KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 7. 



281 



1. EUTHEMISTO LIBELLULA, M. W. MANDT, 1822. 



Pl. XII, fio-. 1—31. 



Euthemisto libellula, GoÉs. 

 Facsimile from Gots. Crust. Aniph., pl. 41, iig. 33. 



Tlie first pair of pernjopoda. 4. Thi 



Fig. 1. The aniinal froin tlie side. 2. The anteniife of a youiig male. 

 second pair. 5. The urus. 



Diagn. Corpus carinatuni. Femiu- pedum percei parium trium ultimorum dilatatum, duplo longius 

 quam latius. Tibia pedum quinti paris post producta, processum formans dimidio stipitis 

 articuli multo longiorem; dact}'lus spinis margini anteriori affixis instructus. Pedes uri 

 primi paris pedes secundi paris longe superantes, pedunculus ramo interno bvevior; 

 ramus externus pedum secundi ac tertii parium ramo interno paullo brevior. Telson segmento 

 ultimo uri paullo brevius, pedunculo pedum uri ultimi paris latius, ac tertiam partem 

 longitudinis pedunculi ejusdem superaus. 



The hody is carinated. Tlie femur of the last three pairs of percaopoda is dilated, being 

 about twice as long as broad. The tibia of the fifth pair is produced at the lower hind 

 corner into a process, which is much more than half as long as the rest of the joint; the 

 dactylus is provided with spine-like teeth on the front margin. The first pair of uropoda 

 reach far beyond the apex of the second pair; the outer ramus of the second and third 

 pairs is only a little shorter than the inner. The telson is a little shorter than the last 



K. Sv. Vet. Akad. Handl. Band. 22. N:o 7. "-•" 



