28G MONOGRAPHIA CHALCIDITUM. African genus Manticora, represented on the plains of New Mexico by a cognate genus, Omus ; and on the sandy plains of Chili, the insects much resemble those of Africa, a very considerable portion of the Coleoptera being heteromerous. I am indebted for this information to my kind friend Mr. Walker, who also informs me that many insects from the extreme southern part of America nearly resemble our own. This is exactly what we should be led to infer from the nature of the climate, which may be called insular with as much pro-priety as that of our own country. And now, reader, farewell ! I doubt not that thou hast found many an error in this paper, and hast often exclaimed — " Tramite quo tendis majoraque viribus audes," or something of that sort. These I trust that thou wilt par-don ; and I promise that I will not often, in this way at least, intrude upon thee again ; perhaps never, unless those visions should be realized which have been to me " like the vapour of the plains, which the thirsty traveller thinketh to be water, but when he cometh to it he findeth nothing." Vale! A. Art. XXVII. — Monographia Chalcldltum. By Francis Walker. {Continued from i). 179.) the green myriads in the peopled grass." Family, Pteromalid^e. Corpus plerumque metallicolor aut nigrum : caput et thorax pubes-centia, quasi squamea, nunquam aut rarissime colore pallido variegata : caput breve, trans vers um, thoracis latitudine, mart ssepe magnum thorace latius : oculi mediocres, laterales : ocelli 3, supra verticem trigone dispositi : osoccultum: mandibula? parvsc:
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