150 BULLETIN 63, UNITED STATES NATIONAL MUSEUM. 



Eiylni strongly convex, sculptured with series of small. l)riglit tu- 

 bercles, interstices with small granules uniseriately placed (LeConte). 



Diagnostic characters. — One of the most distinct species of the 

 genus. The sides of the pronotiim are slightly Init not very distinctly 

 sinuate behind the apical angles. The elytra 1 sculpturing consists of 

 a series of Avell-developed tubercles upon each interval, and series of 

 small granules represent the stripe. The coarseness of the sculpturing 

 is unique aiwl is only approached by that of </rainiJata. The latter 

 species has the form of quadricollis, the humeri are distinct and some- 

 what produced, and the elytra are sculptured with rows of smooth, 

 moderately elevated, and somewhat elongate tubercles; also more or 

 less subseriately punctate each side of the suture, the anterior femora 

 are more or less siniuite. 



Variations, — The post-apical sinuations of the pronotal sides are at 

 times scarcely evident in the males. 



The moderate series of examples before me is of special interest 

 and value, on account of the extreme forms of sculpturing that are 

 included. 



Two specimens from the Panamint and Coso valleys are remark- 

 able for the extreme coarseness of the sculpturing (Form(( fortis). 

 In each specimen the pronotal disc is densely, deeply, and confluently 

 punctate, the interstices smooth and convex. The elytral series of 

 tubercles are notably regular and distinct, except at the extreme sides 

 where confusion and diminution in size occur; elsewhere the inter- 

 stitial tubercles are three times as large as in the specimens from Los 

 Angeles County, and completely fill the width of the interval ; they 

 are very glabrous and shining, very convex to subacute at summit. 

 The strial granules are regular and distinct between the crowded 

 larger tubercles. These insects are less opaque than usual and the 

 largest of the series. 



In the Los Angeles County (Mount Wilson) specimens the prono- 

 tal punctures are smaller, denser, and shallower, with the interstices 

 narrow, scarcely convex, and distinctly opaque. The elytral series 

 of tubercles are regular on the dorsum, at the sides the tubercles and 

 gi-anules become confused and quite e(]ual in size. 



The Kei'u (\)uiity s])ecimens ])reseiit a uiodification of the tyi)ical 

 form of sculpturing. The pronotal ])unctures are moderate in size, 

 irregularly ])laced, frequently with impunctate areas; the interstices 

 are flat, smooth, and shining. The general sizes of the sculptural fac- 

 tors of the elytra are as in the Southern specimens; at base, along the 

 suture, and laterally the tubercles become more or less transversely 

 confluent, losing to a greater or less extent their tubercular charac- 

 ter. producing a transversely rugose and sul)uiuricate effect. 



