. Brigham Young University science bulletin. Biology -- Periodicals. Biological Series, Vol. 5, N'o. 4, Februarv, 1965 0\ 23. Fig. 31. Dorsal and ventral views, nymphal Derma- centor variabilis. beyond apex of scapulae. Posterodorsal margin of basis essentially straight. Basal spurs sub- acute and distinct. Scutum: Posterior margin distinctly arcuate, extending from one-third to one-half the length of the idiosoma. Cervical grooves elongate and slender. Coxae: External spur on coxa I semi-acute, large. Internal spur small and relatively indis- tinct. External spurs present on coxae II, III, an
. Brigham Young University science bulletin. Biology -- Periodicals. Biological Series, Vol. 5, N'o. 4, Februarv, 1965 0\ 23. Fig. 31. Dorsal and ventral views, nymphal Derma- centor variabilis. beyond apex of scapulae. Posterodorsal margin of basis essentially straight. Basal spurs sub- acute and distinct. Scutum: Posterior margin distinctly arcuate, extending from one-third to one-half the length of the idiosoma. Cervical grooves elongate and slender. Coxae: External spur on coxa I semi-acute, large. Internal spur small and relatively indis- tinct. External spurs present on coxae II, III, and IV, but somewhat indistinct especiallv on coxa IV. Spiracular plate: Sub-circular, with inner margin straight. Goblet cells minute, numerous, and uniform in size. There may be a ring of slightly larger goblet cells surrounding the mac- ula. Fig. 32. Dorsal and ventral views, larval Dermacentor variabilis. Larva (Figure 32) Body: Idiosoma elongate with lateral mar- gins distinctly cur\ed. Length: Maximum, ; minimum, ; mean, Widdi: Maximum, ; minimum, ; mean, Capitulum: Dorsal length greater than width. Palps somewhat slender. Dermal sen- silla absent. Anterolateral margin of basis cap- ituli irregularly curved. Lateral points of basis prominent. Posterodorsal margin of basis straight. Scutum: Per cent mean scutal length Posterior margin slightlv irregular. Cervical grooves shallow, with margins parallel. Scutum extends posteriorlv one-third to one-half the length of the idiosoma. Coxae: Coxa I with a broadly based, dis- tantK- acute internal spur. Sub-marginal, broad external spurs present on coxae II and III may appear as slight elevations or Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Brigham Young University. Provo, Utah : Brigham Young University
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