321 
number of stout spines, auxiliary setae, and triangular wax 
pores, the caudal pair the largest and provided each with a very 
long seta. Derm with numerous triangular pores, a few circular 
pores, and setae in rows and patches. 
Type of the genus Tylococcus madagascariensis Newst. 
Only one species referable to this genus is found in Hawaii, 
viz., T. giffardi Ehrhorn. It infests species of Pandanus, but 
without very serious consequences. The species is included 
because Pandanus odoratissimus, which grows wild in Hawaii, 
is the source of the lahala woven fabrics. Several other forms 
are cultivated as ornamental plants. The type species is illus- 
trated by Newstead in the original publication, but the figure 
showing the outline of the body is believed to exaggerate the 
degree of marginal tumescence. 
GENUS RIPERSA SIGN. 
Pseudococcine forms with six-segmented antennae in the adult 
female, without a tooth or denticle on the face of the tarsal 
claw, with marginal cerarii bearing two or more spines, at 
least on the caudal segments, and with anal ring bearing six 
setae. The derm with numerous triangular pores and some 
circular ones. 
Type of the genus Ripersia corynephori Sign. 
This genus has only one accredited species in Hawaii, viz., 
Ripersia palmarum Ehrhorn. It infests a variety of palms, 
including the so-called traveler’s palm (Ravenalla), but without 
very serious consequences. It is mentioned here because it is 
commonly encountered on ornamental palms, where it is difficult 
to extirpate. 
