. Bulletin. Natural history; Natural history. 839 the siftings on a. Hat dish suspended over a large funnel, and placing the funnel and all in the sunlight. The sunlight drives the mites out of the siftings, and they fall through the funnel into a vial below. The most convenient and satisfactory mounting media for oribatids are Canada balsam and dammar balsam. Dissections of the month-parts are frequently necessary. Material must often be rendered partially transparent by means of potassic hydrate or eau de Labrraque. In making the drawings I used an Abbe camera lucida. The measurements
. Bulletin. Natural history; Natural history. 839 the siftings on a. Hat dish suspended over a large funnel, and placing the funnel and all in the sunlight. The sunlight drives the mites out of the siftings, and they fall through the funnel into a vial below. The most convenient and satisfactory mounting media for oribatids are Canada balsam and dammar balsam. Dissections of the month-parts are frequently necessary. Material must often be rendered partially transparent by means of potassic hydrate or eau de Labrraque. In making the drawings I used an Abbe camera lucida. The measurements were made with an ocular micrometer. External Anatomy. The body in the Oribatoidca (Fig. 1) consists of an anterior narrower region termed the cephalothorax, and a posterior, much larger, portion termed the abdomen. The union of these two regions is more in- timate in some genera than in others. There is usually an evident division between the cephalothorax and the ab- domen except in the genera and Anicnis. In two genera, llDphxIcniKi and PhthirdcdfKs, the cephalo- FiG. 1. z>a//(.t7(.s/('7('/(.s, dorsal view. tliorax IS hinged to the ab- domen in such a way that the former can be folded down against the ventral surface of the latter. The cephalothorax may be divided into - â ^'^â¢''⢠two parts; the rostrum (Fig. ], 7^.) and the posterior portion. The rostrum is the anterior hood-like portion wdiich protects the mouth-parts. Upon the rostrum is found a pair of stout hairs termed rostral ^^^^^ orii.,ta Und-si,^^^,. hairs (Fig. 1, H'k //.); sometimes the 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 Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division
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