360 



BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM 



Distribution. — Messina (Claus) ; Mediterranean (Giesbrecht) ; 

 North Atlantic (Cleve) ; Ked Sea, Indian Ocean (Thompson and 

 Scott) ; Adriatic (Car, Steiier, Pesta). 



Color. — Body rather opaque, with a varying extent of red and 

 yellow pigment, especially around the mouth and in the bases of 

 the appendages; eye red; eggs blue, the color deepening with 

 development. 



Female. — Head indistinctly separated from first segment; third 

 and fourth segments fused, the third lappets broadly acuminate and 



reaching beyond the center of 

 the genital segment; fourth 

 lappets short and exceptionally 

 broad, with acute points; sec- 

 ond segment also with short 

 acute lappets ; genital segment, 

 abdomen, and caudal rami in 

 the proportion of 3 : 1 : 2. Seta 

 on basal segment of second 

 antenna much longer and 

 stouter than the one on the 

 second segment. Total length, 

 1.6-1.65 mm. 



Male. — Body much narrower 

 than in the female; lappets of 

 third segment not reaching 

 center of genital segment; 

 fourth lappets narrower ; genital segment, abdomen, and caudal rami 

 in the proportion of 4:2:3. Genital segment with a broadly 

 rounded lobe on either side of the ventral surface near the posterior 

 end, carrying the greatest width of the segment considerably behind 

 the center. Total length, 1.3-1.4 mm. 



Remarks. — This species has been reported in the Atlantic by Cleve 

 as far north as latitude 45° N. The exceptional width of the lap- 

 pets of the fourth segment is one of the best characters for recogni- 

 tion of the species. 



CORYCAEUS VENUSTUS Dana 

 FlQUEE 219 



Corycaeus venustus Dana, Proc. Amer. Acad. Arts and Sci., vol. 2, p. 39, 1849. — 

 Giesbrecht, Fauna und Flora des Golfes von Neapel, vol. 19, p. 659, pis. 4, 

 51, 1892. 



Occurrence. — Both sexes were taken in a surface tow on Georges 

 Bank, September, 1874. 



Distribution. — Kingsmill Islands (Dana) ; tropical Atlantic 

 (Brady) ; tropical Pacific (Giesbrecht) ; Red Sea, Indian Ocean 



PiGUHB 218. — Corycaeus ovalis: a. Female, dor- 

 sal, (after Giesbrecht) ; b, male, second an- 

 tenna 



