1G2 [J"iy. 



Perlid^. PSEUDO-NEUEOPTEEA. 



Dictyopteryx intricata, Fict. : — Poiitresina, Gr. C. C, very large and dark. 



D. alpina, Pict. :— G-uai'da, Pontresina [Davos], G. C. C, many examples of large 

 size and very strongly marked. — — D. fontiiim, Eis : — Gruarda [Davos and Eagatz], 

 Gr. C. C. I had this species (not then recognised) in view when I penned my 

 remarks on D. alpina in Ent. Mo. Mag., xvii, p. 221. 



Chloroperla rlvulorum, Pict. : — Pontresina, Guarda [Davos], G. C. C. 



Isopteryx moiitaua, Piet. :— Pontresina, G. C. C. [tripunctata, Scop. : — 



Davos, G. C. C] 



Tanioptert/x nef/lecla, Albarda : — Pontresina and Guarda, very common, G. C. 

 C, all females. 



Also some undetermined Nemoitrce and Leuctrcv. 

 Ephemeridje. 



Cloeon dipterum, L. : — Pontresina, T. A. C, subimago. 



\_Rhithrogena semicolorata, Curt. :^Davos, G. C. C.]. 



IScdyurus veno.ius, F. : — Pontresina, G. C. C, T. A. C. These examples are of 

 unusually large size, and wore no doubt from the intensely cold Lac St. Moritz, at 

 which lake I found the same form in abundance in 1880. 

 Odonata. 



Sympetrum striolatnni, V. d. L. : — Guarda, G. C. C. S. ffnpeo/um, L. : — 



Guarda, very common, G. C. C. 



l^Jischna vyayiea, Miiller : — Eagatz, G. C. C.]. 



Lestes drya.s, Kby. (iii/mpha, Selys) : — Guarda, G. C. C. L. harhara, V. d. 



L. : Guarda, G. C. C. 



Lewisham, London : May, 1901. 



A NEW SPECIES OP TRICHOPTERA FEOM SWITZEELAND. 



BY ROBERT McLACHLAN, F.R.S., &c. 



Early in April, 1899, Dr. Chapman collected a few Trichoptera at 

 Locarno (Ticino) which he kindly gave to me. Amongst them was a 

 single (J of a Drusus- that appeared to be new. Thinking it might be 

 known to Dr. Ris, but undescribed, I submitted the example to him, 

 be did not know it, and agreed with me that it represented a new 

 species ; he also kindly sup])lied the accompanying drawings. 



Drusus Chapmani, n. sp. 



Belongs to the group of black species represented by D. Mnelleri, McLachlan, 

 D. nigrescens, Meyer-Diir, and D. me/ancJiafes, McLachlan ; most allied to D. 

 MueUeri. 



Body black, neck with golden hairs. Antennae black. Legs blackish, but with 

 close fine golden pubescence, giving them a golden sheen. Anterior wings black when 

 fresh, but soon fading to leaden-grey, without any small pale points, but with a 

 conspicuous white spot at the thyridium and another at the arculus ; neuration 

 black. Posterior wings grey, darker towards the apex, and with darker fringes; 



