002 



Cerapodina. Sp. Bate justly pointed out that these 2 genera ought to be 

 combined, but erroneously united them with the genus Cerapus of Say, and was 

 followed in this view by Boeck. As shown by S. Smith, the last-named genus 

 is, however, very different from Ericlttlwnius of M.-Edw., which must therefore 

 be restored, to include the species referred by Sp. Bate and Boeck to the former 

 genus. Dana referred the females and males to 2 different genera, the for- 

 mer to the genus Dercothoe, the latter to the genus Pyctilus, and Sp. Bate 

 adopted the former genus, though he had some suspicion of its validity. The 

 genus differs rather considerably from the other Podocerida, and should perhaps 

 more properly be included in the next family, Corophiidae, exhibiting, as it 

 does, several points of agreement with the genus Cerapus Say, belonging to 

 that family. The peculiar structure of the posterior gnathopoda in the male 

 is a very easily recognizable characteristic, whereby this genus differs con- 

 spicuously from the other Podoceridse, and the structure of the last pair of 

 uropoda and that of the telson is also rather peculiar. The genus comprises 

 several species both from the northern and southern hemispheres. To the 

 fauna of Norway belong 3 species, to be described below. 



12. Erichthonius abditus, (Templeton). 



(PI. 215). 

 Cerapus abditus, Templeton. Trans. Ent. Soc. I, p. 188, PI. XX, fig. 5. 



Syn.: Cerapodina abdita, M.-Edw. 



Dercothoe punctata, Sp. Bate 9. 



Body moderately slender, with broadly vaulted back. Cephalon having 

 the lateral lobes rather broad and produced in front to a small dentiform 

 projection. Second pair of coxal plates somewhat larger than the 2 succeed- 

 ing ones, and irregularly oval in form ; 5th pair about same size as the 2nd, 

 and having the anterior iobe rather deep and rounded. Last pair of epimeral 

 plates of metasorae smaller than the preceding pair, and narrowly rounded at 

 the lateral corners. Eyes comparatively large, and somewhat protuberant, 

 rounded in form, with bright red pigment. Superior antennae considerably 

 exceeding half the length of the body, 2nd joint of the peduncle the longest, 

 3rd joint longer than the 1st, flagellum nearly as long as the peduncle, and 

 "inpnsed of about 12 articulations. Inferior antenna? of same length as the 

 superior, and having the flagellum of about same length as the last 2 pedun- 



