1873.] oOJ [Horn. 



gidium moderately, coarsely and sparsely punctured, pygidium minutely 

 punctulate. Anterior tibiae bidentate. Length .10-. 13 inch ; 2.5-3 mm. 

 Occurs at San Diego in decomposing Opuutia. 



P. Tejonicus, n. sp. 



Oblong, parallel, subcylindrical, piceous, legs and antennas reddish- 

 brown. Head sparsely imnctulate, frontal stria obsolete. Thorax 

 broader than long, slightly narrower in front, sides feebly arcuate, sur- 

 face rather coarsely but sparsely punctured, marginal stria fine, entire. 

 Elytra parallel, longer than wide conjointly, surface sparsely punctulate, 

 subhumeral stria fine, entire, dorsals 1-5 entire, sutural more deeply im- 

 pressed, abbreviated at apex and base. Propygidium coarsely and 

 moderately densely pu.nctured, pygidium more finely and less densely 

 punctured. Prosterniun bistriate striae joining at tip. Mesosternum 

 with marginal stria entire. Anterior tibiae finely 4-dentate, middle 

 tibiae with two subapical, and a supra median spinule, hind tibiae with 

 two subapical spinules. Length (entire) .06 inch ; 1.5 mm. 



This insect resembles to a remarkable extent some of the species of 

 Platysoma or Cylistix. 



One specimen. Fort Tejon, California. 



P. eonsoi'S, Lee. Ann. Lye. V., p. 164; Mars. Mon., 1855, p. 88, pi. 8, 

 No. 22, fig. 1. 



Resembles opuntue, and differs in having the inner subhumeral stria 

 abbreviated at base, and a short outer subhumeral visible at the middle 

 of the sides only. The fifth dorsal and also the sutui'al are also more 

 decidedly obliterated at basal end. Length .08-. 10 inch ; 2-2.5 mm. 



Occurs with the preceding, and extends its habitat southward into 

 Mexico, etc. 



P. gilensis, Lee. Ann. Lye. V., p. 164. 



Closely resembles censors, but differs in having the subhumeral striae 

 entirely obliterated. Length .08-. 10 inch ; 2-2.5 mm. 



Occurs in the valley of the Gila River, Arizona. 



This species is not synonymous with P. tenellus, Er., as stated by 

 Marseul. 



P. tenellus, Er. Jahrb., 1834, p. 170 ; Mars. Mon., 1855, p. 94, pi. 8, 

 Xo. 22, fig. 7 ; corticalis, Lee. Ann. Lye. V., p. 163. 



Oblong oval, depressed. Elytra with four dorsal striae entire, fifth and 

 sutural abbreviated at base, subhumeral very short, faintly impressed, 

 abbreviated at apical and basal extremities. Propygidium coarsely, 

 pygidium very finely punctulate. Length .06-.08 inch ; 1.5-2 mm. 



The species which we have long known as corticalis, Lee, agrees per- 

 fectly with the description and figure of Erichson's tenellus, and it is 

 probably by an accidental error that the preceding species was placed as 

 the synonym. 



Occurs along the borders of the Colorado River, California, under bark. 



