48 IXODOIDEA, OR TICKS, OF THE UNITED STATES, 



Nearly all specimens come from California — Occidental, San 

 Diego, Goose Lake, Siskiyou County, Santa Clara County, Humboldt 

 County ; some taken from deer. 



Closely related to D. venustus, but with a more narrow capitulum, 

 and w^th a broader prolongation to stigmal plate, in the male by 

 shorter hind coxse, and in the female by smaller porose areas. Taken 

 together, I think these characters indicate its distinctness from D. 

 venvstus. 



Neumann first considered D. occideatalis and D. venustus of Marx 

 as identical with the European D. reticulatus. There are, how- 

 ever, many differences, as he later recognized, and D. reticulatus 

 (PL X, fig. 10) does not, as far as now known, occur in our country. 

 When he described D. 0Gcident)alis^ Neumann included with it D. 

 venustus of Marx manuscript. However, I have restricted the name to 

 the form to which Marx applied it. D. occidental/is may perhaps be 

 credited to Curtice, for in a paper " on ticks in general he refers to 

 this species under this name and with a few words of description; 

 hardly, however, sufficient to identify it, and evidently not intended 

 to be a description of a new species. 



Dermacentor nigrolineatus Packard. 



Male. — Rather pale red-brown, no white markings, but the black 

 csecal marks show through in most specimens as several irregular 

 jmes behind; legs more yellow-brown. Capitulum (PL VIII, fig. 

 11) small and narrow, its posterior angles produced into long spines; 

 palpi very small and stout. Dorsum slender, about one and two-thirds 

 times as long as broad; middle anterior region smooth and shining, 

 sides and behind densely punctured, and with many short hairs; 

 lateral furrows not very distinct, twelve impressed lines behind, but 

 the festoons are not as obvious as usual. Legs rather short, coxse 

 with usual spines, coxa IV but little wider at base than long; stigmal 

 plate (PL VIII, fig. 11) large, elliptical, without dorsal prolongation, 

 and covered Avith many large granules. 



Length of male, 3.5 mm. 



Female, — Shield red-brown, without marks; legs similar; abdomen 

 dark red-brown. Capitulum (PL VIII, fig. 9) scarcely twice as broad 

 as long; hind angles distinctly prolonged behind; porose areas large, 

 oval, and distinctly separated ; palpi small and short, not as long as 

 width of capitulum. Shield plainly longer than broad, broadest 

 much before the middle, tapering and almost pointed behind, with 

 very few punctures. Legs small and short, the tarsi very short; 

 coxa3 with the usual spines, that on IV no longer than on III. Stig- 



« About cattle ticks. Journ. Comp. Med. Vet. Archives, January, 1892. 



