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Show 1885.] INSECTS F R O M K I L I M A - N J A R O . 235 the intervals irregular, shining, rugae or granules), moderately narrowed at the base and apex; arcuate at the sides, with no lateral ridge; the front margin nearly straight, the anterior angles not prominent, the base slightly bowed. Elytra not quite twice as broad as the thorax, oblong-ovate, moderately convex ; each elytron with three zigzag shining costae (two dorsal, one lateral), the interstices plicate and rugulose; the suture not costiform. The sides of the elytra shining, the surface uneven and sparingly punctured. Pro-sternal process closely and rather strongly punctured; the meso-and metasterna less so. Abdomen dull, very finely punctured, the punctuation of the apical segment rather stronger. Legs rugose, not clothed with paler tomentum. Length 14-15 millim. The females are rather broader than the males, especially in the elytra, which are more oblong and somewhat flattened dorsally. The males have two very small shining spots on the disk of the thorax in front of the middle, and there is an indication of a fine median line. I have been in doubt whether to place this species in the genus Amiantus or the more recent genus Melanolophus, Fairm. (Faun. et Fl. d. Pays Comalis, 1882, p. 69). The general form is, however, more that of Melanolophus, but the suture of the elytra is not costiform. The anterior angles of the thorax are not produced forward as in Amiantus. The antennae are rather shorter than in either of these genera. HYMENOPTERA, ORTHOPTERA, &c. The other Insects collected by Mr. Johnston do not present anything remarkable. There is, however, a very fine specimen of Mantis (Idolum diabolicum, Saussure), of which a male example in the British Museum is from the White Nile. EXPLANATION OF PLATE XV. Fig. 1. Scarabmus cribricollis, p. 231. 2. Onthophagus johnstoni, p. 232. 2a. Lateral view of thorax of ditto. 3. Calometopus planatus, p. 233. 3a. Front view of head of ditto. 4. Amblysterna johnstoni, p. 233. 5. Psiloptera lata, p. 234. 6. Melanolophus ater, 2 P- 234. |