NO. 14 MILLIPEDS OF WEST INDIES AND GUIANA LOOMIS 3 



tributed to the more complete subjugation of the land to agriculture 

 and other effects of dense human population. 



A similar situation as regards the humus fauna probably exists in 

 Barbados, the most completely cultivated island in the West Indies, 

 but one not included in the itinerary of the expedition, so that direct 

 observations were impossible. However, the only reason that can be 

 advanced as to why there are but two species of millipeds known 

 from Barbados is that the original species have been greatly localized 

 or nearly exterminated by the intensive cultivation since European 

 occupation. Both of the species reported, Rhinocricus monilicornis 

 and Orthomorpha coarctata, are widely distributed through the West 

 Indies, and it is much more likely that they were introduced into Bar- 

 bados in modern times than that they represent the remnants of the 

 aboriginal milliped fauna of the island, as the native home of neither 

 species is definitely known. 



In the following part of this paper are given descriptions of the new 

 genera and species collected by the expedition ; notes on the struc- 

 ture, distribution, and taxonomy of others previously known ; line 

 drawings of essential structural features of many species ; and magni- 

 fied photographs of some of the most outstanding species, which show 

 to a slight extent the remarkable diversity, not only among the various 

 orders of millipeds involved, but also within the orders themselves.'' 



Class DIPLOPODA 



Subclass PSELAPHOGNATHA 



Order ANCYROTRICHA 



Family POLYXENIDAE 

 POLYXENUS LONGISETIS Pocock 



Polyxenus longisctis Pocock, Journ. Linn. Soc. London, vol. 24, p. 474, 1894. 



Pocock's assignment of this species to the genus Polyxenus appears 

 definitely open to question, as the description is exceedingly short and 

 contains few important details, and none of these relates to peculiari- 

 ties of the genus. There is no indication that eyes are present, but the 

 very long antennae suggest that the species should have been referred 



^With the exceptions of Lophoprocttis comans, photographed in water, and 

 Inodesmus peduncidaris, the milHpeds used in illustrating this paper were lightly 

 coated with ammonium chloride to bring out details of sculpturing in the 

 photographs. 



