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Show 1870.] REV. O. P. CAMBRIDGE ON THE GENUS IDIOPS. 101 SEMIPLOTUS MODESTUS, sp. nov. B. iii. D. 4/20. P. 15. V. 9. A. 3/6. C. 19. L. 1. 32-34. L. tr. 7\I7\. Length of head |, of caudal -|, height of body nearly \ of the total length. Eyes. Diameter \ of length of head, 1 diameter from end of snout, 1 \ diameter apart. Snout broad, obtuse, with several open pores on either side. Mouth transverse, inferior. The posterior extremity of the maxilla extends to beneath the middle of the orbit. No horny substance on the jaws. Lower jaw not covered by lip. A knob at the symphysis. Slight motion between the maxillary and intermaxillary bones. No barbels. Teeth pharyngeal, 4, 3, 2/2, 3, 4. Colours. Silvery, darkest in the upper half of the body. Ventrals and anal tipped with orange. Hab. Hill-ranges of Akyab, whence Col. Stevenson procured for me two specimens, of 4| and 5| inches respectively in length. Remarks.-This species appears intermediate between the genera Semiplotus and Cyprinion; for it nearly agrees with the former in the slight motion of the upper jaw, absence of barbels, &c, whilst it likewise resembles the latter in having a serrated dorsal spine, although it has no horny edge to the lips or barbels. However, those two genera, with this intermediate species, appear to pass so naturally one into the other that I would suggest they should only be regarded as subgenera. 4. Monograph of the Genus Idiops, including Descriptions of several Species new to Science. By the Rev. O. P. CAMBRIDGE. (Plate VIII.*) In publishing descriptions of new species of a little-known genus, it seemed a fit opportunity to incorporate with them the substance of what has already been made known upon the subject by Continental arachnologists; the present paper will therefore comprise the characters of the genus, and of the only two species of it hitherto known, in addition to the descriptions of the new species. The genus Idiops was first characterized (in 1830) by M. Perty (Del. An. Art. Bras. p. 197); but it appears to have been overlooked by Baron Walckenaer, who seems to have hastily concluded M. Perty's spider to have been a species of the genus Sphasus (see Walck. Ins. Apt. torn. i. p. 379, Paris, 1837). It is surprising that Walckenaer should not have recognized in M. Perty's figures and lucid description a species of a new and well-marked genus of the family * For description of this Plate, see tbe end of the supplementary paper on the same subject, below p. 157.-ED. |
