. Economic entomology. Beneficial insects; Insect pests; Thysanura. SNOUTED MITES. 143 CASE Statement of such diversity, accompanied with no corresponding differences of other structure, would seem to show that in this group the presence, absence, or number of eyes was not a matter of generic importance; and as we go along we shall see other instances of the same thing in other famiHes of mites and insects. There are many species of insects found in the deep and obscure recesses of limestone caverns, or other dark places, which have no eyes. The spot where the eyes should be is smooth, and to
. Economic entomology. Beneficial insects; Insect pests; Thysanura. SNOUTED MITES. 143 CASE Statement of such diversity, accompanied with no corresponding differences of other structure, would seem to show that in this group the presence, absence, or number of eyes was not a matter of generic importance; and as we go along we shall see other instances of the same thing in other famiHes of mites and insects. There are many species of insects found in the deep and obscure recesses of limestone caverns, or other dark places, which have no eyes. The spot where the eyes should be is smooth, and to the naked eye identical with the neighbouring surface, but some of them beyond doubt belong to well-known and unmistakeable genera which have eyes. These organs would appear, therefore, not to be entitled to rank among the structural organs which dis- tinguish important divisions of living beings. Genus Molgus ? {Dujard). Mouth or quasi-head without a constriction or neck behind it. No. I. Molgus longicornis {Linn.), (Ac. Basteri, Johnston), Acarides of Ber- wickshire, in History of Berwick, Nat. Club, ii. 227.).â!. Magnified sketch of ditto. As already said this probably belongs to Dujardin's genus Mol- gus. It occurs in Berwickshire, in Northumberland, and other parts of England, where it is â ,^ ^,,, , . â . ^c ^ *â *-" ' Mouth of Molgus longicornis. Copied from Dr. common on the sea-shore during johnston-s figure. the summer months, running quickly about among stones above high-water mark. It is scarlet, with the body blood red, and as if divided into several large sub quadrangular compartments, formed apparently by a thickening of the skin, pear-shaped, about an eighth of an inch in length : in fact very like the small weevil called Apion ir shape and 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 orig
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