30 



PBOCEEDINOS OF THE NATIONAL MUSEUM. vol. xxxvi. 



Fig. 11. — Synali'heus apioceko.s mayaguensis. 

 a, frontal and antennal region ; k, spine 



OF LARGE chela; m', DACTYL OF THIRD PAIR; 

 t. TELSON. 



SYNALPHEUS APIOCEROS MAYAGUENSIS, new subspecies. 



I have examined four specimens from Porto Rico belonging to this 

 form. They are not, however, strictly alike. The most typical 



among them differ from S. 

 ajnoceros in the following 

 particulars : 



Rostrum a little longer 

 than the lateral spines; sty- 

 locerite attaining at least the 

 middle of the median arti- 

 cle of the antennule; scale 

 of the scaphocerite only four 

 times as long as wide; car- 

 pocerite surpassing the an- 

 tennule by 1^ times the 

 length of the distal article, 

 longer than the spine of the 

 scaphocerite, and very swollen at base (only 2.8 to 2.9 times as long 

 as wide) ; the spine of the large chela continues in a straight line the 

 anterior margin of the palm, which presents no swollen tubercle; the 

 dactyl of the third pair is 3.8 times as long as wide and its ventral 

 hook is more feeble than in S. apioceros; the posterior angles of the 

 telson are right angles. 



The other specimens are distinguished from the preceding by 

 slight differences in the width of the antennal scale, in the more slen- 

 der feet of the second and third 

 pairs, and by the more marked pos- 

 terior angles of the telson. It is 

 probable that more abundant mate- 

 rial would permit of separating 

 them also from S. apioceros. 



Type.— Cat. No. 24785, U.S.N.M. 

 Mayaguez, on coral reef. 



SYNALPHEUS APIOCEROS LEIOPES, 

 new subspecies. 



— SYNALPHEUS APIOCEROS LEI- 

 a, FRONTAL AND ANTENNAL RE- 

 K, SPINE OF LARGE CHELA ; iU, 

 PORTION OF THIRD FOOT. 



Some females collected by M. 

 Chaper (Paris Museum) differ ^%es. 

 from S. apioceros in the following gion 

 points : 



The lateral spine of the scaphocerite always slightly exceeds the 

 carpocerite; the feet of the third pair are more slender, the meropo- 

 dites being 4.4 times longer than wide; the telson has its posterior 

 angles right angles. 



Venezuela, precise locality unknown. Type in Paris Museum. 



