239 [March, 



vum, supra fasciis iiigro-fuscis, infra fasciis griseis, primiim ejus seg- 

 menfum supra et ad latera niveum. Vertex dimidia latitudine vice longior, 

 margine posfico subrecto, foveoUs duahus magnis, trigonis, plerumque 

 ohscuris. Coni frontales longitudine verficis, valde proclives, apice 

 acuti,non divergentes. Clypeus niger. Antennce hasin alarum posticarum 

 paiilo superantcs, nigrcs, apex articuli secundi et fere totus articulus 

 terfius testacci, articulus tertius If — 2 tarn lonqus quam quartus. Pro- 

 notum in medio paulo hrevius quam ad latera, circiter \ longitudinis 

 verticis cequans. Elytra hyaliiia, nervis fuscescentihus, 2| tarn longa 

 quam lata, extra medium maxima latitudine, margo anterior cum pos- 

 teriore apice angulum subrectum formans ; nervus clavalis in medio 

 puncto atro ; pars hasalis suhcostce \ elytri longitudinis cequans ; radius 

 hasi fere rectus, apicem versus curvatus et costce suhparallelus ; pars 

 radialis costce 3 — 3^ tarn longa quam pars discoidalis ; hcec plerumque 

 f tarn longa quam ramus furcalis quartus ; ramus furcalis tertius \\ — 

 1^ tarn longics quam primus ; jy^tiolus furccs primce 2\- — 3 tam longus 

 quam ramus furcalis 2Jrimus, qui paulo extra medium in marginem pos- 

 teriorem olliqite excurrit. Alee hyalince, earum appendix hasi macula 

 ohlonga, atra. Pedes anteriores et medii nigri, posteriores flavo-alM- 

 cantes. Lamina genitalis maris hrunnea, utrinque j^rocessu longo, recto, 

 forcipem ohtegente. Forceps nigra, tam alta quam lamina genitalis, 

 angustissima et antrorsum curvata. Yalvulce femincB cequali longitudine, 

 segment i prce cedent is longitudinem cequantes, acuminatce, inferior nigra, 

 superior fiava vel rtfa, apice atrata. 



Long. carp, maris etfcmince 2 — 2"2 onm. 



Habitat in Salice purpurea. 



Austria. 



More detailed descriptions o£ tlieae three species and of their 

 biology, illustrated with figures, will appear in the Verhaudlungeu der 

 zoologisch-botanischen Gesellschaft in Wien. 



Wiedcn, Hauptstrasse 47, Yienna-: January 10th, 1878. 



Note on the genus Aleurodes. — The only species known to Linn6 waa so like a 

 small moth that it was considered by him to be Lepidopterous, and he described it 

 under the name of Phalmna-Tinea proletella. It was also taken to be Lepidopterous 

 by subsequent authors ; eren Ke'aumur, who gave an excellent description of the larva 

 and accurately observed its mode of life, contented himself with saying that the 

 structure of the rostrum is altogether so different from that of other Lepidoptera 

 that this alone might be deemed sufficient to characterise a new class of FhalancB. 

 So it continued to be placed among the Lepidoptera until Latreillc, in 1795, dis- 

 covered that it belonged to the Homoptera, an^ placed it with the Aphidina. 



