. Bulletin of the Illinois State Laboratory of Natural History. Natural history; Natural history -- Illinois. 340 Max. Lin".. Max. I. Fig. 3. Oribata banksi, mouth-parts. rostrum bears an additional pair of hairs. Underneath the rostrum may he seen the mouth-parts, which consist of man- dibles (Fig. 2), palpi (Fig. 3, Pa.), maxilla? (Fig. 3, Max.), and the maxillary lip (Fig. 3, Max. I.). From the maxillary lip project the maxilla? and the palpi. The maxilla? are curved and blade-like, and are large and highly developed in the genus Hoploderma. The palpi consist usually of five segments,
. Bulletin of the Illinois State Laboratory of Natural History. Natural history; Natural history -- Illinois. 340 Max. Lin".. Max. I. Fig. 3. Oribata banksi, mouth-parts. rostrum bears an additional pair of hairs. Underneath the rostrum may he seen the mouth-parts, which consist of man- dibles (Fig. 2), palpi (Fig. 3, Pa.), maxilla? (Fig. 3, Max.), and the maxillary lip (Fig. 3, Max. I.). From the maxillary lip project the maxilla? and the palpi. The maxilla? are curved and blade-like, and are large and highly developed in the genus Hoploderma. The palpi consist usually of five segments, and as a rule are very small; in the genera Phthiracarus and Hoploderma, however, they are large. On the posterior part of the cephalothorax are found the following organs: pseudostigmata, pseudostigmatic organs, lamella?, lamellar hairs, interlamellar hairs and sometimes a translamella, and often one or more pairs of tectopedia, The pseudostigmata (Fig. 4, Ps.), formerly supposed to be the true stig- mata, are situated near the abdominal margin and usually close to the lateral margin of the cephalothorax. They are of Fig. 4. various forms, though usually cylindrical or funnel shaped. From each pseuclostigma pro- jects the pseudostigmatic organ (Fig. 4, Ps. org.). This may- be filiform, fungiform, setiform, clavate, or subglobose, and is often pectinate or dentate. The lamella? consist of either blade-like chitinous projections, or of mere ridges. They vary greatly in size and shape, and are situated on the dorso-lateral part of the cephalothorax. Sometimes the la- mella? project in a free end which may extend to the apex of the rostrum or even beyond it. From the tip of the lamella? pro- ject a pair of prominent bristles, termed the lamellar hairs. The tectopedia, of which there may be as many as three pairs, are generally blade-like, are situated on the sides of the cephalothorax, and have either a tactile function or serve to protect the coxa?.. Please note that these images
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