PACKABD.J PHYLLOPODS OF NOKTH AMERICA. 347 



tliesG were supposed to represent a different species aud described in tlie 

 Bulletin ofHayden's U. S. Geological Survey of the Territories in 1877. 

 Since then I have received a number of specimens from Wallace, Kans., 

 through Professor Lindahl, some of which were of the same size and 

 state of preservation as the Texan specimens, and which showed no 

 specific differences, and finally, on carefully examining and drawing 

 the feet of specimens from the two States, I found that they could not 

 be separated specifically. 



I append the description of the Kansas specimens from Hayden's 

 Bulletin, which may show how the individuals vary, especially in the 

 male claspers : 



^'- Male. — The claspers (2dantennoe) are much longer than in 8. texanus, 

 reaching, when extended, to the middle of the body, while in S. texanus 

 they only reach a third of the length of the body. The median lobe of 

 thehead, which is very large and long in 8. texanus, reaching nearly as 

 far as the insertion of the basal filamentary appendage of the third 

 joint of the claspers, is, in 8. ivaisoni, not half as large. The two basal 

 joints of the claspers are twice as long and much slenderer than in 8. 

 texanus ; the third joint is nearly as long, while the branches aud spines 

 of the 4th joint, though of the same number, are much longer and slen- 

 derer. Of the longer branch the sup])lementary spine is much longer, 

 and without the small inner spine, while the main branch beyond is bent 

 at right angles, the elbow being much bent, the inside, however, i-egu- 

 larly curved. At the base of the broader and shorter branch are four 

 unequal teeth; one attached to the third joint, the other to the fourth, 

 the two terminal ones very unequal, and the fourth square and three times 

 as large as the third, while the corresponding tooth in 8. texaiiusia long 

 and narrow, and smaller than the one behind it. The genital appendages 

 are long and slender, much as in 8. texanus, being as long as the three 

 segments following the one to which they are inserted. The caudal ap- 

 pendages are much shorter and broader than in ;S^. texanus, each blade 

 being broader, aud tapering regularly from base to tip, not contracted 

 in the middle, nor curved, as in the male of 8. texanus ; on the other 

 hand, they are of much the same form as in those of the female 8. texa- 

 nus. 



^''Female. — Very closely allied to the female 8. texanus, though as a rule 

 somewhat smaller, the eyes being decidedly smaller. The second an- 

 tennce are a little, sometimes much, longer in proportion, and are mu- 

 cronate, as in the other species. The ovisacs are as in 8. texanus, but 

 the eggs are much smaller in proportion. The caudal appendages do 

 not differ materially from those of the males, nor from those of the 

 females of ;S'. texanus. 



'•Length of males, IG™""; females, 12-18"^™. About fifty of each sex 

 examined, although several hundred were casually looked OAer, with- 

 out finding any that approached 8. texanus any nearer than has been 

 indicated. 



" Ellis, Kans., in pools on the prairie, June 28, 29, September 27, and 

 October 10-22, Dr. L. Watson. A large number of half-grown males 

 and females occurred in June. The largest females, those measuring 18 

 millimeters in length, occurred October 22, the ovisacs filled with eggs 

 in some cases; in others, partially or entirely empty. The body was 

 soft and in such a state of preservation as to indicate that they were at 

 the point of dissolution. They were found associated with Thavino- 

 ccphalus, Limnetis, Estheria, Eulimnadia, and Apus lucasanus. The tails 

 were red, says Dr. Watson, and in some the bodies were blue. This re- 

 fers to those which were collected in June and early in July. ' Those 



