1890.] (53 



Leptoceetjs ateerimtis, Steph.- — Lac de Joux at Le Pont, common. Apparently 

 exclusively of the form or race in which the anterior wings are wholly reddish- 

 brown {perfusus, Steph., tineoides, Brauer), and of somewhat large size. This 

 was the first occasion on which I had seen this common species unrepresented 

 by the type-form. 



Mtstacides azueea, L. — Lac de Joux, not common. 



Mystacides longicoenis, L. — Lac de Joux at Le Pont, and Lac Brenet, abundant. 

 Not more than one in twenty of the individuals have any trace of the dark 

 fasciae on the anterior wings. The majority have these wings wholly lightly 

 clothed with yellowish pubescence, and with a darker pterostigmatic clouding ; 

 the hind-wings paler; the antennae with a dark mark only at the sutures (some- 

 times absent). This form (which shows an approach towards M. monochroa, 

 McLach.) occurs elsewhere, and is almost worthy of a varietal name, but it 

 seems to be linked to the banded form {quadrifasciata, F.) by gradations. 



Adicella filicornis, Pict. — Source de I'Orbe, 1 S . 



CEcETis ocheacea, Curt. — Lac de Joux, near Le Sentier, 1 $ . 



KYDROPTILID.m. 



OxYETHiRA C03TALIS, Curt. — Lac dc Joux, common, but only one <? brought home. 



Hydropsychidm. 



Hydeopsyche pellucidula. Curt. — Cascade du Day and Source de I'Orbe, a few. 



Philopotamus ludificatus, McLach. — Abundant at a streamlet running into the 



Lac de Joux at Le Pont ; also elsewhere. 

 DoLOPHiLUS copiosus, McLach.— Sourcc de I'Orbe, not common. 

 Cyenus teimaculatus, Curt. — Lac Brenet, 1 S • 

 TiNODES DiTES, Pict. — In great pi'ofusion at rapid streamlets ; also Source de 



I'Orbe. 

 Chimarrha maeginata, L. — One example on shore of Lac de Joux. 



RlIYACOPHlLID.^. 



Rhyacophila toeeentium, Pict. — Source de I'Orbe, 1 ? . 



Ehyacophila dorsalis, Curt. — Source de I'Orbe, 2 $ . 



Rhyacophila pr^morsa, McLach. — Source de I'Orbe, 2 $ . 



Rhyacophila aurata, Brauer. — At a rapid part of a streamlet having its source 

 at a tourbiere at the foot of the Dent de Vaulion, a tributary of the Orbe, 

 running parallel with the road from Le Pont to Vallorbe, 1 (J . I was surprised 

 to find this insect in the Jura. Its home appears to be in the Austrian Alps, 

 but it is already known as Swiss. The example has the anterior wings less 

 bright than in those from Austria, and more reticulated with darker markings. 



Rhyacophila vulgaris, Pict. — 6 (J , 1 ? , Source de I'Orbe. One very large ^ 

 from La Lionne at L'Abbaye, Lac de Joux. 



Rhyacophila philopotamoides, McLach. — 1 $ at the same stream as Rh. aurata. 

 New for Switzerland. A widespread species, but so far never found in abundance. 



Rhyacophila teistis, Pict. — Abundant at rapid streamlets ; also Source de I'Orbe. 



G-LOSSOSOMA BoLTONi, Curt. — Source de I'Orbe, 1 S . 



Synagapetus dubitans, McLach. — Meadow at N.E. end of Lac Brenet, 2 imma- 

 ture ? . 



