﻿COPEPODS FROM LAKE ERH HAI, CHINA — HSIAO 187 



lateral margin. The anal sinus was described as narrow and V-shaped, 

 less than one-fourth of the abdomen length, instead of deep (Meehean) 

 or cut almost to the center (Thiele and Tokioka). The second an- 

 tenna was both figured and described as having six joints, basal one 

 large, terminal five much smaller and subequal, instead of Thiele's 

 4- jointed antenna with a spine-covered wart on the two proximal 

 joints and with the third comparatively short and fourth long. Both 

 Tokioka and Meehean said nothing about the number of joints though 

 their figures indicated a 4-jointed second antenna. Three long, acu- 

 minate posterior spines were described on the raised knob of the 

 basal plate of the maxilliped (Thiele's hind maxilla), while Tokioka 

 said there were two, and Thiele said nothing but indicated two setae 

 on that structure in his figure 95. But the most outstanding feature of 

 difference is perhaps the nine small segments, like a row of beads, 

 described as forming the chitinous rib supporting the margin of the 

 sucking cup (see also his fig. 69), for all the other authors agreed in 

 describing one long basal and five distal (5 to 7, according to Meehean) 

 segments. Wilson's description of the male showed no material dif- 

 ference from the other writers. It will be noticed that in view of 

 these last four points of difference Wilson's A. jaj)onicus obviously 

 could not be the same species as Thiele's. 



A. trilineatus was fi.rst described as trilineata by Wilson (1904), 

 from a single female taken from a goldfish in Macon, Ga., but in a 

 later publication (1916) on another female from Henderson, Ky., 

 he corrected the name to A. trilineatus. Cockerell (1926) reported a 

 third female from Boulder, Colo., and suggested that it might be 

 closely related to A. coregoni Thorell. The male of trilineatus was 

 first described by Guberlet (1928), who examined both males and fe- 

 males taken from goldfish at Seattle, Wash. Guberlet showed in 

 one of his figures (fig. 1), without mentioning it, that the dorsal 

 ridges on the carapace are forked. This is in contrast to Wilson's 

 statement (1902) that none of the American species has such a 

 modification, which he believed could be used to distinguish American 

 from European species. Wilson reiterated the character again ( 1944) 

 in his posthumous paper both in writing and in figure 79. Guberlet 

 gave a description of the male accessory organs which compares well 

 with Meehean's (1937) and Wilson's (1944) accounts. In his ad- 

 ditional notes on A. trilineatus Meehean (1937) compared his speci- 

 mens from goldfish at Natchitoches, La., with A. foliaceus and A. 

 coregoni from Europe and with type specimens of trilineatus from 

 the National Museum. He called attention to the presence of 4- 

 jointed second antenna, instead of the 3-jointed ones reported by 

 Wilson and Guberlet, and clarified the structure of the chitinous ribs 

 of the sucking cups and the shape of the respiratory areas* Two 



