Myriopoda from the Andes of Ecuador. 145 



the opposite side in a depression lying immediately behind 

 the angle of the anterior furrow. 



The median sulcus on the sternites is much less conspicuous 

 and the anal sternite has the posterior margin more concave. 

 In the anal legs the femur is more cylindrical and the inferior 

 spines are not so large; the patella is armed on its inner surface 

 with two stronger spinules. The femur, patella, and tibia are 

 about equal in length, but the tarsus is much shorter than 

 the tibia ; the metatarsus is the longest segment of the legs 

 and is composed of six or seven clearly defined segments. 

 In the preanal legs there is a distinct metatarsal segment. 



Length 18 millim. 



Chimborazo (east side, 12,000 feet). 



Specimens of this genus are very rare in collections, and 

 there is consequently not much known of the specific charac- 

 ters of the group. I am inclined to think that in this case 

 the only features to be relied upon for the separation of these 

 two forms are those found in the sliape of the sulci of the first 

 tergite and of the anterior margin of the maxillary sternite. 

 Those found in the anal legs are, I suspect, subject to indi- 

 vidual or perhaps sexual variation. 



This species differs from azteca and lonyitarsis in having 

 the anterior border of the maxillary sternite produced for- 

 wards. It appears somewhat to resemble the former in the 

 shape of the sulci on the first tergite. 



A second specimen obtained by Mr. Whymper on La 

 Dormida, at an altitude of 11,800 feet, differs from the type in 

 having ten metatarsal segments on the anal legs. In this 

 particular it approximates to N. hngitarsis^ but until the form 

 of the sulci of the first tergite in this species is known it is 

 impossible to refer any species to it with confidence. 



DIPLOPODA. 



Btenonia rufipes (C. Koch). 

 Platyrhacus rufipes, C. Koch, Die Myr. i. p. 96, pi. xliv. %. 86. 



A single specimen at Nanegal (3000-1000 feet). 



C. Koch's specimen was described as doubtfully coming 

 from Brazil. This example from Ecuador agrees very closely 

 with C. Koch's figure of rufijjeSj except that the tergites are 

 slightly smoother and the posterior series of granules smaller j 

 the margins of the keels are in nearly every case quadriden- 

 tate ; the posterior tooth, however, is sometunes bifid. 



