322 GEOL. AND NAT. HIST. SURVEY OF MINNESOTA. 



''The post- abdomen forms two loug, movable rami, which are well 

 developed and terminated by two claws of unequal length, and in fine 

 specimens are serrated on their inner edge near the apex. The rami 

 themselves are also serrated." [In European specimens and in speci- 

 mens taken by the present writer to beloEg to this species the abdomi- 

 nal rami are not serrated.] 



Mr. Deming claims to have found the male of Cijpris virens. I have 

 reason, however, for supposing that he has confounded the males of 

 some other species (perhaps G. crena) with Cypris virens. 



Habitat: Granville, Ohio (Herrick, 86). 



Cypris perelegans Herrick. 



Plate LXXIII. 



1887.— Cypris perelegans C. L. Herrick (86), p. 27; PI. Ill, Figs. 7-12. 

 1894. — Cypris pereletjans C. H. Turner (216). 



Length 3.60 mm. Height 1.72 ram. Width 1.40 mm. 



"Carajjace of largest size, elongate sub-oblong, sides nearly parallel, 

 upper margin nearly straight, lower outline with two sinuses and two 

 slight convexities, produced to form a slight tooth behind; greatest 

 height at one fourth the length from the posterior, equal to less than 

 half the length; width greatest somewhat in advance of the middle, 

 about four-tenths the length; color clear, pale yellow, with a well-de- 

 fined pattern in deep brown, pattern consisting of a sigmoid band 

 crossing the middle of the valves, giving off spurs at each flexure, 

 and sundry other spots, as well as an anterior marginal band; surface 

 shining, minutely dotted, slightly hairy at margins; lucid spots con- 

 sisting of two large irregularly pentagonal approximated spots, with 

 three smaller ones grouped below; appendages very similar to G. virens; 

 antennte seven-jointed, slender, basal segment very large, third 

 elongated, four succeeding nearly equal in length, fourth and fifth 

 segments each with two long sette above, sixth with four long and one 

 shorter sette, apical segment with four very long setfe, fifth segment 

 with two setre of moderate length below; antennules (antennae) slender, 

 apical segment with two serrate claws and two slender sette, fourth 

 (antepenult) segment the same, third segment with four long and two 

 shorter setfe, second segment with six long pectinate setse reaching to 

 end of terminal claws; labrum with claw-like appendages bearing 

 seven teeth, the inner being double, medianly the labrum appendaged 

 with pectinate plates; the mandibles furnished with six strong teeth, 

 two pectinate setee and several small spines, the palp being well de- 

 veloped; first maxilla with short lobes, the anterior of the one-jointed 

 lobes with four very strong toothed spines; first foot with five seg- 

 ments, the apical one being very small and bearing a single very long 



