"260 lU'nwis State. LaJtordtorii of Ndtural History. 



to have found this spine, hut Schmeil confirms Forhes's state- 

 ment. The inner two spines on the last segment are serrate 

 on hoth margins, hut this fact is shown in none of the figures, 

 nor is it mentioned in the literature referred to. The first 

 segments of the fifth pair of legs in the male are each provided 

 with a rather delicate seta near the outer distal angle. This 

 is siiown in the published figures, but Lilljeborg mentioned 

 only the one on the left leg. The ordinary appearance of the 

 lamina of the second segment of the right leg is l)est shown in 

 Forhes's figures. 



This species is quite common in the western United States, 

 having been found to occur in considerable quantities in col- 

 lections from Nevada, Idaho, Oregon, Washington, and Mon- 

 tana, and further collections will no doubt show a still more 

 general distribution. It occurred in collections with l)lap- 

 to)inis a^hlandi Marsh and with D. in'nuitiis Lilljeborg. 



Epischura lacustris Foebes. 



Scopiphora wMjans (?), Pickering. "44, p. ()2. 



Epischura lacustris. Forbes, 'Sia, p. G48, PI. VIII., Fig. 15, l(i, 21-23, 



2,5-27; PI. IX., Fig. 8. 

 Epischura lactistris, Herrick, "84, p. 131, Pi. (^, Fig. 15. 

 Epischura lacustris, de Guerne et Richard, "SOb, p. 90, PJ. IV.. Fig. 



3, 9, 10. 

 Epischura lacustris, Forbes, *90, p. 704, PI. I.. Fig. 1-5; PI. II., Fig. 7. 

 Epischura lacustris. Forbes, '93, p. 255. 

 Epischura lacxistris. Marsh, "93, p. 200, PI. IV.. Fig. (i. 

 Epischura lacustris, 31arsh, '95, p. 10, PI. 11, Fig. 1-6; PI. III.. Fig 



1-6. 

 Epischura lacustris, Ilerrick and Turner, '95, p. 82. PI. XIII., Fig. 



15. 



Of medium size. Body elliptical, widest before the middle. 

 Cephalothorax composed of six segments, the first two sub- 

 equal and together somewhat longer than the remaining four. 

 Third, fourth, and fifth segments subequal and together about 

 equal to the first. Sixth segment slightly longer than any of 

 the three preceding ; not produced laterally. Abdomen fiexed 

 to the right, the first segment very short. Second segment the 

 longest and about equal to the remainder of the abdomen 



