OF WASHINGTON. 305 



Ventral pores arranged in two circular areas : Genus Schendylops, type 

 ,S. grandidieri,* Madagascar. 



Ventral pores arranged in a single, median, circular area 



Claw of maxillary palpus simple; mandibles with a single dentate 

 lamella; last joint of anal legs much smaller than the preceding: Genus 

 Schendyla, type S. nemorensis, Europe and North America. 



Claw of maxillary palpus pectinate; mandibles with three dentate 

 lamellae; last joint of anal legs as long or longer than the preceding. , 



Labial and maxillary sterna distinct ; labrum free except in the mid 

 dle; anal legs slender in both sexes: Genus Ctenophilus, type C. afri- 

 canus, Liberia. 



Labial and maxilla sterna coalesced in the middle; labrum entirely co 

 alesced; anal legs crassate, especially in the male: Genus Pectiniunguis, 

 type P. americanus, Lower California and Florida Keys. 



PECTINIUNGUIS AMERICANUS BOLLMAN. 

 (Plate IV, fig. 3). 



This most common myriapod of the Keys was, until the 

 present time, known only from a single male specimen secured 

 by the Albatross in the Gulf of California, an indication of its 

 littoral habits. On the Keys it was frequently taken under 

 stranded rubbish of any sort which held moisture and gave suffi 

 cient protection. Specimens were more numerous on rocky than 

 on sandy shores, and were sometimes apparently absent from the 

 latter. On Sugar Loaf Key many specimens were secured. 



The living animals are a uniform waxy brown in color, or may 

 have two dark longitudinal bands like Geophilus rubens Say 

 ( G. cephalicus Wood). On being disturbed they exhibit all the 

 agility of their order in attempting to escape. No specimens of 

 this species were found in hammocks or cultivated grounds ; it is 

 apparently confined to its littoral habitat, and it is easy to under 

 stand how it might become widely distributed on floating rubbish 

 or driftwood. Its discovery in the West Indies and along the 

 entire Gulf coast is, accordingly, to be expected. 



Regarding the previously unknown female, it should be stated 

 that the anal legs are slender, particularly the two distal joints. 

 The legs are, however, pubescent, with short hairs, as in the 

 male. The genital palpi seem to be rudimentary. 



* Grandidier's Histoire, 1897, XXVII, pi. XII, figs. 8-Sff. This genus is 

 not to be confused with Schendyloides Attems, described as a subgenus 

 of Schendyla, with which it is not related, since the mandibles are without 

 dentate lamella;, and the labium is tripartite, all three divisions having 

 long teeth. Schendyloides is accordingly a member of the Geophilidae in 

 the strict sense. 



