. Annual report. 1st-12th, 1867-1878. Geology. 740 GEOLOGICAL SURVEY OF THE TERRITORIES. ARACHNID A. Ixodes hovis Riley. (Packard, in First Report Peabody Academy of Science, 18G9, Fig. GO, fully gorged individual, natural size, and an- other empty, enlarged: Fig. G7, mouth-parts much enlarged.) A reddish coriaceous flattened species, contracted just behind the middle; head Fig. 66. Fig. IXODES BOVIS. with the body oblong oval, short and broad, not spined behind, with two deep, round pits; palpi and beak together unusucdly short; palpi long and slender; labium short and broad, densely spi
. Annual report. 1st-12th, 1867-1878. Geology. 740 GEOLOGICAL SURVEY OF THE TERRITORIES. ARACHNID A. Ixodes hovis Riley. (Packard, in First Report Peabody Academy of Science, 18G9, Fig. GO, fully gorged individual, natural size, and an- other empty, enlarged: Fig. G7, mouth-parts much enlarged.) A reddish coriaceous flattened species, contracted just behind the middle; head Fig. 66. Fig. IXODES BOVIS. with the body oblong oval, short and broad, not spined behind, with two deep, round pits; palpi and beak together unusucdly short; palpi long and slender; labium short and broad, densely spined beneath; above, the mandi- bles are smooth, with ter- minal hooks; thoracic shield distinct, one-third longer than Avide, smooth and pol- ished, convex, with the ly- rate mesial convexity very distinct. The whole body is si)arsely covered with mi- nute hairs. Legs long and slender, pale testaceous red; cox;e not spined. Length of body, .15 of an IXODES, MOUTH-PARTS. inch ; width, .09 of an inch. This species, which occurs in great abundance at times on cattle in the West, and Texas and Central America, was also detected by Mr. Merriam on a porcupine, {EretMzon ejjixanthus,) August 10, 1872, at Henry's Lake, Idaho Territory; and on Lepus Bairdii, (No. 47,) col- lected September 15, 1872, at Snake River, Wyoming Territory. Argas Americana^ n. sp. (Fig. 68.) Though our specimens are from Texas, (Belfrage,) yet this interesting Fig. 68. genus, which has not been known before to inhabit America, is associated with Ixodes hovis, having been received in a lot of Ixodes taken from cattle. Body very flat and thin, oval, with the head and mouth-parts concealed by the overreaching dorsal portion of the body, which is bent npward around the margin, though the edge is not revolute. Body above covered with very numerous little round pits, large in the middle and becom- ing smaller on the edge. There are two large, conspicuous oval pits on middle of the anterior third of body ; just in fr
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