SEVENTEENTH ANNUAL REPORT. 



451 



side in four,^ then in three longitudinal rows of ten to eleven each; the denticles of 

 each transverse row being equal, diminishing gradually in size proximally, and 

 finally becoming squamiform. Palpi noticeably longer than hypostome, which they 

 overreach in front by about one-half of their third article, almost as broad as long; 

 first article short and annulate; second and third articles larger; convex laterally, 

 decidedly valvate; all three articles provided with strong bristly barbed hairs on 

 their ventro-internal border; postero-dorsal border of the second article prolonged 

 in a blunt retrograde point of variable length, extending over the dorsal surface of 

 the first article; dorsal surface of third article triangular; fourth article small, cylin- 

 drical, infero-terminal. Legs of average length, coxse slightly longer than broad; 

 coxae I decidedly bidentate; coxae II to IV with a rather strong spur on the middle of 

 their posterior edge. Long hairs on all the articles, coxae included, especially on 

 the ventral edge, which is rather festooned by their insertions. A strong recurved, 

 terminal spine on tarsi II-IV, feeble on the pair I; pulvillum attaining nearly the 

 length of the middle of the hooks. 



Fig. 178.— Dorsal view, male Dermacentor variegatus from the wapiti; Blue Mountains, New Hampshire 

 Notice the pseudo-scutum on anterior portion. Greatly magnified. Original. B. A. I. Coll. 3172. 



Replete female. — Body more or less swollen, slightly constricted laterally at the 

 stigmata, may attain 16 mm. long by 10 mm. broad; of a deep brown to slate color; 

 legs almost black (alcohol specimens), brown (live specimens). Scutum, with thin, 

 silvery white metallic rust, with some rose to greenish tinge. Grooves become more 

 effaced as body becomes larger; punctations also nearly disappear; nearly all the 

 hairs are lost. Capitulum, 800 to 900 



^ We have been able to find only three rows of denticles on the American speci- 

 mens of this species. In some cases, however, the teeth on the apophysis of the 

 mandibles assumed a " position which gave the appearance of a fourth row. Both 

 Canestrini (1890, p. 520, Tav. xli, fig. 4d) and Neumann (1897, p. 362) agree that 

 there are four rows anteriorly, then three rows posteriorly. 



