. An illustrated descriptive catalogue of the coleoptera or beetles (exclusive of the Rhynchophora) known to occur in Indiana : with bibliography and descriptions of new species . Beetles. 1186 FAMILY LIIT.—CHRYSOMETJDiE. LII. DisoNYCHA Chev. 183i. (Gr, "two + ;) Obion- or oval beetles of medium size, having the head inserted as far a/the eyes, front with distinct carina and two tubercles; antennae slender, rarely longer than half the body, the fourth joint longer than third, ex- cept in the species with blue elytra, where the two joints are equal; thorax as wide at base as elyt
. An illustrated descriptive catalogue of the coleoptera or beetles (exclusive of the Rhynchophora) known to occur in Indiana : with bibliography and descriptions of new species . Beetles. 1186 FAMILY LIIT.—CHRYSOMETJDiE. LII. DisoNYCHA Chev. 183i. (Gr, "two + ;) Obion- or oval beetles of medium size, having the head inserted as far a/the eyes, front with distinct carina and two tubercles; antennae slender, rarely longer than half the body, the fourth joint longer than third, ex- cept in the species with blue elytra, where the two joints are equal; thorax as wide at base as elytra, narrowed in front, sides obliquely sinuate, disk convex without transverse basal depression; elytra ob- long or oval, the epi- pleura3 gradually nar- rower from base; front coxal cavities open be- hind ; hind thighs much enlarged, grooved be- neath ; tibiffi more or less bisulcate on outer face, terminated by a moder- Fig. 521. fliion!/cAa,lm«jiihrisjSiy. X 10. (After Forbes.), i ate SpUr; firSt joiut of hind tarsi as long as the next two; claws dilated at base. The males have the last ventral segment truncate, the pygidium vertical and convex; in the females the last ventral is oval and the pygidium horizontal. The species feed upon herbs of various kinds and often do much damage to sugar beets and allied plants. They feign death when disturbed, falling to the ground, where they remain quiet for sev- eral minutes. Of the 18 species ascribed to the genus liy Horn, eleven have been taken in the State. KEY TO INDIANA SPECIES OF DISONYCHA. <i. Form elongate, parallel; elytra .yellow with black stripes, subsulcate on the sides; thorax with an irregular impression each side. 2191. PENNSYLVANIC.\. aa. Form more or less oval; elytra not subsulcate; thorax regularly con- vex. h. Elytra ^'\•ith black and yellow stripes, or yellow with only a narrow sntural and submarginal black Please note that these images are extracted from scanned page images that may have been dig
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbeetles, bookyear1910
