CALIFORNIA ACADEMY OF SCIENCES. 25 



Tliis species, thougli closely allied to tlie preceding, dif- 

 fers from it in sucli an assemblage of minor characters as to 

 leave very little doubt of its distinctness; among these are 

 its more slender form, still more slender prothorax, and 

 more particularly the elytral punctuation which is decidedly 

 more si3arse, feebler and less rugulose; the abdomen also is 

 not pale at tip, and the el^'tra are paler in color in lactuosa. 



20 — L. retrusa n- sp. — Moderately robust; bead, pronotum and abdomen 

 tbrongbout black; elytra dark rnfo-piceous, scarcely perceptibly and grad- 

 Tially paler toward the apices; legs rather pale brownish; antennae, labrum 

 and palpi piceoiis-black, the former slightly i^aler toward tip; pubescence 

 sparse anteriorly, rather dense and very fine on the elytra, twice as dense, 

 very short and fine on the abdomen, not very conspicuous; integuments 

 polished. Head moderate; base broadly and distiuctl}^ arcuate, angles very 

 broadly rounded; sides behind the eyes rather short, parallel and nearly 

 straight; surface slightly longer than wide, finely, extremelj'^ feebly and 

 rather densely punctate; median line rather broad; epistoma very short, 

 rather narrow, truncate at apex; labrum moderate, teeth small, approximate, 

 rather long and very acute; antenna nearly as long as the head and protho- 

 rax together, second joint distinctly shorter than the third, slightly longer 

 than the fourth. Prothorax rather large, quadrate, just visibly wider than 

 the head; sides parallel and nearly straight; base broadly, very evenly and 

 rather strongly arcuate throughout; apex feebly arcuate; nuchal emargina- 

 tion two-fifths as wide as the disk, broadly and distinctly rounded; apical 

 angles rather narrowly rounded, basal scarcel}'' more broadlj" so, very obtuse; 

 disk very finely margined along the base, broadlj'^, nearly evenly and mod- 

 ^ratelj^ convex, very minutely, feebly and sparsely x^unctate in the middle, 

 twice as densely, but still rather sparsely so at the sides; median line rather 

 broad, equal throughout. Elytra at base distinctly wider than the prono- 

 tum: sides nearly parallel, feebly arcuate posteriorly; together broadly, 

 roundly and distinctly sinuate behind; disk one-fifth longer than wide, one- 

 third longer than the pronotum, rather broadly and strongly impressed along 

 the slightly elevated suture, more distinctly impressed near the scutellum, 

 very finely, rather feebly and very densely punctate; punctures sub-asperate 

 and distinctly finer and denser toward the apex. Abdomen very slightly 

 narrower than the elytra; sides parallel and very nearly straight; surface 

 very minutely, evenly, excessively densely f ebly and sub-asperately punc- 

 tate. Legs rather slender; first joint of the posterior tarsi one-fourth longer 

 than the second, much shorter than the fifth; anterior tarsi very slightly 

 dilated; posterior tibite obliquely and feebly excavated exteriorly at the apex, 

 the excavation being smooth and glabrous, and bounded internally by a dense 

 row of closely-placed and very fine erect spinules. Length 4.1-4.3 mm. 



Mendocino Co. (Anderson Val.), 5. 



