26 CALIFORNIA ACADEMY OF SCIENCES. 



This very distinct species may be recognized immediately 

 by its rather narrow head, broadly rounded behind, and 

 having the basal angles almost obsolete. The type is a male; 

 the fifth segment is broadly emarginate almost throughout 

 its width at apex, the sides of the notch being very strongly 

 convergent and distinctly incurvate, each bearing a por- 

 rected fringe of nine robust, black, short and rather closely- 

 placed spinules; the porrected process at the bottom of the 

 emargination is very short and rather narrow, scarcely wider 

 than the fimbriate sides; it is broadly and feebly sinuate at 

 apex; sixth segment parabolically emarginate at tij), the 

 notch being slightly wider than deep, exterior angles nar- 

 rowly rounded; seventh narrowly and acutely incised or di- 

 vided along its lower surface as in the preceding species. 



The structure of the posterior tibiae is peculiar to the genus 

 as far as I have observed. 



21 — L. greg'alis u- sp. — Moderately slender, black, abdomen scarcely paler 

 at tip; elytra slightly piceous; legs d irk castaueous, tibiae toward tip and tarsi 

 paler; antenna piceoiis-black at base, fuscous in the middle, testaceous at 

 tip; pubescence sparse anteriorly, rather long, dense and coarse on the 

 elytra, \evy fine, dense and short on the abdomen, not conspicuous; integu- 

 ments polished. Head rather large, as wide as long; base broadly and feebly 

 arcuate, angles broadly rounded; sides parallel and distinctly arcuate; epi- 

 stoma broad, moderately produced, truncate; antennal tuberculations small, 

 rather prominent; labrum moderate, teeth slightly defiexed, small, equilat- 

 ero-triangular, antennae distinctly shorter than the head and prothorax 

 together, second joint slightly shorter and distinctly more robust than the 

 third, distinctly longer than the fourth; surface rather strongly convex, 

 finely, very feebly and densely imnctate; median line rather wide, Prothorax 

 moderate, slightly longer than wide, very slightly narrower than the head; 

 sides parallel, nearly straight in the middle; base broadly and feebly arcuate, 

 broadly sub-truncate in the middle; apex strongly and evenly arcuate at the 

 sides; nuchal emargination narrow, not one-third as wide as the disk, rather 

 strongly incurvate; apical angles very broadly rounded, basal slightly more 

 broadly so; disk transversely and moderately convex, very finely mar- 

 gined along the base, rather coarsely, very sparsely and excessively' feebly 

 punctate in the middle, much more finely, distinctly and densely so at 

 the sides; median impunctate area rather broad. Elytra at base very slightly 

 wider than the pronotum, scarcely wider than the head; sides very slightly 

 divergent jDosteriorly and very feebly arcuate; together broadly, roundly 

 and very feebly sinuate behind; disk one-fourth longer IJian wide, one-third 



