4 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 123 



Pillai (1962) erected a new genus Pseudopetalus to accommodate 

 P. jormicoides and P. caudatus, which he showed to be generically 

 different from other species of Parapetalus, the genus to which they 

 formerly belonged. He also proposed a new genus, Parechetus, to 

 include P. carangis, formerly assigned to the genus Caligodes. Further, 

 in 1963, in considering the genus Abesia, he showed that members of 

 this group possess lunules, thus conforming to the requirements for 

 inclusion in the subfamily Caliginae. Ho (1966) points out Yamaguti's 

 error in erecting a new subfamily for Echetus since the genus does 

 possess frontal lunules and therefore should be assigned to the Cali- 

 ginae. These recent works, plus the new genus described herein, bring 

 the total number of genera in this subfamily to 13. Since Yamaguti's 

 key to the genera of Caliginae includes only 8 genera, his key is now 

 inadequate and a new key is provided below to include the 5 additional 

 genera. 



Key to Genera of Caliginae Females 



1. Sternal furca present 2 



Sternal furca absent 9 



2. Postantennal process (maxillary hook) absent 3 



Postantennal process present 4 



3. Fourth leg exopod 2-segmented, leg 1 with rudimentary endopod. Caligodes 

 Fourth leg exopod 3-segmented, leg 1 endopod absent Parechetus 



4. Leg 4 rudimentary or absent 5 



Leg 4 normal 6 



5. Leg 4 absent Caligopsis 



Leg 4 consisting of small knob with 2 or 3 setae Pseudocaligus 



6. Body form typical caligoid form with no elongations or prominent winglike 



processes Caligus 



Body form elongate or with conspicuous winglike processes 7 



7. Leg 4 exopod 2-segmented Pseudopetalus 



Leg 4 exopod 3-segmented 8 



8. Genital segment produced posteriorly to form 4 digitiform processes. 



Synestius 

 Genital segment and abdomen with prominent lateral expansions. 



Parapetalus 



9. Leg 4 exopod 3-segmented Caritus 



Leg 4 exopod 2-segmented 10 



10. Leg 1 endopod 2-segmented Sciaenophilus 



Leg 1 endopod 1-segmented 11 



11. Leg 3 exopod 2-segmented Alicaligus 



Leg 3 exopod 3-segmented 12 



12. Cephalic region separated from genital segment by long neck . . . Echetus 

 Body of more usual caligoid form, rostral area distinct Abasia 



