Acarina 
263 
kk. Dorsolateral prolongation of stigmal plate distinct. 
I . Body of plate distinctly longer than broad; goblet 
cells of medium size, usually 17.5M to 35/x or 40M in 
diameter, appearing as medium sized punctua¬ 
tions on untreated specimens, but on the speci¬ 
mens treated with caustic potash they appear 
very distinct in outline, which is not circular; 
base of capitulum usually less than twice as broad 
as long, the postero-lateral angles always dis¬ 
tinctly prolonged caudad. 
m. Trochanter I with distinct dorso-subterminal 
retrograde sharp, digitate spur; postero¬ 
lateral angles of capitulum pronouncedly 
prolonged caudal, 112/x to 160 m long; goblet 
cells attain 13M to 40 m in diameter; type 
locality California.D. occidentalis 
mm. Trochanter I with dorso-terminal blade; postero¬ 
lateral angles of capitulum with rather short 
prolongations. 
n. Stigmal plate small, goblet cells not exceeding 
45 in the male or 100 in the female; scutum 
with little rust, coxa I with short spurs, the 
inner distinctly shorter than the outer 
. D. parumapertus-marginatus 
nn. Stigmal plate larger; goblet cells over 70 in 
the male and over 100 in the female; coxa I 
with longer spurs, inner slightly shorter 
than the outer; scutum with considerable 
rust.D. venustus* 
II . Goblet cells small, rarely exceeding 17.6 m, occasional¬ 
ly reaching 19M in diameter; on untreated speci¬ 
mens they appear as very fine granulations, and on 
specimens treated with caustic potash they may 
be difficult to see, but their large number can 
be determined from the prominent stems of the 
goblets; surface of outline of the goblets dis¬ 
tinctly circular; base of the capitulum usually less 
than twice as broad as long, the postero-lateral 
angle distinctly prolonged caudad; spurs of 
coxae I long. 
. D. reticulatus and electus (= variabilis?) 
ii. Base of the capitulum (fig. 151) usually hexagonal (except 
in the male of puchellus ); and usually inornate. 
*Dr. C. W. Stiles considers the species which is responsible for spotted fever distinct from the 
venustus of Banks, separating it as follows: 
Goblet cells about 75 in the male or 105 in the female. Texas. D. venustus. 
Goblet cells 157 in the male, or 120 in the female; stigmal plate shaped as shown in the figure 
(figs. 150 a, b). Montana, etc. D. andersoni. 
