KONGL. SV. VET. AKADEMIRNS HANDLINGAR. BAND. 21. N:0 5. 



65 



12. VIBILIA GRACILIS, C. BOVALLIUS, 1887. 



PL IX, fig. 14—28. 



Diagn. Caput rostratum, segmentis duobns primis pereii longius. Oculi parvi. Flagellum antennarum 

 primi paris acutum, caput longitudine a-quans. Pedes pereii curti. Femora pedum primi 

 ac secundi parium linearia, angusta. Processus carpi pedum secundi paris metacarpum lon- 

 gitudine fere ajquans. Tibia 1 pedum tertii ac quarti parium non tumidae; dactyli longis- 

 simi. Pedes quinti et sexti parium pedibus tertii ac quarti parium paullo solum longiores. 

 femora lata, linearia; dactyli longi. Segmentum secundum et tertium uri coalita. Anguli 

 postici segment! ultimi leviter producti. Pedunculi pedum uri lineares, ramis longiores. 

 Tehon rotundatum, dimidio peduncidi ultimi paris pedum uri longius. 



. The head is rostrate, longer than the first two pereional segments together. The eyes are 

 small. The flagellum of the first pair of antennas is acute, as long as the head. The 

 pereiopoda are short. The femora of the first and second pairs of pereiopoda are narrow, 

 linear. The carpal process of the second pair is almost as long as the metacarpus. The 

 tibia; of the third and fourth pairs are not tumid: the dactyli are very large. The fifth 

 and sixth pairs are only a little longer than the third and fourth; the femora are broad, 

 linear; the dactyli are long. The second and third ural segments are coalesced. The 

 hinder corners of the last segment are feebly produced. The peduncles of the uropoda 

 are linear, longer than the rami. The telson is rounded, longer than half the j:>eduncle of 

 the last pair of uropoda. 



Colour. Hyaline, with deep red, starlike spots. 



Length. 9 mm. 



Hab. Tropical parts of the Pacific. (S. M.) 



Syn. 1887. Vibilia gracilis, C. BOVALLIUS. "Systematical list of the Arapliipoda Hyperiidea». Bih. t. K. 



Sv. Vet. Ak. Handl. Bel. 11. N:o 16, p. 9. 



Vibilia gracilis and the three following species form a distinct group of Vibiliaj, 

 differing from all the preceding species by the comparatively long nrus, with rounded sides 

 and more or less produced hinder corners. 



The body is slender, compressed. The integument is thin, hyaline, densely provided 

 with starlike spots of a dark red colour. These spots consist of regular crystals of some 

 calcareous matter (PI. IX, fig. 16 — 18). 



The head is a third deeper than long, as long as the first two pereional segments 

 and half the third. The rostrum is as long as a fourth of the head, tolerably acute, feebly 

 bent downwards. Just beyond the base of the first pair of antenna; the anterior sides 

 project into a sharp toothlike process on each side of the head (PI. IX, fig. 15). 



The eyes are comparatively small; they consist each of scarcely more than twenty ocelli. 



The first pair of antenna' (PI. IX, fig. 15) have the basal joint of the peduncle more 

 than twice longer than the two succeeding joints together, the third joint is twice as long 



K. Sv. Vet. Akad. Handl. Band. 21. N:o 5. ° 



