468 U.S. NATIONAL MUSEUM BULLETIN 271 



10. Female gnathopod I simple (fig. I68h) Talorchestia (terrestrial) 



Female gnathopod 1 subchelate 11 



11. Article 5 of male gnathopod 2 produced between articles 4 and 6 (fig. 



169a) Najna 



Article 5 of male gnathopod 2 masked between articles 4 and 6 (fig. 168e) . 12 



12. Antenna 1 shorter than peduncle of antenna 2 (fig. 168a), female gnathopod 2 



mitten-shaped (fig. 168/), maxilla 1 usually with palp (even though 



minute), uropod 3 with ramus Orchestia (terrestrial) 



Antennae 1 and 2 subequal in length, female gnathopod 2 normally sub- 

 chelate (fig. 168d), maxilla 1 lacking palp, uropod 3 usually lacking a 

 ramus (fig. 169p) 13 



13. Gnathopods 1 and 2 alike in both sexes, hence male gnathopod 2 not en- 



larged Afrochiltonia (freshwater) 



Gnathopod 2 of male enlarged, unlike that of female 14 



14. Male pleopod 1 normal Austrochiltonia (freshwater) 



Male pleopod 1 with inner ramus attenuated to backturned, whip-like 



lash Chiltonia (freshwater) 



Genera of Talitroidea 



Afrochiltonia K. H. Barnard 



Afrochiltonia K. H. Barnard, 1955. 



Type-species: Chiltonia capensis K. H. Barnard, 1916 (original 

 designation) . 



Maxilla 1 lacking palp; article 4 of maxillipedal palp short, conical; 

 gnathopods of both sexes subchelate, male gnathopod 2 not larger 

 than 1, female gnathopod 2 like gnathopod 1; male pleopod 1 normal 

 {Chiltonia); uropod 3 lacking inner ramus; telson entire. Species: 

 1, S. Africa, freshwater. 



Allorchestes Dana 



Allorchestes Dana, 1849. — Stebbing, 1906. 

 Aspidophoreia Haswell, 1880d. 



Type-species: A. compressa Dana, 1852a (selected by Chevreux 

 and Fage, 1925). See Stebbing, 1899a. 



Maxilla 1 bearing palp; article 4 of maxillipedal palp unguiform; 

 gnathopods of both sexes subchelate, male gnathopod 2 larger than 

 1, article 5 produced between articles 4 and 6, female gnathopod 2 

 like gnathopod 1 ; uropod 3 lacking inner ramus; telson cleft. Species: 

 12, cosmopolitan, littoral. At least two kinds of telson occur in this 

 genus, one like that of Hyale, with subconical lobes fully split from 

 each other and set at an angle to each other forming a tent; and the 

 other a quadratiform fiat plate with partial cleft. Reorganization of 

 this genus needs investigation. 



