Diaptomus. 
195 
Diaptomus sanguineus Forbes. 
Plate III. Figs. 1-3. 
1876. D. sanguineus Forbes (17) pp. 15, 16 and 23, figs. 24, 
and 28-30. 
1882. D. sanguineus Forbes (22) p. 647, pi. VIII, figs. 1-7, 
and 13. 
1884. D. sanguineus Herrick (26) p. 138, pi. Q, fig. 12. 
“ ££ minnetonka Herrick (26) p. 138, pi. Q, figs. 8-10. 
1889. u sanguineus DeG-uerne and Richard (32) p. 20, pi. 
IV, fig. 24. 
This species, which is found in pools in the spring months, 
Is readily recognized by the. characters of the male antennae 
and fifth feet. My specimens differ in minute particulars from 
the figures given by Forbes; the lateral spine on the terminal 
joint of the outer ramus of the right fifth foot in the male is 
nearer the distal end of the joint, while Forbes’s figure makes 
Its position nearly median; the blunt spine on the inner angle 
of the second joint of this foot is a little longer than the spine 
at the outer angle, instead of shorter, as in his figure. 
D. minnetonka Herrick is probably a variety of D. san¬ 
guineus. 
Diaptomus leptopus Forbes. 
Plate III. Figs. 4 and 5. 
1882. D. leptopits Forbes (22) p. 646, pi. VIII, figs. 17-19. 
1884. “ longicornis var. leptopus Herrick (26) p. 140. 
1889. “ leptopus DeG-uerne and Richard (32) pi. II, fig. 19, 
pi. Ill, fig. 9. 
Forbes, in his description, states that the antepenultimate 
segment of the right male antenna bears a small hook. I have 
failed to find a hook in my specimens; the segment is armed 
only with a very inconspicuous hyaline lamella. DeG-uerne and 
Richard have also noted the absence of the hook. 
