sup. testa- 
ceous, obtusely spoon-shaped, scarcely projecting beyond the 
segmental margin; app. intermed. testaceous, directed upwards, 
the tips approximating; at the base of the app. intermed. is a 
horizontal, nearly quadrangular plate, the outer margin of which 
is excised ; app. inf. fuscous, somewhat testaceous, the tips trun- 
cated and rather thickened, provided with long hairs ; penis appa- 
rently unfurnished with sheaths, much exserted, whitish-yellow, 
the apex slightly notched. 
Expanse of fore-wings 12 lines. 
Of this I have seen but one specimen (a male) taken by Mr. 
Edwin Brown, probably near Burton-on-Trent. Several closely- 
allied species are found on the Continent (some of them yet 
undescribed), but I cannot find that this has hitherto been 
noticed. 
b. Posterior nings of the male furnished nith a pouch in which is 
placed a pencil of long hairs. (This pouch is usually closed 
and nearly invisible in dead specimens.) 
