aa a ie 

1914] Four New Tetranychids 357 
NOTES. ° 
It is of interest to record that, whereas the common red- 
spiders have long been known to feed almost exclusively on the 
under surface of the leaf, this species confines its activities 
entirely to the top of the leaves. 
To date, the species has been recorded upon camphor 
(Camphora officinale) and Eucalyptus sp. at Orlanda, Florida, 
arid upon two varieties of elm, the willow oak (Quercus phellos), 
the white oak (Quercus alba), and the pecan at Batesburg, 
South Carolina. Mr. Yothers states that at cetrain times it is. 
everywhere present on the camphor tree causing a reddening 
of the leaves and a reduced vitality of. the tree. 
The species has been exceedingly abundant the past season 
(1914) on the foliage of the small-leaved elm (Ulmus Ameri- 
cana) to which as early as late June, it imparted a rusty appear- 
ance. Trees thus injured have been observed at Batesburg 
and Columbia, South Carolina, and Laurinburg, North Caro- 
lina. During the seasons of 1911, 1912 and 1913 of the Bates- 
burg investigations no evidence of the occurence of this species 
had been seen. This indicates that the operation of certain 
factors of natural control must have been suspended during or 
just prior to the present season. Another observation of 
interest, is that in spite of the exposure of this species on the 
top of the foliage very little control seems to be exerted through 
rains. 
Tetranychus banksi sp. nov. 
Color rusty-red, from underlying paired organs which occupy all 
of the dorsal region excepting a median abdominal area and a clear area 
containg the mandibular plate. Eyes (in mounted material) trans- 
lucent, directly over suture between coxee I and IJ. The usual series 
of dorsal bristles is lacking, but a series of 18 spatulate-serrate hair-like 
appendages are distributed on the dorsal aspect of the body as follows: 
One at either side of mandibular plate anteriorly, one just mediad of 
each eye, one just overlying each coxa II, six forming a fringe at hind 
margin of body and three along each side of abdomen. Body of female 
rhombic-ovate, widest across cephalothorax, exceedingly obese for the 
size of the legs; cephalothorax rounded generally anteriorly with a slight 
concave border overlying the palpi: male almost sagitate in outline, 
conspicuously reduced in proportion to the legs. Mandibular plate 
about half again as long as wide, tapering somewhat anteriorly, with a 
distinct emargination and with a superimposed chitinized ridge anter- 
iorly. ‘“‘Thumb” of palpus subconical, upper surface twice trans- 
versely depressed with an intervening dilation, bearing at its tip a long 
