71 
3. Tarsus with but one claw, which is only slightly curved and simple, legs rather 
GINO pesseanébenclséanceosendddhsddandsSe ose SE dose b a aaescEeqodusHdausssere 4 
Tarsus with but one claw, which is strongly bent near its middle and beyond 
iat Ce hi sete eee ee eae erie isiciaia Sse <\ac = Soja a ee ees 5 
4. A plate or lamella at inner base of thumb, the thumb with several fine hairs on 
tip (often indistinct), mandibular plate emarginate at tip.-..-.--------- bicolor 
No such plate or lamella, tip of thumb with three fingers ....-.-.------ modestus 
5. But one finger on tip of thumb, and one toward the base on the upper side.... 6 
Rhreerneers om, tMproretie, UAW a-— 2s. - = ase ie eee See eee 7 
6. The finger at tip of thumb is very stout, almost as broad at base as is the thumb 
aiiiae tip spall manor sMOrbee Fee cites osuec te OSes ees ek 2 te. lumidus 
The finger at tip of thumb is much more slender ......-------------- bimaculatus 
7. Seen in side view the lower finger appears the largest, not yellowish, with six 
CIMA IOONS Gad 5 occcnGuseooeob ono co assucaos a Soee SeEae ee onde Sees Sen anode telarius 
Seen in side view the middle finger appears the largest.......-.-....----....- 8 
Svellowish swith six dark spots, om orange: 22-2. 2220S 22S oo! sexmaculatus 
INGISOMM an eG ats et se oteennwe ns Sap ein se ears Slates tat Os Jeeieeiememune = 9 
9. Mandibular plate tapers considerably toward the tip; on desert plants. .desertorum 
Mandibular plate less tapering; on cotton...-.-.....-.----------.-------< glovert 
Tetranychus mytilaspidis Riley. 
Penthalodes mytilaspidis 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 | We sae 
not especially long; the femur of leg I is longer than = @és: claws, 
usual, fully twice the length of the patella; tibia I only a geen 
little longer than patella. The 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 two claws appear to lie in the same plane. 
Color blood red, dark spots each side; legs paler red; bristles pale 
reddish; eggs globular, reddish. 
This species is a true Zetranychus and not a Penthalodes. It is 
closely related to the European 7! pilosus C. & F. Specimens come 
from several parts of Florida on orange and on Limoniuimn trifoliatum, 
also on peach from Marshallville, Ga. Riley states that there are 
three claws, and Berlese figures the European 7. pilosus with the lower 
claw cleft; but on careful observation I can not discern any division to 
the lower claw in the many specimens examined, some of which are 
evidently Riley’s types. Little is known of the habits of this species. 
