456 



BUREAU OF ANIMAL IKDUSTRY. 



less abundant, leaving a free space between the two grooves, except in the posterior 

 part; eyes near middle of the lateral border. Dorsal surface with fewer hairs, which 

 are scarcely visible. Capitulum straighter. Mandibles 1.5 mm. long; digit 165 

 Hypostome with three rows of 12 to 13 short broad denticles. Palpi a little longer, 

 straighter, slightly convex laterally; third article less triangular on its dorsal surface; 

 hairs less numerous on the internal ventral surface of the first to third articles; a 

 few hairs on the internal dorsal border. Stigmal plates comma-shaped to elongate 

 oval. Coxje relatively a little more elongated; articles of legs a little narrower; tarsi 

 I without spur; pulvillum extends beyond the middle of the hooks. 



Keplete female attains 15 mm. in length by 9 mm. in breadth. 



This tick has been taken from man, cattle, dogs, horses, panther, rabbits, and elan. 

 It is abundant and widely distributed, especially east of the Rocky Mountains. 



The above description, which is almost a verbatim translation of 

 Neumann's work, was apparently based upon a number of preserved 

 specimens. Our experience with live and preserved specimens is that 

 the coloration and spots are exceedingly variable, but that the puncta- 

 tion of the stigmal plates is a reliable and easily recognizable character 

 by which D. electusmsiy be readily distinguished from both D. reticulatus 

 and D. variegatus. It may also be remarked that D. electus is usually 

 smaller than D. reticulatus and D. variegatus. 



It has been very generally supposed that this was the form to which Linnaeus 

 originally gave the name Acarus americanus, and authors have on this account 

 referred to it under the name Dermacentor americanus. As will be seen from discus- 

 sion on page 477, we believe that a confusion has arisen between this and Amblyomma 

 americanum. 



figs. 186-214. [See also Neumann, 1897, p. 366, as syn. of Dermacentor 

 americanus. ] 



1889: ? ''Ixodes bads Riley" of Cook, 1889, pp. 229,230. figs. 81-83. 



1892: ''Dermacentor americanus'' (Linnseus) of Curtice, 1892b, pp. 226, 231, 234. — 

 Idem, 1892c, p. 237.— Railliet, 1893, p. 714, in part.— Osborn, 1896, p. 261, 

 fig. 153.— Marx, 1892, p. 236.— Lugger, 1896, pp. 120-122, figs. 61, 62.— 

 Neumann, 1897, pp. 365-367, 383.— Niles, 1898, pp. 28, 30, pi. iii, figs. 1-5.— 

 Dalrymple, Morgan & Dodson, 1898, p. 241. -Morgan, 1899, pp. 128, 129, 

 133, 134, 135, 141, pis. v-vi.— Ward, 1900a, pp. 200-201, fig. 4.— Idem, 1900b, 

 pp. 436-437, fig. 259. 



1892: "Dermacentor americanum Linn." of Curtice, 1892b, p. 226. 



1894: " Dermacenter americanus'" (Linnaeus) of Francis, 1894, p. 451. 



1869: Ixodes naponensis Packard, 1860, p. 65. [See also Neumann, 1897, p. 366, and 

 Ward, 1900b, p. 436, as syn. of Dermacentor americanus.'] 



1869: Ixodes alhipictus "Pack AUB, 1869, p. 65.— Verrill, 1870, p. 118, figs. 42-44.— Cob- 

 bold, 1879, p. 350.— Holland, 1898, p. 96. [See also Neumann, 1897, p. 366, 

 as syn. of Dermacentor ameridanus. — Ward, 1900b, p. 436. — Moose tick 

 < American Naturalist, 1868, p. 559.] 



1870: " Ixodes albiptctus Packard" of Verrill, 1870, p. 117 (misprint for I. albipictus). 



1899: " Dermocenter americanus Linn." of Lewis, 1899, p. 3. 



