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Show 746 MR. 0. J. GAHAN ON COLEOPTERA [Dec. 5, It is very difficult to decide the limits of a species in inasmuch as the colours not only vary to a considerable extent, but the punctuation also is by no means constant. As, however, I have not seen examples of the form described above from any other locality, I have thought it well to give it a name. 49. COLASPOSOMA CYANEOOUPREUM, Fairm. Colasposoma cyaneooupreum, Fairm. Ann. Soc. Ent. Fr. (6) vii. (1887) p. 352. Two examples. 50. COLASPOSOMA, sp. 51. CERALCES FERRUGINEUS, Gerst. 52. CERALCES NATALENSIS, Baly. 53. ATECHNA CLARKI, Baly. 54. OIDES COLLARIS, Baly. 55. DlACANTHA DISTINCTA, sp. 11. Capite prothoraceque fulvescentibus; elytris crebre punctatis, cyaneis (tuberculis ad basin in mare fulvis, exceptis) ; (basi exceptis) pedibusque nigris ; corpore subtus nigro, ultimo fulvo. Long. 9-10 mm. Hab. Zomba, Moimba ?, and Zambesi. The basal tubercles of the male elytra resemble those of B. conifer a, Fairm., but are not quite so strong and prominent. Very close to the hind margin of the pronotum there are, in the male, two small lunate pits or depressions-one on each side of the middle line nearly opposite the elytral tubercles. At the middle of the hind margin the pronotum does not send back a distinct process to overlap part of the scutellum, as happens in the males of some species of this genus. These characters of the male, together with the close and rather strong punctuation of the elytra in both sexes, will suffice to distinguish the species. One male example only was in the collection made by Mr. Whyte at Mount Zomba; a male and two females ticketed " Moimba " and a male from Zambesi are also in the British Museum collection. 56. DIACANTHA CONIFERA, Fairm. Biacantha conifera, Fairm. Ann. Soc. Ent. Belg. xxvi. (1882) p. lvi. Numerous examples, most of which have arrived in a very bad condition, are in the collection from Zomba. The species is also well represented in the British Museum collection by specimens from "Moimba" and Mamboia (Baly Coll.) and from Lake Ngami. It is doubtful whether it is to this species or to the one which I |