. Bulletin of the Illinois State Laboratory of Natural History. Natural history. 364 the head and prothorax are velvety-black and without luster, due no doubt to the microscopic reticulation. At Muncie, Illinois (the only locality from which I have seen speci- mens) this species was very abundant upon the hop tree (Ptelea tri- foliata). As many as fifty individuals were frequently observed on the under surface of a single leaf, where their peculiar coloration rendered them very conspicuous. Suborder TUBULIFERA Haliday.* Family PHLCEOTHRIPID^ Uzel. Genus Zygothrips Uzel, 1895. Zygothrips longic
. Bulletin of the Illinois State Laboratory of Natural History. Natural history. 364 the head and prothorax are velvety-black and without luster, due no doubt to the microscopic reticulation. At Muncie, Illinois (the only locality from which I have seen speci- mens) this species was very abundant upon the hop tree (Ptelea tri- foliata). As many as fifty individuals were frequently observed on the under surface of a single leaf, where their peculiar coloration rendered them very conspicuous. Suborder TUBULIFERA Haliday.* Family PHLCEOTHRIPID^ Uzel. Genus Zygothrips Uzel, 1895. Zygothrips longiceps sp. no v. (Fig. 2). Female.—Similar to Z. minutus Uzel, from which it differs as follows: I. Length about mm. head about times as long as wide, half as long as antennae, and about times as long as tube. Anterior marginal spines on prothorax large, subequal in length to the others. Posterior margins of abdominal segments 3-7 provided each with two pairs of straight spines, the inner pair short. Tarsi light yellow, tibiae yellowish, the first and third pairs clouded at base, and the second pair at middle, with brown or black Z. minutus Uzel. aa. Length about mm. Head about times as long as wide, three-fifths as long as antennae, and almost twice as long as tube. Anterior marginal spines on prothorax wanting. Posterior mar- gins of abdominal segments 3-6 pro- vided each with two pairs of long spines, the inner pair sigmoid. Tibiae and tarsi uniform bright yellow Z. longiceps sp. Fig. 2 Zygothrips longiceps, female, head and prothorax. (J. D. H., del.) The measurements of the female of this species are as follows: Total length mm.; head, length .192 mm., width .134 mm.; prothorax, length .123 mm., width (including coxas) .232 mm.; ptero- thorax, width .234 mm.; abdomen, width .272 mm.; tube, length .102 *The division of the Tubulifera into the two families PhloeothripidcB and Idolothripidce, proposed by R. S. Bagnall (Ann. and Mag. of Nat. Hist
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectnatural, bookyear1876
