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Record: oai:ARNO:508486

AuthorC. Ritsema Cz.
TitleFour new species of exotic Coleoptera
JournalNotes from the Leyden Museum
AbstractLength with mandibles 27,5 mm., that of the left mandible (which is a little longer than the right one) 8 mm. — Ground-color black, covered all over (with the exception however of the tip, the inner margin and the undersurface of the mandibles, the tip of the cephalic horn, and the clypeus) with a delicate brownish grey crust which does not hide the punctuation. The uppersurface of the mandibles, the margins of the thorax and of the elytra, and the scutellum, are densely beset with pale dirty yellow scales; moreover very small scales are present on the whole undersurface, whereas a small number of larger scales are arranged in ten longitudinal rows on the elytra. The tibiae seem to be sharply edged which is caused by rows of densely set erect scales The punctuation of the head is quite similar to that of the thorax; the punctures are round and rather large, very shallow and provided with a point in the centre. The punctures on the elytra are smaller, deeper and more regularly distributed over the surface.
The head is large, larger than the thorax; the sides are nearly straight, subparallel, inconspicuously convergent towards the base; the ocular canthus is narrow, straight on the outside, and entire; the space between the eyes and the produced lateral angles of the thorax is flattened in a perpendicular direction; the front margin of the head is regularly concave, perforated in the middle (above the bidentate clypeus) by a large and deep circular hole, and has the lateral angles rounded; the vertex is provided with an elongate horn which is directed forwards, and slightly curved downwards at the tip. The mandibles are slender, about as long as the head and thorax together, slightly curved, furcate at the tip; the upper tooth of the furcation very blunt and curved, the lower tooth pointed and more developed in the right than in the left mandible; the furcation is preceded in both mandibles (of which the right one is a little shorter than the left one) by two teeth of different size; in the left mandible the distance between these teeth and the furcation is considerably larger than in the right one, and in the latter the median or smaller tooth is only indicated by a small tubercle; on the uppersurface of the apical half of the mandibles a raised smooth line may be observed. — The prothorax anteriorly a little wider than the base of the head, the latter being more or less embayed between the anterior angles which are produced and rounded; the front margin is bisinuate, the basal margin straight with rounded lateral angles; the sides are straight, convergent towards the base. In the hind corners an oblique impression is present; it touches the basal margin and is bounded laterally by two divergent ridges. The middle of the disk is flattish. — The elytra are about as broad as the base of the thorax, and one and a half as long as broad. — The prosternum is longitudinally impressed between the coxae. The rather short anterior tibiae are armed on the outer margin with five teeth (besides the two apical ones) of which the first is very small and the second and fourth smaller than the third and fifth; the four posterior tibiae are armed in the middle on the outside with a spine which is very distinct on the middle legs, but almost not noticeable on the hind pair.
Document typearticle
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