[ 543 ] XXXII. Descriptions of some new Species o/"Diopsis. By JO. Westwood, Esq., F.L.S., <S-c. Read November 3rd, 1835. Having since the publication of ray monograph upon the Dipterous genus Diopsis in the 2nd part of the 17th volume of the Transactions of the Linnean Society, met with some new species of that remarkable genus in several of the Continental cabinets which I have recently examined, I beg leave to offer the descriptions of them to the Linnean Society by way of supplement to my mo-nograph. Species ad Sectionem p-imam pertinentes. Species 22. (vel la.). Diopsis Wiedemanni, mihi. Tab. XXVIII. Fig. 1. D. capite medioque abdominis rufescentibus, thorace nigro, spinis 2 scutella-ribus et 4 thoracicis flavidis, alis fuscescentibus in medio obscurioribus macula ante apicem sublunari. Long. corp. lin. 4. Habitat in Guinea Africae. In Mus. Wiedemann. Magnitudine et affinitate D. IchneuTuonece proxima, a qua autem differt alis fuscescentibus, abdominis basi nigra thoraceque 4-spinoso. E pedunculis oculiferis abdomineque hand clavato insectum masculinum indicatur. Caput rubrum, os versus attenuatum, et utrinque spina acuta perpendiculari armatum, pedimculi oculiferi graciles, thorace paull6 longiores. Thorax niger, collar! nitido, scutelloque concolori ; spince 2 scutellares elongatae, 2 mesothoraciciE et 2 metathoracicBe abbreviatse, flavse. Abdomen elon-gatum baud clavatum, sensim ultra medium latins, basi nigra, medio rufo apiceque rufescenti-fusco. Pedes rufescentes, femoribus anticis incrassa-tis, posticis 4, ad apicem 1-subspinosis ; tibiis anticis subtfls obscurioribus.
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