50 Mr. T. D. A. Cockerell on some Meaxican Coccide. 
scattered all over, except where there are black markings. 
These black markings consist of a band passing obliquely 
backwards from each ocular region towards the dorsum, but 
instead of meeting dorsally, these bands bend and form two 
parallel faint dorsal bands. ach oblique band, near its 
origin, sends off a posterior branch, which, running along the 
side of the body, forms one arm of a Y, the other arm and the 
base being the oblique band. In addition to this, a short 
distance behind the middle, three segments are black external 
to the dorsal bands, together forming on each side of the back 
a conspicuous black patch. 
9 (adult). Body about 54 millim. long. General colour 
pale greyish, the dorsal black patches almost obsolete and the 
dorsal bands or lines becoming interrupted; the black ¥ alone 
remaining distinct. Caudal and lateral filaments or hairs 
without white secretion, caudal ones about (or hardly) half as 
long as body. 
The adult is thus less conspicuously marked than those 
about two-thirds grown. The young, however, have the 
black marks nearly or quite obsolete, the white secretion 
tends to form interrupted dorsal and lateral keels, and the 
caudal and lateral filaments are broadly covered with fine 
white secretion, the caudal appearing rather longer than the 
lateral. One can only distinguish five to eight secretion- 
covered processes on each side, each representing more than 
one hair. 
¢ sac (puparium) white, ordinary. 
3S (adult). Body about 24 millim. long. Caudal filaments 
5 millim. long. Wings 33 millim., grey, slightly ochreous 
at base, veins darkened. Head, body, and legs grey, but 
dorsum of abdomen white with secretion. Filaments diver- 
ging, curving near their ends, conspicuously white. 
All the above characters can be observed with a hand-lens. 
A microscopical examination revealed the following addi- 
tional features :— 
@ (adult). Legs and antenne brown. Antenne eight- 
jointed, third the longest; 4 longer than 2, 6 and 7 about 
equal; 4 a little shorter than 4, but a little longer than 6; 8 
a little longer than 4; 1 about as long as 2. Antennal 
formula therefore 3884 (215) (67). 
Tibia longer than femur, tarsus less than half as long as 
tibia. Claw large. 
Larva with seven-jointed antenne, 7 longest, then 3. 
Tibia about one fourth longer than tarsus. 
Eggs oval. 
‘This species is somewhat allied to D. vérgatus, Ckll., but 
