Chilopoda 15 H 



The Chilopoda collected by the Canadian Arctic 

 Expedition, 1913-18. 



BY RALPH V. CHAMBERLIN. 



The Myriapod material secured by the Canadian Arctic Expedition and sent 

 to me for report was collected in the Cape Nome region at Nome and Teller. 

 Only two species are represented, both being chilopods, one of the order Litho- 

 biomorpha and one of the Geophilomorpha. It is noted that other specimens 

 were taken at Ketchikan in southern Alaska, and preserved dry; but these 

 specimens were not included in the material transmitted for study. 



All types described in this paper are in the Canadian National Collection 

 of Insects, Ottawa. 



Aside -from members of the two orders above mentioned, the Scolopendro- 

 morpha are also represented, at least in the southern part of Alaska, as I have 

 many specimens of Otocryptops rubiginosus Koch from Forrester island, a species 

 occurring also in China and Japan as well as in other northern parts of North 

 America, such as Canada, Minnesota, etc. The common Otocryptops sexspinosus 

 Say also occurs. The chilopods now known to be found in Alaska are as follows : 



Otocryptops rubiginosus Koch. 

 Otocryptops sexspinosus Say. 

 Linotaenia chionophila Wood. 

 Arctogeophilus glacialis Attems. 

 Cryophilus alaskanus, gen. et sp. nov. 

 Gnathomerium melanonotum Wood. 

 Geophilus alaskanus Cook. 

 Pachymerium ferrugineum Koch. 

 Escaryus albus Cook. 

 Monotarsobius tricalcaratus Attems. 

 Ezembius stejnegeri Bollman. 

 Oabius uleorus Chamberlin. 

 Paobius boreus Chamberlin. 

 Ethopolys integer alaskanus, subsp. nov. 



GEOPHILOMORPHA. 



One family, the Chilenophilidse, is represented in the collection. Three 

 other families of the order are also known to occur in Alaska. The Linotaeniidae 

 are represented by Linotaenia chionophila Wood, a species widespread in the 

 northern United States and Canada and exceedingly close to, if not identical 

 with, the well-known European L. acuminata Leach. This species appears to 

 be common on Pribilof, Aleutian, Kadiak, Baranof, Popof and Forrester islands, 

 etc., as well as at points on the mainland. The Schendylidse have also a single 

 known member here, namely, Escaryus albus Cook, which occurs on Pribilof 

 island (St. Paul). The Geophilidse proper are represented by two species, 

 Geophilus alaskanus and Pachymerium ferrugineum (Koch),, the first being known 

 from Sitka and Forrester island, and the second from Yakutat bay and St. Paul 

 island. 



CHILENOPHILIDSE. 



The existence of a group of geophiloid genera differing from typical geophilids 

 in having a strongly developed pleurosternal suture on each side of the second 

 maxillary segment was pointed out by Attems in 1909 1 , this author designating 



J " Zool. u. anthrop. Ergeb. einer Forschungsreise im West. u. Zent. Siidafrika, Myriopoden", 

 in Denks. med.-naturw. Ges. Jena, 1909, 14, p. 22. 



