71 
Tarsus with hut one claw, which is only slightly curved and simple, lege rather 
short 4 
Tarsus with hut one claw, which is strongly hcnt near its middle and beyond 
is four-cleft 5 
1. A plate or lamella at inner base of thumb, the thumb with several line hair- .mi 
tip (often indistinct), mandibular plate emar^inate at tip tricolor 
No such plate or lamella, tip of thumb with three lingers modedut 
5. I>ut one ingef OB tip of thumb, and one toward the base on the upper side <> 
Three lingers on tip of the thumb 7 
»i. The finger at tip of thumb is very stout, almost as broad at base as is the thumb 
al the tip, palpi rather short lumidui 
The finger at tip of thumb is much more slender bmacukUuS 
7. Sees in Bide view the lower finger appears the largest, not yellowish, with six 
dark spots trtarius 
Seen in side view the middle tinker appears the largest S 
S. Yellowish, with six dark spots, on orange sr.nnarulafus 
Not so marked 9 
i>. Mandibular plate tapers considerably toward the tip; on desert plants. .<h s, riorum 
Mandibular plate less tapering; on cotton gloveri 
Tetranychus mytilaspidis Riley. 
Penthalodn WiytiUupidis Riley. — Hubbard, Orange Insects (1885), p. 216. 
Rather larger than most species; body quite broad behind; bristles 
stout, each arising from a prominent tubercle; the subfrontal pair are 
very long, more than twice (nearly three times) longer than frontal 
pair and farther apart; they have the usual arrange- 
ment. The palpi are short and stout, the last joint very 
short, with a short thumb, upon which is a rather clavate 
finger, a smaller finger near base on the upper side, and 
a hair at the upper tip. The mandibular plate is broad, \, 
broadly rounded at tip, scarcely emarginate in the mid- 
dle, with the stylet beneath. Legs rather short, bristles chus~^a^i- 
not especially long: the femur of leg I is longer than ,lis: cUw«, 
usual, fully twice the length of the patella; tibia I only a (^1^^ 
little longer than patella. Tin 4 tarsus terminates in a 
claw which, seen from below, appears simple; seen from the side, 
shows two claws, the principal one but little curved, the other much 
more curved and arising (apparently) from below and near the middle 
of the principal one; these t WO claws appear to lie in the same plane. 
Color blood red. dark spots each side; legs paler red; bristles pah- 
reddish; eggs globular, reddish. 
This species is a true Tetraavytihus and not a Pen&halodes. It is 
closely related to the European T.pUosus C. o<: F. Specimens come 
from several parts of Florida on orange and on Limoniwn trifoluUum^ 
also on peach from Mardiallvillo. (ia. Kih-y states thai there are 
three claws, and Be rlese figures the European T. j>lhtsu.s with the lower 
claw cleft; but on careful observation I can nol discern any di\ igioo t ( > 
the lower claw in the many specimens examined, some of which are 
evidently Riley's types. Little i- known of the habit- of this species. 
