. The Cambridge natural history. Zoology. 192 COLEOPTERA they are placed partially in the thorax. The diminution in number takes place in this case by the amalgamation of the first two abdominal with the last thoracic ganglia. Fam. 1. Passalidae.—Labrum large, vioiile ; mentum dee'ply cut out in the middle for the accommodation of the ligvla; the lamellae of the antenna brought together by the curling tip of the antenna. The elytra entirely cover the dorsal surface of the cthclo- men. There are four or five hundred species of this family known ; they are usually shining-black, unattractive bee
. The Cambridge natural history. Zoology. 192 COLEOPTERA they are placed partially in the thorax. The diminution in number takes place in this case by the amalgamation of the first two abdominal with the last thoracic ganglia. Fam. 1. Passalidae.—Labrum large, vioiile ; mentum dee'ply cut out in the middle for the accommodation of the ligvla; the lamellae of the antenna brought together by the curling tip of the antenna. The elytra entirely cover the dorsal surface of the cthclo- men. There are four or five hundred species of this family known ; they are usually shining-black, unattractive beetles, of large size, / J. Fig. 86.—View of one .side of nieso- and metathorax of a Passalid larva fron; Borneo showing the stridulating c, b. Portions of the metathorax ; c, coxa of 2nd leg; (/, striate or stridulating area thereon ; e, basal part of femur of middle leg ; /, hairs with chitinous pro- cess at base of each ; (/, the diminutive 3rd leg modified for scratching the striated area, x 20. and are abundant in the decaying wood of tropical forests. They are quite absent from Europe, and there is only one species in the United States of North America. The larvae are very interesting, from the fact that they appear to Irave only four leos. This arises from the posterior pair being present only as very short processes, the function of which is to scrape striated areas on the preceding pair of legs and so produce sound. In the species figured (Fig. 86) this short leg is a paw-like structure, bearing several hard digits; but in other species it is more simple, and without the digits. The perfect Insect has no sound-producing organs, and it is very remarkable therefore to find the larvae. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harmer, S. F. (Sidney Frederic), Sir, 1862- ed; Shipley, A.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
