Guide to the study of insects, and a treatise on those injurious and beneficial to crops: for the use of colleges, farm-schools, and agriculturists . ith some black hairs and a subfuscous spot oneach side of the thorax. It comes from Hudsons Bav. Another curious Neuropterous insect found in the iron-stoneconcretions of Morris, 111., is the Megathentomum pustulatumof Scudder (Fig. 617, natural size), described and figured byhim in the Palaeon-tology of the IllinoisState Geological Sur-vey. The fragmentrepresents a wing (ap-parently an upper one)of a Neuropterous iirsect. It is gigantic insize,
Guide to the study of insects, and a treatise on those injurious and beneficial to crops: for the use of colleges, farm-schools, and agriculturists . ith some black hairs and a subfuscous spot oneach side of the thorax. It comes from Hudsons Bav. Another curious Neuropterous insect found in the iron-stoneconcretions of Morris, 111., is the Megathentomum pustulatumof Scudder (Fig. 617, natural size), described and figured byhim in the Palaeon-tology of the IllinoisState Geological Sur-vey. The fragmentrepresents a wing (ap-parently an upper one)of a Neuropterous iirsect. It is gigantic insize, very broad, withdistant nervures, sim-ple infrequent divarica-tions, and in the outerhalf of the wing, whichalone is presented, across neuration, composed solely of most delicate and irregu-lar veinlets. The wing is also furnished with a great numberof larger and smaller discolored spots, the surfaces of thelarger ones irregularly elevated. Mr. Scudder thinks thewing is allied to that of Coniopteryx, adding it appears tobelong to a family hitherto nndescribed. I do not know of asingle insect, living or fossil, which approaches it in the struc-. Fiff. (,17. ture of the wings. <;,:_L THYSANURA. THYSANURA. The Thysauura arc wingless, ami undergo no metamor-phosis. There is a great range in the degree of complexityof structure from Lepisma, the latter resembling a larvalPerla or Blatta, to Aniira. The higher group, or bristle-tails,which we may call Ct/ntro, comprises the families Lepismatidteand (aa/podev. Lubbock has applied the term Collembola tothe Podurida1 and Smynthurida-, in allusion tothe sucker-like organ situated at the base of theabdomen. The Ciiniru are characterized byiheir well-developed month-parts, abdominalfeet and bristles or cerci, and the Collembolaby their spring (elatei), its holder (tenaculum,Fig. 617), as well as the sucker or coUophore,as it may be termed; by the rudimentary mouth-parts and by their diminutive si/e. These interesting small, wingless for
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Keywords: ., bookcentury1800, bookdecade1870, bookpublishe, booksubjectinsects
