434 NOTES. 



true spiders in fissures in blocks of coral which were under water at 

 every high tide ; they were very common in Bohol and at Zamboanga 

 in the Philippines, but as yet remain undescribed, for my collection of 

 Arachnida is in the Hamburg .Museum, and has not been worked 

 upon. 



3. Innrcta. — Darwin, in his well-known NahiraluVs Voyage, alludes 

 in many places to marine insects, principally beetles and bugs. Many 

 insects have lately been discovered on the coast of North America by 

 Baird [Rep. on the Condition of tlic Sea-fisheries of the South Coast vf New 

 England, 1871-2, p. 1) and Packard {Proe. Essex Inst. vol. vii.p.44, and 

 Silliman^s Journal, 1874, p. 131). These are beetles, bugs, and flies. I 

 found a few marine insects in the Philippine seas, but they unfor- 

 tunately remain undescribed. . Of older observations I may mention 

 Slabber's dipterous larva, probably the larva of a species of Chironomus ; 

 and I found an abundance of a very similar species in the Philippine 

 seas, where swarms of ilies sometimes cover the surface in still bays ; 

 then Audouin, who observes that BUmiis fnhesccns surrounds itself, 

 like the fresh-water Argyroneta, with a bubble of air. Among the 

 Hemiptera — Salda, Corixa, Hygrotreehvs, and Halohatcs — the species of 

 Haloiates are most conspicuous, for they are found in every stage of 

 development running about on the surface of the sea, often hundreds 

 of miles from land . Eight species of the genus, as I am informed by 

 my friend Dr. Hagen, have been described ; that described in the text 

 and discovered by me is a new species and the largest of all. They are 

 found in the Atlantic, Indian, and PaciSc Oceans, as well as in the 

 Chinese Sea, but only in tropical or subtropical regions. 



Insects are also found in salt-water lakes inland. Packard found 

 eight difEerent species in Clear Lake (Silliman's Journal, 1871) and one in 

 Lake Mono. Numerous insects exist in the brine lakes of Europe, but 

 no collection or complete description of them is known to me. I experi- 

 mented this 3'ear on some larva? of flies which I found in a basin in the 

 courtyard of the Wiirzburg University ; they lived in sea- water very 

 happily for five or six days, but then perished. I suspect, however — and 

 shall test it more accurately next year — that they died for want of food. 

 Compare with this Plateau's experiment ; see below. 



Mollvsea. — Cyclas, t«)«, and Anodonta live in the Livonian Gulf 

 associated with Tellina and Ycnvs. In the Baltic we tind Lymncra 

 auriciila/ria and ocata, and Nei itina fliiviatilis with marine moUusca. 



Paludina and A'critina are found in the Caspian with Mytilus and 

 Cardhim, according to Eichwald. 



Planm-Ms glaher (Jeffreys) is found in 1,41.5 fa hems north of Cape 

 Tenez, Algiers. 



TJnio sp., within reach of the salt-water flow in Brisbane river • 

 (^Voy. of Rattle sn ah c, vol. ii. p. 362). Baer found Unio at the mouth of 

 the Dwina. 



