1888.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 501 



C. V. It.), 2 5,29; Missouri, May (coll. C. V. E.), 15,12; New Jersey, 

 New York, Pennsylvania (coll. J. B. S.), 4 5,19; District of I Solum- 

 bia, large series collected for the Museum. 



Florida is not given by Dr. Horn as a locality for this species. The 

 species superficially is a very compact one; but on looking over a large 

 series quite a decided variation of the sexual characters appears. The 

 punctuation of the venter varies quite considerably, and the gibbous 

 ridge of the penultimate segment of the 5 may be very feeble, or quite 

 prominent; may be close to the hind margin, or from near the front mar- 

 gin and strongly overhanging. The depression on the terminal seg- 

 ment is also variable in depth and extent ; occasionally it forms a regu- 

 lar fi, the closed upper part extending to the middle of the penultimate 

 segment. The 9 is equally variable ; sometimes there is no trace of a 

 depression in the last segment; in other specimens there will be a deep, 

 semicircular depression with very well defined margins, which does not, 

 however, extend to the penultimate segment. 



The genitalia of both sexes are distinctive. In the 8 the claspers 

 are symmetrical and characteristic. In the 9 the superior plates are 

 peculiarly modified and sculptured, while the small, somewhat heart- 

 shaped pubic process sets in between them. 



30. L. definita &imth. = diffinist Horn. 



Not in the Museum collection. Dr. Horn says that after examina- 

 tion of Blauchard's type, he finds that he had mistaken the species. 

 Blanchard's diffinis is the comans of Burmeister, and has priority, while 

 diffinis Horn thus becomes nameless. Dr. Horn kindly allowed me to 

 study a 8 specimen, from which the figures are made. The claspers 

 are dissimilar, as usual, and are quite characteristic, resembling nothing 

 in the near neighborhood very closely. 



31. L. vehemens Horn. 



There is a $ and 9 from Kansas in the Museum collection. The angu- 

 lation of the posterior femur of the 8 is a strong character, as is also 

 the peculiar curve of the tibial spur. In ventral characters it very 

 closely approaches the species which I have named dubia. The 9 is 

 more difficult to distinguish from some of the fusca forms, but if the 

 transverse impression of the penultimate segment is constant it may 

 serve as an aid. Some specimens of the fusca series, however, also 

 show this character, though not so well marked. 



The genitalia of both sexes have been examined aud also empha- 

 size the affinity of the species. The claspers of the 8 are dissimilar — 

 less so when viewed from above, and quite characteristic. The 9 ap- 

 proaches more nearly to the grandis type, but the pubic process is 

 much reduced, cleft nearly to the base, while the superior plates are 

 small. 



L. fusca auct. 



It is in this group that the greatest apparent difficulty in the identi- 

 fication of species is encountered. The forms of the typical species are 



