KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 7. 233 



20. HYPERIA THORACICA, n. sp. 



Pl. XI, lig. 37—41. 



Diiign. Caput magniini, dimidio partis coalitae perfei haud longius. Segmenta quinque prima pertei 

 coalita, cetera libera, post acute producta. Carpus jJedimi j)era'i primi paris diiatatus et 

 pauUo productus. Carpus pedum secundi paris productus; margo anterior processus car- 

 palis dimidio marginis posterioris metacarpi paullo longior. Metacarpus pedum primi et 

 secundi parium spinam singulam margini anteriori affixam gerens; margo posterior serratus, 

 dentibus simplicibus; dactylus longus. Pedes tertii ac quarti parium pedibus parium duorum 

 priecedentium paullo longiores; carpus spinam singulam gerens; metacarpus serratus; dac- 

 tylus longus. Pedes parium trium ultimorum duobus pra3cedentibus haud longiores; femur 

 paullo dilatatum; carpus tibia non brevior; metacarpus non serratus; dactylus longus. 

 Segmenta joZez post acute prodvicta; latera segmentorum post angulata. Pedunculuspedit?» 

 iiri ultimi paris quater longius quam latius. Telson lingulatum, longius quam latius, 

 segmento ultimo uri bi-evius, pednnculo pedum uri ultimi paris latius, ac dimidio pedunculi 

 ejusdem paullo brevius. 



The heacl is large, about half as long as the coalesced part of the person, The first five 

 perceonal segments are coalesced, the last two are free, and dorsalh'' produced backwards, each 

 into a sharp point. The carpus of the first pair of perwopoda is dilated, and a little pro- 

 duced. The carpus of the second pair is produced; the front side of the carpal process 

 is somewhat more than half as long as the hind margin of the metacarpus. The meta- 

 carpus of the first and second pairs is provided with a singla bristle on the front margin; 

 the hind margin is serrated, with simple teeth; the dactylus is long. The third and fourth 

 pairs are a little longer than the first and second; the carpus carries a single bristle; the 

 metacarpus is serrated; the dactylus is long. The last three pairs are scarcely longer than 

 the two preceding; the femur is a little dilated; the carpus is not shorter than the tibia; 

 the metacarpus is not serrated; the dactylus is long. The segments of the p)leon are dor- 

 sally produced backwards, each into a sharp point; the lateral parts of the segments are 

 angulated behind. The peduncle of the last pair of uropoda is four times as long as broad. 

 The telson is tongue-shaped, longer than broad, and shorter than the last ural segment; 

 it is broader than, and not half as long as, the peduncle of the last pair of uropoda. 



Colour Light red. 



Length. 4 — 5 mm. 



Hab. The tropical region of the Atlantic: Between Lat, 20°— 13° N. and Long. 43°— 50° W. 

 (D. M.; F. M.; S. M.) 



Hyperia thoracica is distinguished from its congenei's, by the sharp-pointed, dorsal 

 prolongations of the last two perieonal segments, and of all the pleonal, as well as hj the 

 coalition of the first five perajonal segments. 



K. Sv. Vet. Ak. Handl. Band. 22. N:o 7. "" 



