160 U.S. NATIONAL MUSEUM BULLETIN 260 



female of A. torpens, J. L, Barnard has already made tlie point that 

 his A. torpens may be identical with A. crassipes K. H. Barnard. 

 Distribution, — Middle Baja California, 842-1720 m. 



Austrosyrrhoe rinconis, new species 



Figure 79 



Diagnosis. — Rostrum moderately short, very stout, not downturned, 

 slightly curved; lateral cephalic lobes not as strongly flattened as in 

 other known species of the genus ; antennae short, equal in length, arti- 

 cle 2 of antenna 1 simple, equal to article 1 in length, article 1 with 

 recurved distal tooth, article 3 shorter than 2, accessory flagellum 

 biarticulate, article 2 minute; coxa 3 with strongly pointed and pro- 

 duced anteroventral corner, posterior edge poorly excavate, lacking 

 distinct posteroventral lobe, coxa 4 large for genus, slightly expanded 

 distally, posterior margin sharply excavate; gnathopod 1 of medium 

 thickness, article 6 relatively slender, article 5 of gnathopod 2 not 

 strongly elongated ; palms of gnathopods 1 and 2 defined by two stout, 

 serrate spines ; article 6 of pereopods 1 and 2 slender, linear, sparsely 

 setose; article 2 of pereopod 5 relatively slender in comparison to 

 other species of genus; pleonites 1, 2, 3, and 5 each with small, sharp, 

 straight dorsal tooth ; pleonal epimera 2 and 3 each with posteroven- 

 tral tooth of medium size, that of 2 sharper, epimeron 1 large, extend- 

 ing ventrally as subtriangular, distally subacute process lacking small 

 tooth; rami of uropod 3 interequal in length, outer ramus probably 

 biarticulate; uropodal peduncular processes when present, small; tel- 

 son short, not reaching halfway along rami of uropod 3, cleft 40 

 percent of its length. 



Remarks. — Mouthparts agreeing generally with those of Av.sfro- 

 syrrhoe ilergetes J. L. Barnard (1964b) but mandibular palp very 

 slightly longer, inner plate of maxilliped with more distinctly cuspi- 

 date mediodistal corner; left mandible lacking but right mandible 

 bearing one small marginal spine on molar, both mandibles bearing 

 lacinia mobilis, bifid on right mandible; outer plates of maxilla 1 with 

 9 and 10 spines respectively; lower lip broken during dissection and 

 not analyzed. 



HoLOTYPE. — AHF No. 6110, female, 3.0 mm. Unique. 



Type-locality.— Station 7358, 27°35'45" N, 115°08'30" W, 1095- 

 1205 m, Apr. 21, 1961. 



Relationship. — By virtue of its pereopods 1 and 2, head, coxae, 

 uropods, telsonic length, and pleonal epimera this species is most 

 closely related to A. septentrionalis Stephensen (1931) and might be 

 a subspecies or even a developmental stage of that species. Numerous 



