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TAO B SKOOsr.KliO
370
male first antenna. The original seventh and eighth joints are strongly, presumably completely
immoveably, united to each other; the original boundary between them can, however, be clearly
observed. The proportions between the joints seem to be subject onlv to slight variation;
the conditions in the forms investigated by me were about as follows (the figures are taken
from measurements of Ph. (Ph.) globosa) :
lä ITT
114 • 11
x i29 y
IV , ; V VI f.
With regard to the equipment of bristles on this antenna a rather slight amount of
variation was observed in the species dealt with in this treatise. On account of the uncertainty
of the statements in the literature attention is paid below only to the conditions in these species
that I have verified inyself. The second joint has three bristles, all situated near the distal
boundary of the joint, one anteriorly, one posteriorly and one laterally. The third joint has
one bristle distally-posteriorly and a somewhat varving number (from two to four were observed)
situated in most cases distally-anteriorly. The fourth joint has four bristles distally-posteriorlv
and one or two bristles distally-anteriorly. The original fifth joint is quite without the sensory
bristle that is characteristic of most other genera of this familv. All the bristles mentioned so
far, like that on the original sixth joint, are of about the same type: They are of the ordinarv
type, with short hairs distally and furnished in most cases with one or more wreaths of long,
stiff secondary bristles near the middle; in some cases, often not quite constantly, the long
secondary bristles mav be missing on one or two of these bristles; the length of these bristles is
somewhat different in different species. On the end joint eight bristles are to be observed, thus one
more than on the seventh and eighth joints in the sub-family Cypridininae. Four of these bristles
are situated on the original seventh joint, four on the original eighth joint. The bristles on the
former of these two joints are situated as follows: one is situated anteriorly, one medially and
somewhat anteriorly, two posteriorly. The anterior one of these bristles is of the same type
as the bristles on the preceding joints. The medial one is a typical sensory bristle; it is about
as long as the anterior sides of the second and third joints; it is powerfully annulated proximally,
the annulation becomes weaker distally and may even almost disappear; on its anterior side
this bristle has a few very fine sensorial filaments, of equal thickness throughout, hyaline or
only weakly and finely annulated and bare; distally these sensorial filaments are somewhat
rounded and provided with a short, fine (sensory?) hair; one or two of these filaments were
observed near the middle of the bristle and three close together near its distal point. The two
posterior bristles of the original seventh joint are of about the same type as the last-mentioned
bristle, but differ from it by having a somewhat larger number of anterior sensorial filaments:
five to seven proximal ones and four distal ones were observed. The four bristles of the original
eighth joint have the same positions as in the sub-family Cypridininae. All four are subequal
or differ only very slightly in length; they are about as long as the two posterior bristles of the
original seventh joint. The two that are situated close to each other laterally are simple, rather
narrow, of about equal thickness throughout, bare, rather finely annulated sensorial filaments
as in the sub-family just mentioned. The two bristles that are situated more medially are of
tlic sanie type as the two posterior ones on the original seventh joint; on the anterior one of
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