370 r\c.K sKo(!siii;i!r. 



nirtlo first antenna. Tlu' iiri<iinal sfvcntli and ciiiiitli joints arc .stnuijrly, |>rfsiiiiial)l\- complcicly 

 imniovoahly, unitcil t<i oarh otlu'r; the (uiiiiiial boundary between them can, liowever, be clearly 

 observed. Tlie proportions between tiie joints seem lo be subject nnlv \i> sliuhl variation; 

 the conditions in llie I'orms invest iijiated l)y me wcic about as follows {llie liiiurcs arc lakcii 

 from mea.surements of I'h. ( J'h.) <j((iliosa): 



l\U n':: III ;!: IV ^ V;;; VI |. 



With rc<;ard to the etjuipmcnt of bristles on this antenna a rather slight amount of 

 variation was observed in the species dealt with in this treatise. On account of tlie uncertjiinty 

 of the statements in the literature attention is paid below only to the conditions in these species 

 that I have verified myself. The second joint has three bristles, all situated near the distal 

 boundary of the joint, one anteriorly, one posteriorly and one laterally. The thiid joint has 

 one bristle distally-posteriorly and a somewhat varying number (from two to four weie obseived) 

 situated in most cases distally-antcriorly. The fourth joint has four bristles distally-posteriorly 

 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 family. All the liristles mentioned so 

 far, like that on the original sixth joint, are of about the same type: They are of the ordinary 

 t}'pe, 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 may 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 anrl 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 Ci/pridininae. 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 

 the same type as the two posterior ones on the original seventh joint; on the anterioi- one of 



