﻿166 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loo 



Types. — The type series consists of the female holotype, male allo- 

 type, and six male and female paratypes, U.S.N.M. Nos. 84546, 84545, 

 and 84547, respectively. 



Discussion. — Kiefer (1932a) reconsidered the assemblage of species 

 formerly placed in Diaptomus and, adopting G. O. Sars's (1903) family 

 Diaptomidae split it into two subfamilies, Paradiaptominae and Diap- 

 tominae. The old genus Diaptomus in the second subfamily was first 

 split by Kiefer into a number of subgenera, and in 1932 (Kiefer, 1932b) 

 he raised them to genera. TropodiaptOTnus as a new genus was estab- 

 lished in his 1932a monograph, with T. orientalis (Brady-Sars) as type 

 species. T. hehereri was first described by Kiefer (1929a) from Java 

 and again in 1934 from Sumatra and Java. His two descriptions are 

 not quite the same, the later work being more detailed, though the two 

 lots of Java specimens were collected from the same locality (Dieng 

 Plateau) two years apart. 



In comparing Kiefer's descriptions with the material from Lake 

 Erh Hai it is observed that the female specimens from Java, Java and 

 Sumatra, and Yunnan have similar thoracic structure, except that the 

 end of the thoracic segment is asymmetrical, with the left side larger 

 and less sinuous than the right in Kiefer's specimens, while among the 

 Yunnan material this segment varies from asymmetrical to nearly 

 symmetrical. The fusion of the last two thoracic segments, the chi- 

 tinous growth on the middorsal region of the last segment, and the 

 winglike expansion of its distal outer edge are the same. 



The abdominal segments of these two species are quite different. 

 Kiefer described his 1929 females as having a genital segment twice as 

 long as the anal ; while no description of this segment was given for 

 his 1934 specimens, his drawing (fig. 1), showed a genital segment 

 two to three times as long as the anal. But in female T. hehereroides 

 the genital segment is five to seven times as long as the anal. Kiefer 

 mentioned in 1929, and merely figured in 1934, a sensory hair per- 

 ceivable on the left side of the expanded anterior half of the genital 

 segment. 7\ hebereroides has fine sensory hair on both sides of the 

 expanded portion. Both species show an asymmetrical genital seg- 

 ment whose right side is elongated caudally. The anal segment of the 

 East Indies species is distinct from that of the Yunnan species. In the 

 case of the former, Kiefer (1929a) stated that the anal segment still 

 showed its origin from two previous segments, and in his later paper 

 (1934, fig. 1) he delineated an anal segment slightly longer than 

 the f ureal rami and possessing distinct signs of two previous anal seg- 

 ments. In T. hebereroides from Lake Erh Hai the anal segment is 

 shorter than the f ureal rami and consists of a single piece only, without 

 any sign of its being derived from two earlier segments. 



