80 



BIOLOGICAL RESULTS OF LAST CRUISE OF CARNEGIE 



stations at which this species was taken show an ex- 

 treme range from latitudes 34° 06' north to 31° 28' 

 south. A copy of the record of its capture is as follows: 



Halobates micans Eschscholtz 



Figure 1 (B) 



=H. wullerstorffi Frauenfeld 1867 



Body not parallel sided, widest just behind the mid- 

 dle of the mesonotum. Color grayish-blue with metallic 

 reflection above, ash-gray below; at least the basal seg- 

 ment of the antennae, the anterior femora and often the 

 femora of other legs, and the genital segment of the 

 male, steel blue. Antennae just over one-half as long as 

 the body; first segment over twice as long as second and 

 plainly longer than second and third united; third seg- 

 ment but slightly shorter than second and much shorter 

 than fourth. Anterior femora about one-seventh longer 

 than tibia, the latter a little longer than tarsus; basal 

 segment of tarsus about one -fourth to one -fifth shorter 

 than terminal one; anterior femur, seen from the side, 

 about one-fourth to one-fifth as wide as long. Interme- 

 diate legs with the femur not twice as long as tibia, the 

 latter subequal to length of tarsus; basal segment of the 

 tarsus about three and a half to four times as long as 



terminal one. Posterior legs with the femur about one- 

 third longer than tibia; the latter three to four times as 

 long as the tarsus. Length 3.5 to 4.5 mm, diameter 2.3 

 to 2.5 mm. 



This widely distributed species occurs in the warm- 

 er parts of both the Atlantic and Pacific oceans. A cast 

 skin was obtained in the Caribbean Sea at latitude 15° 18' 

 north, longitude 68° 11' west; a nymph was taken near 

 the Galapagos Islands at latitude 03° 15' south, longitude 

 99° 48' west; another adult just a little north of the Fiji 

 Islands at latitude 14° 41' south, longitude 167° 41' west. 

 A little north of the Sicily Islands three nymphs were 

 taken which apparently belong to this species- -two at 

 latitude 01° 48' south, longitude 152° 22' west, and one 

 at latitude 04° 51' north, longitude 146° 46' west. 



Halobates splendens Witlaczil 

 Figure 1(C) 



Body not parallel sided, widest across middle of the 

 mesonotum. Color above blackish-blue, beneath ash- 

 gray; antennae, legs, and terminal male genital segment 

 steel blue. First segment of antennae nearly as long as 

 the other three segments united and at least three times 

 as long as second segment; third segment slightly short- 

 er than second and nearly one-half as long as the fourth. 

 Anterior femora scarcely longer than the tibia, the lat- 

 ter about one-fourth longer than tarsus; basal segment 

 of tarsus subequal to terminal one or a little shorter; 

 anterior femur, seen from the side, one-fourth as wide 

 as long. Intermediate legs with the femur not twice as 

 long as tibia (13:7.5); the latter subequal to length of 

 tarsus; basal segment of the tarsus about five and one- 

 half to six times the length of the terminal one. Poste- 

 rior legs with the femur only one-eighth longer than 

 the tibia; the latter almost three times as long as tar- 

 sus. Length 4.66 to 5.33 mm, diameter 2.5 mm. 



This species is closely related to micans Esch.with 

 the same steel-blue appendages but the different rela- 

 tive lengths of the tarsal segments will differentiate it. 

 Witlaczil described this from the west coast of America 

 between the equator and the Tropic of Capricorn. The 

 Carnegie plankton collection contains an adult and ten 

 nymphs collected in the same region--latitude 09° 58' 

 south and longitude 82° 10' west. 



