1929 ] The Biology of Two Cixiid Plant-Hoppers 291 
Pronotum with small, roughly circular sensoria as fol- 
lows: — a double row (4-4) on disc, bordering median pale 
stripe, a single row on outer side of fore-border, continued 
as a triple row along lateral border ; a sinuate group of six 
near posterior lateral border. Some of the larger sensoria 
have each a very tiny one contiguous. 
Mesonotum with one sensorium anteriorly, on each side of 
median line, a diagonal row of five, graduated in size, out- 
side this, and a number of scattered groups on the tegmen- 
pad. 
Metanotum with one sensorium anteriorly on each side 
of median line, a diagonal row of three outside this ; and one 
sensorium on the hind- wing pad just before it is covered by 
tegmen-pad. (There are none on the hind-wing pad below 
the tegmen.) 
Abdomen in the specimens described long and distended 
preparatory to ecdysis, but normally with part of IV and all 
of VII and VIII segments partially retraced and turned 
more or less upwards as in Mnemosyne. Illrd tergite with 
one sensorium on each side of disc; IV with a row along 
posterior margin, except medially, becoming double lateral- 
ly ; V is similarly supplied, but the posterior edge of VI has 
none, save at the extreme lateral margin where there is a 
small group of 4, close together. The Vlth tergite is rather 
shorter and is followed by the first wax-plate, as in 
Mnemosyne the second and third following the still shorter 
tergites, VII and VIII respectively. VII and VIII bear only 
two or three sensoria, just beneath the extreme lateral 
margin (i. e. occupying a ventral position.) 
Wax-plates of first pair with 5 pores, all situated along 
anterior border and connected with posterior border by 
grooves, wider proportionately than in Mnemosyne and 
dividing each wax-plate into 6 divisions (see fig. 9), roughly 
rectangular except the outermost, which is approximately 
triangular. Second and third pairs of wax-plates similar, 
though restricted in size by the decreasing width of their 
respective segments. 
