This extensive family, belonging to the HETEROMEROUS SECTION of the Order, in its widest extent, as catalogued by Gemminger and Von Harold, comprises more than 4500 described species, many of the largest and finest of which are peculiarly African, such as _Chiroscelis_ and its allies (of which I published an illustrated monograph in the “Transactions of the Zoological Society,” vol. iii. 1849), and the gigantic species of _Moluris_, such as _M. Bertolonii_, Guérin, from Mozambique; _M. Rowleiana_, Westw., from the Zambesi; _M. gravida,_ Damara Land; and _M. Procrustes_, Delagoa Bay, illustrated in my paper in “Trans. Ent. Soc.” 1875, pl. 6. Many of these insects, which are especially natives of large sandy districts, were captured by Mr. Oates, including _Moluris Perretii_, _M. gibbosa_, _M. albipes_, etc., _Dichtha inflata_, Gerstaecker, _Anomalipus lineatus_ and _intermedius_, _Hypomeles rugosus_, Fabricius, etc. Numerous smaller species of MELASOMATOUS HETEROMERA, and HELOPIDÆ, were also taken, as well as ten species of MYLABRIDÆ. Family HELOPIDÆ. Amongst the HELOPIDÆ, apparently allied to _Centronipus_ and _Stenochia_, is an insect captured by Mr. Oates, which must be referred to a new Genus, Genus DEROSPHÆRIUS, Westw. Corpus oblongum, subcylindricum; capite parvo, conico, ante oculos utrinque rotundato-elevato, antennis longitudine dimidii corporis, articulis æqualibus, externis paullo brevioribus at non crassioribus; mandibulis capitis longitudine æqualibus curvatis, supra prope basim cornu erecto, apice inciso, armatis; labro subrotundato, antice emarginato; palpis maxillaribus elongatis, articulo ultimo vix securiformi; mentum transversum antice angustatum; palpis labialibus parvis, subcylindricis; prothorax rotundatus, subglobosus; pedes satis graciles; tarsis heteromeris, simplicibus, unguibus simplicibus. DEROSPHÆRIUS ANTHRACINUS, Westw. (Plate G, fig. 3, and Plate H, figs. 2, 2_a_, 2_b_, 2_c_.) Niger nitidus, capite inter antennas biimpresso, pronoto subtiliter punctatissimo; elytris punctato-striatis. Long. corp. fere lin. 6. Family CURCULIONIDÆ. Of the still more extensive family of the Weevils (Genus _Curculio_, Linnæus), of which, including the SCOLYTIDÆ, BRENTHIDÆ, and ANTHRIBIDÆ, not fewer than 1200 species have been described, large numbers are peculiarly African, especially the great Genera _Brachycerus_, _Episus_, _Microcerus_, _Platycopes_, _Sciobius_, and many others, the species of most of which are distinguished by their dull colours and sluggish movements, fitting them for their existence in wide arid sandy districts, where they emulate the _Pimeliæ_ and _Molurides_. Of this great tribe only nine species were captured, including numbers of individuals of the gigantic _Brachycerus apterus_, remarkable for the red spots on its black body, _B. congestus_, etc. Family CERAMBYCIDÆ.