A NEW SPECIES OF CORYCAEUS — WILSON 323 



ment with one long stalked seta and a pedicel bearing two short ones. 

 Fifth segment with a long seta distad on each side, that of the 

 outer side accompanied by a much shorter one. Terminal seg- 

 ment with one short lateral, two long subterminal, and two long 

 terminal setae. 



Second antenna (pi. 18, fig. 7) having the basal segment about half 

 the length of the second, its spine about one-fifth longer than the 

 second segment, minutely serrate. The second segment half as wide 

 as long ; with a small lobe at its inside basal margin ; its spine on a 

 short pedicel, also minutely serrate on inner margin ; inflated lamella- 

 like inner portion with a stout, outer spinous process and a more 

 rounded projection inside. Seta like processes of third segment ob- 

 liquely truncated at ends, each bearing a minute hair subterminally ; 

 accessory claw stout, but not reaching to end of segment, three-fifths of 

 the length of the terminal claw, a very small spinous process at its base. 

 Terminal claw only slightly shorter than the spine of second segment, 

 and a little shorter than the third segment. 



Terminal inside spines of exopods of legs 1-3 comparatively 

 straight ; that of leg 1 set at a very slight angle and having two foliate 

 structures between it and the shorter outside spine ; setae shorter than 

 the terminal inside spine. Terminal spine of exopod of second leg 

 (pi. 18, fig. 6) hardly curved, inside margin with long, fine hairs; 

 serrate outer flange not reaching to distal end and not continued across 

 the spine to inner edge ; terminal seta a little longer than the spine. 

 Terminal spine of exopod of third leg very straight, longer than the 

 third segment, proportions of spine to segment about 11:8; inside 

 setae reaching a little beyond the spine. 



Leg 4 (pi. 18, fig. 5) with the exopod approximately as long as the 

 second basipod segment is wide. Top of second basal segment with 

 a small central hump, set marginally with fine hairs ; inside protuber- 

 ance a comparatively large, well-rounded lobe. Segment 1 of exopod 

 very narrow and long, about three-fourths as long as segments 2 and 

 3 combined; proportional lengths of segments, outer edge: approxi- 

 mately 27 : 15 : 20. Spines of segments 1 and 3 long, nearly equal to 

 one another, that of segment 1 reaching at least to the distal end of 

 the second segment. The five inner setae of the third segment all 

 laterally placed, the sixth much broader at the base, in a terminal 

 position, the apex and seta indistinctly demarcated from the rest of 

 the segment (pi. 18, fig. 5, a). (The figures of M. Dahl, 1912, show 

 variation from this usual pattern in a few species of Ditnchocory- 

 caeus.) 



Male (pi. 18, figs. 12, 13) : Total length 0.93 to 1.0 mm., Propor- 

 tions of metasome to urosome approximately 73 : 27. Division of 

 cephalic and first thoracic segments more or less discernible. First 



