. 
. 
_ 
4 
: 
b 
7" 
2.) arg Ses 
tea 
al 3 x 
rae 8 
water? Oe 

1914] Four New Tetranychids 300 
cephalothorax and abdomen) quite similar to that of the red- 
spiders. The male is decidedly smaller than the female, and 
the abdomen is suddenly constricted behind the cephalothorax 
and decidedly more attenuate than is the case with the female. 
The legs of the male are relatively longer, colorless, and the 
hairs and bristles are more conspicuous. 
From Batesburg, South Carolina, on privet (Ligustrum 
amurense), .Rumex acetosella, Oxalis stricta and garden mint 
(Mentha spicata), collected by Mr. F. L. McDonough and the 
writer, and from Baton Rouge, La., on privet and strawberry, 
collected by Prof. E. S. Tucker. At Batesburg this pest has 
been observed frequently to inflict severe damage to privet 
hedges. Several adjacent bushes are often entirely defoliated 
which may result in the death of several yards of hedge. The 
pest attains its greatest abundance and destructiveness during 
the fall months. Several insecticides were thoroughly tested 
during the present (1914) season against this species. Schnarr’s 
Insecticide gave complete mortality, with lime-sulphur pract- 
ically as good. Following are the results of the test. 
SPRAYS MORTALITY 
Selim aiergemnse Chel ClG Cums creas ctiracs ees lee ees cea 100% 
Lime-sulphur (Thomsen Chem. Co.)........:..... 99% 
PerrASS i MAMGIA lads be. Se. forsy ston So ;x,ees.ws)d Sarstae Ses aoe 90% 
molecu lel erie mieten cnr, costes traehie aie ore oes at Sea Less than 5% 
Tetranychus yothersi sp. nov. 
Predominating color a rusty-red, arising mainly from large internal 
structures occurring on each side and connected centrally by a narrow 
isthmus, a shield- or saddle-shaped pale pinkish-amber area includes 
most of the cephalothorax; a narrow clear or translucent area extends 
medially from behind almost to the thoracic suture. Eyes crimson, 
each set at inner border of a groove overlying coxe I and II. Coxe 
and femora of a greenish hue; tibize I and tarsi I salmon-color. Palpi 
salmon-color. Dorsal bristles colorless, not arising from tubercles. 
Body of female sphero-elliptical, widest equatorially: male subcuneate, 
widest across cephalothorax which is somewhat truncate in front, 
abdomen tapering to acute point posteriorly: bristles in four rows, 
averaging in length two-fifths the width of the body. Mandibular 
plate less than twice as long as broad, somewhat tapering anteriorly 
with a distinct emargination. ‘‘Thumb” of palpus much reduced 
longitudinally, bearing at its tip a relatively large, slightly clavate 
“finger” whose base is almost as wide as the tip of the “thumb”’; on 
its upper distal corner are two pseudo-fingers, not greatly thicker than 
hairs, on upper side about midway to base is a ‘small “finger”? and 
