110 Mr. R. M‘Lachlan’s Monograph of the 
of antennze clothed with snow-white hairs. Palpi fuscous. Meso- 
thorax shining black. Anterior wings dark brown ; a snow-white 
line near the base reaching half across the wing; a spot on the 
costa at the pterostigma, another opposite to it on the dorsal 
margin, and frequently a third between, smaller, all forming an 
interrupted snow-white fascia; an oblique white spot on the costal 
margin near the apex. Posterior wings smoky-greyish, subhyaline 
and iridescent. Legs greyish, the intermediate legs paler; tarsi 
annulated with white. Abdomen blackish, with grey lateral 
lines. 
In the male the app. sup. are short, broad and obtuse, hairy ; 
beneath the bifid lobe of the last segment proceeds a straight 
acute upper penis-cover ; below this is the short testaceous 
penis; app. inf. curved upwards and inwards, furnished with a 
small second joint at the tips. In the female there are two short 
and obtuse lateral valves. 
Expanse of fore-wings 8—9 lines. 
A common insect about streams, appearing in summer and 
autumn. Easily recognized by the white vertex and spotted wings. 
I have received from Mr. Parfitt specimens of a Leptocerus 
taken near Exeter, which he considers distinct from ZL. albifrons. 
They are larger and darker than the ordinary form, with the 
white markings very indistinct, and show scarcely a trace of the 
white hairs on the vertex. The legs and antenne are also 
darker. The appendices are very similar, but [ am not sure that 
the males possess the long upper penis-cover found in albifrons. 
I hope, by a sight of fresh specimens, to be able to decide if it 
really be distinct. 
Genus Trr@noprs* (new genus). 
Antenne thin, more than twice the length of the wings, basal 
Joint stout and as long as the head. Maxillary palpi very long 
and hairy; the first two joints broad, of nearly equal length; 
third joint very long; fourth and terminal joints shorter, nearly 
equal. Labial palpi small. Mesothorax convex, ovate. Ante- 
rior wings narrow, somewhat dilated towards the apex ; costal 
margin straight; hairy clothing very dense; neuration very in- 
distinct, unless the hairs be removed ; discoidal cell long and 
* Jn a “Synonymic List of the British Trichoptera,’’ published in the 
Entomologist’s Annual for 1865, I used the term Triena; this having heen 
previously employed, I have changed it to Trienodes. 
