36 Psyche [March 
approximately 15 mm. long. One of its gonopods is shown 
in figure b of the plate. 
Amphelictogon rex sp. nov. 
In the Museum of Comparative Zoology collection are 
three males, including the type, collected in the Sierra de 
Nipe, Cayo del Rey, Oriente Province, Cuba, April 1940, by 
J. P. Carabia. 
Diagnosis: This species belongs in the series with color 
differences between the poriferous and non-poriferous seg- 
ments. Its closest relatives appear to be A. obscurus 
Chamberlin and A. bidens Loomis but with obvious differ- 
ences from them in coloration and modifications of the 
gonopods. 
Description: Length 30 mm.; width 4.5 mm. across pos- 
terior margins of segments 1 and 2 ; 4 mm. across the middle 
of the body which is parallel-sided to about segment 15, after 
which it narrows to the last segment. 
In alcohol the head is dark brown except for the narrow 
white anterior margin; antennae with basal joints light 
colored, the outer joints dark brown; legs and ventral 
surface of all segments white ; segments 1 to 4 dark 
brownish-black except the pure white posterior corners; 
poriferous segments from the fifth to the penultimate have 
the prozonites brown with a large white spot in front of the 
keels, reaching nearly to the middle of the dorsum ; meta- 
zonites with the keels and sides of the dorsum white, only 
the median line dark brown ; non-poriferous segments have 
the sides and dorsum of the prozonites dark brown meta- 
zonites dark brown, except the outer two-thirds of the keels, 
which are white ; last segment brown at base, white at apex. 
Surface of segments shining, the keels with two or three 
small granules, each with a tiny pit at middle from which a 
seta may once have projected; segments 2 to 8 with a 
tooth at the anterior corner of each keel ; posterior margin 
of most keels from segment 5 to segment 16 with two teeth, 
the outer of which is largest; margins of poriferous keels 
raised above the inner surface of the keel, the elevation most 
evident at the rounded anterior corner ; pore callus elongate, 
formed by the gradual thickening of the margin, the pore 
opening obliquely outward and upward. 
