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NOTE. 



The special work of the Challenger Expedition was the examination of tlic 

 Physical and Biological conditions of the great Ocean Basins, and the detailed 

 Ofticial Keports on the Scientific Results of the Expedition will— with few 

 exceptions — be limited to those departments of research referring more or less 

 directly to the Ocean. The large collections of Insects, Land Shells, Spiders. 

 Amphibians, Reptiles, and Mammals, made by the Naturalists on land at the 

 various ports and islands touched at throughout the cruise, being regarded as 

 "Incidental Collections," have been deposited in the British Museum, to be 

 examined by the oflicers in charge of the national collections. These 

 "Incidental Collections" will be referred to in tlie Volumes devoted to the 

 Narrative of the cruise, but it is not proposed to publish any detailed Reports 

 concerning them. 



The only Insects having a truly oceanic habitat belong to the genus 

 Hdlohates and one or two allied genera, and consequently this Memoir, by Dr. 

 F. Buchanan White, on those Pelagic Hemiptera, is the only one relating to 

 tlie class Insecta which will appear in the series of Challenger Reports. 



The Memoir was received on the 6th February 1883, and forms Part. XIX. 

 of the Zoological Series of Reports on the Scientific Results of the Expedition. 



John Murray. 



Challenge!'. Office, 

 Edinbuugh, 'lOili July 1883. 



