. Economic entomology. Beneficial insects; Insect pests; Thysanura. 348 ARACHNOIDEA. CASE five-jointed" (as shown in the. above woodcut, copied from Dr. Low's figure), "which five joints comprehend the coxa, femur, a. Tail of Phytoptus. very short tibia, and two-jointed tarsus. The terminal joint of the tarsus, which is longer than its first, and somewhat knobbed at the end, bears a long round claw, which is only a little thickened and obtusely rounded at the tip. Beside this claw, inclined towards .the inner side, is a feathered organ for holding on by, which has on each side five g
. Economic entomology. Beneficial insects; Insect pests; Thysanura. 348 ARACHNOIDEA. CASE five-jointed" (as shown in the. above woodcut, copied from Dr. Low's figure), "which five joints comprehend the coxa, femur, a. Tail of Phytoptus. very short tibia, and two-jointed tarsus. The terminal joint of the tarsus, which is longer than its first, and somewhat knobbed at the end, bears a long round claw, which is only a little thickened and obtusely rounded at the tip. Beside this claw, inclined towards .the inner side, is a feathered organ for holding on by, which has on each side five gradually diminishing ; Claw of Phj-toptus (Typhloch-omus) pyri. Claw of Phytoptus (Flexipalpus) tiliEe. Copied from Sdeuteii. Copied from Scheuten. This "haftorgan," or boat hook, as it were, differs in different species. The two figures taken from Scheuten, which we here give, show respectively its different forms in the different Phytopti specified under each, viz., with one hook in Typhlodromus pyri, two in Flexipalpus tiliae, and there are five in that of the gall of Bromus mollis. We are strongly inclined to suspect that the right interpretation has not been put upon these organs. What does the animal want with another soft claw alongside the harder boat-hook? As we read it, the boat-hook is the claw, and the longer so-called claw is a sucker, like those of the Sarcoptidse. We can point to an exact parallel to this ar- rangement of sucker and claw, and nearly in the same pro- portionate dimensions, in the termination of the leg in Symbiotes bovis, and Psoroptes equi among the Sarcoptidse (see the wood- cuts of these species). Again, the reader knows that it is an almost universal peculiarity of the Sarcoptidae (so much so, that we have used it as a family character) to have the body finely. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these i
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