378 



The male is 17 mm. long, this species attains the length of 20 mm.; the female that 

 has lost the left larger cheliped, measures 12,5 mm. In the male the rostrum reaches to the 

 middle, in the female nearly to the end of i^' antennular article. In the female the rostrum 

 appears a little narrower than in the male; at the middle of the corneae the rostrum appears, 

 in the female, a little less broad, but in the male slightly broader than the distance between 

 the concave, lateral margins and the corneae, the female agreeing with that from Ternate, 

 fio-ured by me 1. c. Fig. 60. In the male the small cheliped is placed at the left, in the female 

 at the right side. In the male the carpal segments of the right leg of the second pair are 

 1,1 mm., 1,16 mm., 0,4 mm., 0,42 mm. and 0,7 mm. long, the chela is 1,34 mm. long (palm 

 0,6mm., fingers 0,74mm.). In the female these numbers are: 0,8 mm., 0,9mm., 0,36mm., 

 0,34 mm. and 0,5 mm.; the chela is 1,02 mm. long (palm 0,5 mm., fingers 0,52 mm.). 



General distribution: Red Sea (Heller, de Man); Eritrea (Nobili); Djibouti 

 (Coutiere) ; Mallicolo (Coutiere) ; Mauritius (Richters) ; Mahe (Coutiere) ; Maldives and Laccadives 

 (Coutiere) ; Ternate (de Man) ; Amboina (de Man) ; New Guinea, Beagle Bay (Nobili) ; Samoa 

 (Coutiere). 



732. Alphetis Philodetes de Man. 



J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1909, p. 103. 



Stat. 240. November 22 till December i. Banda-anchorage. Black sand, coral and Lithothamnion- 

 bank in 18 — 36 m. i specimen. 



A new species apparently belonging to the Insignis subgroup for, though the large 

 cheliped is missing, it appears closely related to A. La^iccloti Cout., a species inhabiting 

 the Maldive and Laccadive Archipelagoes. From this species A. Pkiloctetcs, however, at first 

 sight differs by the meri of the 3'''^ and 4'^ legs that are armed with an acute tooth 

 at the distal extremity of their posterior margin. 



Rostrum acute, as long as broad at its base, projecting straightly forward almost to the 

 end of i^' antennular article; upper margin of the rostrum rather sharp, like the interorbital 

 part, which, separated by narrow grooves from the rounded, unarmed, orbital hoods, becomes 

 posteriorly obtuse, gradually widening and reaching to the end of the orbits; as in A. Lanceloti 

 the integument appears, at either side of the rostrum, anteriorly rather thin. Frontal margin 

 straight, transverse as in A. Lanceloti. 



The telson closely resembles that of this species. As it is 1,86 mm. long and the 

 posterior margin 0,64 mm. wide, the telson appears, like in A. Lanceloti, almost 3-times as 

 long as the posterior margin is broad and anteriorly it appears just one and a half as broad 

 as the posterior margin; the form is also quite the same. The anterior pair of spinules, long 

 0,24 mm., of the upper surface are twice as far distant from the posterior margin as from the 

 base and the distance, 0,48 mm., between the two pairs is one-fifth shorter than the distance, 

 0,6 mm., of the anterior pair from the base of the telson; the spinules of the anterior pair are 

 one and a half as far distant from one another as those of the posterior. Of the two spines 

 near the postero-lateral angles the inner ones are as long as in A. Lanceloti, namel)- just 



246 



