458 CALIFORNIA ACADEMY OF SCIENCES. 



couoidal, as robust as the second; third one-half long-^r than the second, 

 fusiform, equal in thickness to the second, acuminate at apex, having a 

 slender terminal process. Head with three small spongiose foveas at the 

 apices of an equilateral triangle; eyes large, convex, rather coarsely granu • 

 late; clypeus angulate at the sides, Pronotum with three small basal foveas 

 connected by a fine impressed line. Elytra each with one sutural and one 

 discal stria. Abdominal border wide, nearly flat; first visible segment with a 

 median basal carina; first two segments equal in length. Prosternum exca- 

 vated in front of the coxae; legs rather long; femora slightly robust, the 

 anterior with a short longitudinal carina beneath and near the base; middle 

 tibiae strongly arcuate; tarsi long and slender, three- jointed; basal joint very 

 small; second and third elongate, the latter the longer; claws simple, mode- 

 rate in length, equal, slender; anterior trochanters with a small posterior 

 tuberculate tooth; intermediate with a long corneous process, projecting 

 posteriorly from the apex obliquely outward; middle coxae narrowly, poste- 

 rior rather widely separated. 



The modifications of the trochanters and the inferior ca- 

 rina of the anterior femora are not sexual characters, but 

 are nearly as well developed in the female as in the male. 

 Pytna appears to belong in the neighborhood of Tyrus, but 

 differs in the structure of the palpi. 



P. COrticina, n. sp.— Bright rufous, abdomen piceous; integuments pol- 

 ished; pubescence fine, rather short, moderately dense. Head very slightly 

 longer than wide, nearly flat above; eyes large, at more than their own 

 length from the base; genae convergent, feebly arcuate to the neck, clothed 

 with longer, more conspicuous pubescence; fovese small, the two posterior 

 slightly behind the middle; antennal tubercle slightly transverse, feebly 

 canaliculate in the middle; antennse long and slender, distinctly more than 

 one-half as long as the body, basal joint subcyliadrical, much longer than 

 wide, second slightly narrower, as long as wide, very feebly obconical, three 

 to six subequal, very slightly shorter and narrower than the second, nearly 

 as long as wide, seventh and eighth very slightly smaller, equal, ninth as 

 long as the two preceding together, feebly obconical, one-half longer than 

 wide, tenth as long as the ninth, slightly thicker, feebly obconical, eleventh 

 ovoidal, acuminate, one-half wider than and nearly twice as long as the tenth. 

 Prothorax widest at one-third the length from the apex; sides distinctly 

 convergent and nearly straight to the apex; very feebly convergent and just 

 visibly sinuate to the base; the latter broadly and rather strongly arcuate, 

 scarcely perceptibly narrower than the disk, one-half wider than the apex; the 

 latter transversely truncate; surface convex, impunctate, except near the 

 base; transverse line fine, parallel to the basal margin and distant from it by 

 one-fifth the length; foveas very small; disk slightly longer than wide, very 



