NO. 1059. AMERICAX .S /'/:,' f 7 fAS' OF SYXALrilEUtS—COUTlJ'jRE. 



31 



SYNALPHEUS APIOCEROS DESTERROENSIS, new subspecies. 



This form is more distinctly separated from S. apioceros than the 

 preceding; it is also more abundantly represented. The specimens 

 (4 males, 3 females) come from Desterro (Fritz Midler; Paris 

 Museum). 



The rostrum is separated from the lateral spines by wide intervals 

 with sinuous base; the basal article of the antennule is only twice as 

 long as the median article, and the antennule scarcely four times as 

 hmg as wide; the scale of the scaphocerite is from 4.1 to 4.3 times as 

 long as wide, at least equal to the antennule, or longer; the lateral 

 spine of the scaphocerite surpasses it A^ery little, being shorter itself 

 than the carpocerite; the maxilliped exceeds tlie antennule, and 

 slightly the carpocerite; 

 the spine of the large 

 chela continues the an- 

 terior palmar border ; 

 the feet of the third 

 pair are very slender, 

 the meropodite being 

 about 4.7 times as long 

 as wide ; the ])osterior 

 angles of the telson are 

 right angles. 



All these forms, like 

 S. apioceros^ have zoea 

 larvae. None possess 

 large eggs. They them- 

 selves present slight in- 

 dividual variations when 

 the specimens representing them are numerous, and it is prob- 

 able that they will be isolated hereafter as distinct species. I have 

 noticed in one of the specimens of sanjosei the absence of the spine 

 on the anterior border of the carpus. This is an example of a type 

 of " mutation " with which one frequently meets in the Synalpheids, 

 and which is of very slight importance. 



In the Indo-Pacific region the forms with long and slender carpo- 

 cerite, analogous to the preceding, have as the type S. acanthitelsonis 

 Coutiere, which differs from them almost solely by the very spinous 

 angles of the telson, and S. hastilierassus Coutiere, in which the su- 

 perior angle of the basicerite is unarmed, and which consequently is 

 closely allied to the species described hereafter. 



Fig. 13. — Synalpheus apioceros destereoensis. a, 



FRONTAL AND ANTENNAL REGION ; K, SPINE OF LARGE 



chela; K", carpus of large cheliped ; k', small 



CHELIPED OF FIRST PAIR ; m, MEROPODITE OF THIRD 

 PAIR. 



