Dec, 1922.] Dawson : New Species of Serica. 167 



lateral margins and about three fifths of the way from the base, a small, 

 slightly impressed area with a pigmented spot on its posterior side. Meas- 

 urements of pronotum : width through posterior angles, 31; width through 

 anterior angles, 22; length on median line, 17.6. Scutellum finely punctured, 

 more closely so toward the sides ; length, 7.6 ; width, 7.6. 



Elytra with rather feebly impressed, line-like striae, each stria with a 

 single slightly irregular row of rather small, but deep, setigerous punctures, 

 separated by one and one half to two times their own diameters ; the hairs 

 pallid, inconspicuous, and probably semi-recumbent ; the intervals feebly con- 

 vex, with the second, fourth, and sixth slightly wider than those between, 

 sparsely and very irregularly punctured, the punctures slightly finer than the 

 strial punctures, and often close to them. Length of elytra, 55 ; width, 42.5 



Metasternum and posterior coxal plates, especially the latter, shining, 

 and rather strongly punctured, the punctures separated by one to two times 

 their own diameters. Abdominal sternites opaque, finely and indistinctly 

 punctured, and with the usual, single, transverse rows of coarse, setigerous 

 punctures. Under surface thinly clothed with semi-erect yellow hairs ; the 

 pubescence longer and denser on the anterior and middle legs and meso- 

 sternum. 



Length of genital armature of male, 2.6 mm. (PI. XXII). The membrane 

 below the base of the claspers extends half way down the ventral surface 

 of the stalk of the armature and is broadly divided by a median, tapering, 

 chitinous process extending vipward to nearly, or quite, even with the 

 apex of the stalk. This important feature is indicated, though perhaps not 

 very clearly, in the accompanying plate. 



$. Unknown. 



Types : three males in the Le Conte collection, from San Diego, Cali- 

 fornia, labeled "mixta i," "mixta 2" and "mixta 3." 



All three specimens were dissected, and type number two was used 

 for the drawings and description here given. For the privilege of 

 dissecting and studying these types the writer is greatly indebted to 

 Dr. Banks. 



Mixta is known to the writer only by the Le Conte types, although 

 many specimens of California Scricas have been examined. Per- 

 haps it is not a common species as has been supposed. 



Serica curvata Le Conte. 



Serica curvata Le Conte, Journ. Acad. Nat. Sci., Phila., Ser. 2, iii, p. 276. 

 1856. 



(^. Length, 7-10 mm.; width, 3.75-5.5 mm. Color varying from, amber 

 brown to a very dark auburn, surface somewhat shining, but not polished, 

 and in the darker specimens showing distinct traces of a sericeous, metallic 

 luster. 



Clypeus with discal area nearly or quite level with the front, but slightly, 



