40 THE VOYAGE OF H.M.S. CHALLENGER. 



1. Halohates wUllei'storffi, Frauenf. (PL I. fig. 1). 



Halohates u-iillersforffi, Fiaiienfekl, VerbandL tier. k. k. zool. bot. Gesellschaft in Wien, Band 

 xvii. p. 458, Taf. xii. figs. 1, 2, 6, 8, and 10, 1867. 



Oval, widest beliind the middle. Whitish ash grey, paler on the sides and below. 

 Back of the head with two very indistinct reddish spots. First two joints of the antennas 

 (indistinctly), coxae, trochanters, and femora, and in a less degree the tibiae more or less 

 shining steely blue. Second joint of antennae nearly one-fourth shorter than the fourth, 

 an-d about one-fourth longer than the third. Front tarsus with first joint rather shorter 

 than the second. Middle tarsus first joint more than three and a half times the length 

 of the second. 



$ . Length 4"25, breadth 2'3, middle femur 5, hind femur 3"25 mm. 



$ . Length 3 '5, breadth 2 '5, middle femur 4, hind femur 2-5 mm. 



Habitat. — The most mdely diff"used of all the species, but most common in the North 

 Atlantic, between the tropic of Cancer and the equator. Less common in the North 

 Atlantic, north of the tropics ; in the South Atlantic, within the tropics ; in the Indian 

 Ocean ; in the North-West Pacific, at about lat. 10° N., and in the South Pacific at about 

 the tropic. There are no records of its occurrence in the Eastern Pacific. 



In the Atlantic specimens have been taken between about lat. 43° N. and 20° S. In 

 the Pacific between about lat. 10° N. and 25° S. In the Pacific specimens have not been 

 taken east of long. 175° E. 



The following are the localities of the specimens seen by me : — 



Challenger Specimens. 



North Atlantic, localities :— Station 98, Aug. 14, 1873, lat. 9° 21' N., long. 18° 

 28' W.; between Teneriife and St. Thomas, AVest Indies, February and March 1873; 

 about lat. 18° N., long. 28° W., April 28, 1876 ; Station 62, June 18, 1873, lat. 35° 7' 

 N., long. 52° 32' W. 



South Atlantic: — Ofi" Rio de Janeiro, June 18, 1873. 



North Pacific : — North of the Admiralty Islands, March 1875 (about lat. 12° N., long. 

 142° K). 



Specimens from other Sources. 



North Atlantic localities : — Cape Finisterre {Oxford Museum) ; lat. 10° N. {Stockholm 

 Museum); lat. 9° 20' N. — 5° N., long. 26° 30'W.-26° 50' W. {Ucerpool Museum); 

 Sargasso Sea {Liverpool Museum) ; lat. 5° N.,long. 25° W. {Liverp)ool Museum) ; lat. 2° 

 30' N., long. 28' 30' W., January 31, 1865 {Liverpool Museum); Atlantic near equator 

 {Stockholm Museum). 



South Atlantic localities :^Near St. Helena {Berlin Museum) ; South Atlantic {Liver- 

 pool Museum). 



