AETHEOPOD FAUNA OF THE WEST INDIES. 467 



two depressions which cause the middle line to appear lightly 

 carinate. 



The sternites marked with a median sulcus, and with a second 

 sulcus on each side close to the lateral margin; the normal 

 median transverse sulcus indistinct. 



Anal somite : tergite with elevated margins, lightly depressed 

 posteriorly; 'pleurce porous, produced into a long, pointed, smooth 

 process, which extends just beyond the level of the apex of the 

 first spine of the femur ; sternite elongate, narrowed posteriorly, 

 lightly emarginate behind. Legs long and very hairy ; the femur 

 armed beneath with a series of four strong spines, also studded 

 with spiniform hairs ; the patella a little shorter and slenderer 

 than the femur, armed internally in its proximal half with two 

 smaller spines ; the tibia as long as the patella, but slenderer, 

 unarmed, these three segments notched above at their distal 

 ends but not spined ; the tarso-metatarsus almost as long as the 

 rest of the leg, composed of eleven distinct longish cylindrical 

 segments, these segments excepting the first one are subequal 

 in length but the distal ones are narrower ; the first segment 

 is about half the length of the tibia, and as long as the two that 

 succeed it. 



Legs long, slender, and hairy, the 22nd pair extending almost 

 to the posterior end of the patella of the anal leg. 



Length 15 mm. ; of anal leg 5"8 mm. 



Locality. St. Vincent {S. H. Smitli). 



The example of this species that has been described above 

 agrees closely with Newport's diagnosis of JST. longitarsis. The 

 type, however, was a very much larger specimen, for Newport 

 gives If inches (44 mm.) as its total length. 



Of the species of this genus established since Newport 

 characterized N. longitarsis, the one that comes nearest to it is 

 N. monticola, Pocock, from Chimborazo. The two are alike in 

 the form of the sulcus on the first tergite, and of the anterior 

 border of the coxse of the maxillipedes, so also in the spine 

 armature of the anal legs ; but N. monticola may be readily recog- 

 nized by the much greater length of the proximal segment of 

 the tarso-metatarsus, which is almost as long as the tibia, and in 

 the shortness of the tarsus and the fewness of its segments. 

 Both the species differ from iV. dentata in the shape of the 

 sulcus of the first tergite, which is angular in the last named. 

 N. dentata also has the maxillary coxae produced forwards 

 anteriorly. 



