100 PEOCEEDINGS OF THE NATIONAL MUSEUM vou 89 



with fine procumbent hairs; apex widely truncate and ciliate. Abdo- 

 men poHshed, subpruinose at sides; surface finely and densely punctate 

 with short and erect hair; segments 4 and 5 together forming between 

 them a deep transverse sulcus, surface of each punctured nearly as in 

 the preceding segments; sixth polished, faintly longitudinally sulcate 

 at center, impunctate at middle, with a few coarse punctures at sides. 

 Hind tibia with very dense and long hair on the apical three-fourths 

 of the inner surface ; first segment of the hind tarsi gradually widened 

 toward the apex, the latter nearly half as wide as the length of the 

 segment. First segment of front tarsus with a very long, sharp spine 

 at inner apex, the width of the segment at the apex about three- 

 fifths of its total length, second segment without inner, apical spine. 

 All claws finely crenulate or serrate along a single margin, usually 

 without larger intermixed teeth, at most with a very faint suggestion 

 of a larger median tooth and that usually on the hind claws, if present 

 at all. Hind tarsal segments each with a moderately dense patch of 

 long hairs arranged in a row on each side of the under surface and 

 pointing outward. 



Female. — Antennal club slightly shorter than the funicle. Abdo- 

 men evenly convex, highly polished and very finely, sparsely punctate 

 at center; apical half of the fifth segment flattened transversely; sixth 

 segment one-fourth shorter than the preceding and with coarse sparse 

 punctures. Hind tibia with hairs only moderately dense and not at 

 all fine and ciliate ; hind tarsi sparsely hairy. All claws with a strong 

 tooth above the middle, the surface between tooth and claw base 

 very minutely serrate or crenulate. First segment of front tarsus 

 with a strong imier spine, this smaller than in the male. 



Length. — 12-15.5 mm. Width. — 6-7 mm. 



Types. — Holotype and allotype are from Koehler, N. Mex., and 

 are in the National Museum (No. 53766). 



Paratypes: Males, 38; females, 39. New Mexico: Koehler [U.S. 

 N.M. and Saylorj; prairie near Koehler (Wickham) [U.S.N. M. and 

 Saylorl; Hot Springs, 7,000 feet [U.S.N.M. and Saylorj; Las Vegas 

 (Linell) [U.S.N.M.]. Texas: "S. Texas" [Robinson]. 



Remarks. — In the large series at hand there is very little external 

 variation and apparently none in the male genitalia, which closely 

 resembles those of L. Jimbripes but are constantly difl'erent in the 

 shape of the aedeagus. The key characters should readily separate 

 the two species. 



The following notes, taken at the tune of capture of part of the 

 specimens (by V. L. Wildermuth, at Koehler, N. Mex., July 3, 1914), 

 should be of much interest: "Tonight there occurred a remarkable 

 flight of this beetle. The air was full of them, and the roar, for it 

 was more a roar than a buzzing, from them was wonderful. They 



