OCR Text |
Show 240 MR. G. A. K. MARSHALL ON THE [Mar. 20, relation to sex, but in cinereus, dealbatus, cognatus, opalinus, prasi-nus, and wahlbergi there is practically no difference; while in obesus, scapularis, and horni the distinction is comparatively slight. The present revision has only been rendered possible by the generous assistance afforded m e by many friends. To the Trustees of the British Museum I am much indebted for their kindly permitting m e to bring out to Africa practically the whole of the material contained in the National Collection ; and m y thanks are particularly due to Mr. G. J. Arrow of that Institution for much valuable assistance, especially in supervising the drawing of the insects and correcting the proofs of this paper. M y friend Prof. Dr. Sjbstedt of Stockholm was good enough to lend me typical examples of no less than 19 species described by the old Swedish authors, thus immensely facilitating the labour of identification and ensuring more accurate determination. Dr. D. Sharp of Cambridge, Prof. Poulton of Oxford, Mr. Peringuey of Cape Town, and Dr. Schonland of Grahamstown, all generously placed at m y disposal the whole of the examples of this genus which were to be found in the collections of which they are respectively in charge. M y fellow-collectors in South Africa, Mr. C. N . Barker and Father O'Neil, have kindly contributed to m y needs in their usual open-handed manner; while m y good friend Dr. W . Horn of Berlin has most liberally procured for m e quite a remarkable number of new and rare species, two of which I have not seen in any other collection. The following synoptic Table, despite its many shortcomings, will probably render identification somewhat easier. Specierum Conspectus*. Prothorax basi utrinque fovea elongata aut rotundata evidenter impressus. Funiculi articulus tertius primo non, aut vix, longior. Genae processu recurvo valde productae. Elytra late ovata, liumeris rotundatis, prothorax a>qualiter granulatus; antenna? breviores,clavaovata. 1. S. granosus Fahr. $. Elytra anguste ovata, humeris valde obliquis; prothorax medio obsolete granulatus; antennae longiores, clava valde elongata et acuminata 2. S. cultratus, sp. nov., $. Genae non recurvo-productae. Genae acute angulariter dilatate. Major (9£-10| m m . ) , thorace apice constricto. 3. Minor (7-8 m m . ) , thorace apice non constricto. 5. Genae rotundatae aut obtuse angulata?. Antennae longiores, funiculi articuli terminales evidenter longiores quam latiores. Elytra late ovata, humeris rotundatis, prothorax et elytra undique aequaliter granulata \. S. granosus Fahr. $ . Elytra anguste ovata, humeris valde obliquis; prothorax medio parum elevatus ibique obsolete granulatus; elytra retro obsolete granulata 2. S. cultratus, sp. nov., ? 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. (32.) 1 (19.) (6.) (5.) (4.) (3.) (10.) (9.) (8.) (7.) (14.) (13.) (12.) S. cinereus, sp. nov. S. dealbatus Fahr. * It must be noted that two species with which I a m acquainted, viz. S. lateralis Boh. and S. muricatus Boh., are not included in this Key, owing to the fact that several of the diagnostic characters here utilised are not mentioned in Boheman's descriptions. |