22 6 ' F.NTOMOI.OGISK TIDSKRIir 190I. 



vance of each slit 1 found — in this scarcely adult specimen - — 

 three long, robust hairs, the innermost of them a little nearer to the 

 median line than the end of the split, and just outside and a little 

 ])ehind the lateral end of each slit is inserted a fourth shorter hair; 

 on each of these three segments only these four pairs of ventral 

 hairs were discovered. — The three posterior segments have no 

 seta in the median line: the last segment lias eight seta;. 



Flagellum (fig. 2 g, 2 h and 2 i). It contains thirteen joints 

 and is very slender. 'I'he joints are much constricted at their 

 base and more or less elongate with exception of the two last 

 ones. The first joint, though flattened from pressure, is yet 

 without the basal subjoint twice as long as thick, the eighth more 

 than four times, the penultimate about two and a lialf times lon- 

 ger than thick. The three proximal joints and tlie fiftli and the 

 seventh joints with a subapical whorl of proportionately very 

 short and thin setre: the last joint without a subai)ical whorl, 

 but terminating in a single long seta (only the basal part of tliis 

 seta is drawn in fig. 2 i). 



Sexual characters. As already mentioned the specimen 

 is probably immature and certainly a female. As all the hairs 

 met with in the adult are yet scarcely i)resent and tlic parts in 

 ([uestion damaged by pressure no description will be given, 

 but the reader is referred to the figure (2 f), which exhibits what 

 is observed. 



1-ength. The body measures -9 mm. in length, the flagel- 

 lum 1-24 mm. 



Local i t v. Vina del Mar at Valparaiso (Chile), April 13 

 i(S99 (Dr. F. Silvkstri). 



4- Koenenia angusta n. sp. 

 PI. 3, fig. 3 a — 3 h; ])1. 4, fig. I a- — i f. 



Material. Six adult females, well preserved, with the ex- 

 ception that only a i)art of a tlagellum is ])resent. 



Head. The frontal sense-organ (fig. 3 a) is scarcely twice 

 as long as broad, the rami are robust with almost obtuse end. 

 The lateral groups (fig. 3 b) with three organs, which are four times 

 to four times and a half longer than thick, with acute end. — 'I'he 



34 



