﻿NORTH AMERICAN NOTOSTRACA — LINDER 39 



by the varying sizes of the spines on the supra-anal phxle. In the 

 two last mentioned respects, there is good agreement with Packard's 

 description. "Seven more or less well-marked median spines" on the 

 telson, according to Packard, stands in sufliciently good accordance 

 with the condition in this specimen. Bilobation of the supra-anal 

 plate occurs here, in agreement "with Packard's description, but it is 

 to be remembered that this character is not an important one. 



Tentatively, I have placed here another specimen (U.S.N.M. No. 

 82028) which bears only the label "Probably Arizona." 



In a case like this, when there is a little imcertainty about the 

 status of the single existing type specimen, and the original description, 

 is not very good, it may be questionable whether we ought to discard 

 the species or keep it on record. In my opinion, the description is 

 good enough to enable us to identify the species with reasonable 

 accm-acy. However, it seems desu'able to search for more material 

 from the type locality or its vicinity. 



LEPIDURUS LYNCHI, new species 



Figures 14-18; 19, c; 20-27; Plates 3, 4, and 7 (Figure 3) 



Tyjpe specimens.'— YLoloiy^Q (1 9), allotype (1 c/^), and paratypes 

 (Uppsala Mus.); paratypes also in U.S.N.M. (No. 82101); ponds 

 in the upper Grand Coulee, Grant County, Wash; collector J. E. 

 Lynch. Additional paratypes (699, 2cf cf, 5 juniors) from Fish Lake 

 Valley, Nev. ; collector, La Rivers. 



Females (52 specimens): Holotype 11 + 16.5+4.5 = 32 body-rings; 

 paratj-pes ll + (15-18) + (3 + i-5.5)=30+i-34 body-rmgs. Surface of 

 all body-rings smooth, spines on dorsal and lateral quarters of caudal 

 border of legless rings large, smaller on ventral quarter. On penulti- 

 mate ring 9 large, 8 small spines; in paratypes 6-14 and 4-9, respec- 

 tively, the boundary between large and small spines not always 

 sharp, because they may diminish in size gradually. Telson (disre- 

 gardmg supra-anal plate) long, its length almost as great as its width, 

 smooth except for small spines around dorsal sense organs and aroimd 

 bases of caudal filaments. Supra-anal plate 4 mm. in length (24 

 percent of carapace); in paratypes 0.6-8 mm. (7-30 percent of 

 length of carapace, highest percentage being in large specimens). 

 This plate irregularly tongue-shaped, with coarse, small spines on 

 its margui, and 4 rather large spines dorsally in midline; in paratypes 

 broadly triangular, tongue shaped or spatulate, often more or less 

 bilobed, often irregular, with 2-7 dorsal spines. Caudal filaments 

 24 mm.; in paratypes 11-39 mm. 18 body-rings exposed beyond 

 carapace; in paratypes 12-19. Color of preserved specimens greenish 

 brown. Total length disregarding supra-anal plate and caudal 

 filaments, 26 mm.; paratypes 12-45.5 mm. (preserved specimens!). 



