﻿COPEPODS FROM LAKE ERH HAI, CHINA — HSIAO 



183 



The subspecies M. mridis acutulus was named by Kiefer (1930) for 

 the Sunda Expedition material from Java because the hairs on the 

 inner border of the f ureal rami are not evenly distributed but in groups 

 as in Cy cloys venustus — according to Klie (1928) they are in three 

 groups in G. venustus — and the structure of the spine on the distal 

 joint of the fifth rudimentary leg is large, smooth or with fine spinules, 

 and like that in Cyclops streivwus. Later Kiefer (1934) added some 

 measurements made on two females and stated that the spine on the 

 mesial surface of the distal joint of the fifth leg was very conspicuous, 

 separated from the joint by a suture and armed with featherlike 

 spinules. The specimens from Erh Hai are like this subspecies in 

 that the hairs on the inner surface of the furcal rami are not evenly 

 distributed but in groups of four (fig. 24, d)^ not three. However, 

 the spine of the fifth leg is not separated by a suture from the distal 

 joint which carries it and has no hair or spiny armor. From the 

 measurements Kiefer gave, which are appended at the end of table 8, 

 it will be noted that the length of the inner and outer corner setae on 

 the caudal ends of the furcal rami are similar to the Erh Hai speci- 

 mens and, like them, are much longer than in the Indian or Tibetan 

 material. But on the whole this Megacyclops is not identical with 

 Kiefer's subspecies M. mridis acutulus from Java. As it is also dif- 

 ferent in many quantitative aspects of its characters, a summary of 

 the measurements which are often used for taxonomic purposes are 

 presented in table 4 so that material from China and other parts of 

 the Orient may be compared with this form in the future. 



Table 3. — Measurements of Megacyclops viridis and M. viridis acutulus 



