NATURAL SCIENCES OF PHILADELPHIA. 41' 



oblique, rounded, evidently (disk more sparingly) punctate; scu- 

 tellum alutaceous ; elytra irregularly punctate ; under side and 

 epipleurae nearly smooth. L. .15 Texas. 



Metachroma (Clievr.) (fyp. quercata, Fab.) 



Antennfe with the second and third joints equal, fourth as long as the 

 fifth ; posterior tibise broadly emarginate at tip ; eyes bordered by a deep 

 impression. 



1. M. angustalum, sp. n. 



Narrow, parallel, black, base of antennje, legs, and upper sur- 

 face 3^ellow ; head shining, sparsely punctate, postocular sulci 

 faint, medial line impressed ; thorax broader than long, sparingly 

 punctate, anterior angles not auriculate ; scutellurn alutaceous, 

 with two or three impressed punctures ; elj'tra punctate striate, 

 the first three regular, the others rather confused, especially to- 

 wards the apex ; ventral segments sparingly and obsoletely punc- 

 tate. L. .23. Missouri, Illinois, L. Superior, Kansas. 



J* Yentral segments concave, first with a small acute tubercle 

 on the apical margin in the middle. 



Var. Thorax more or less suff'used with black. 



Var. El3-tra black, margins narrowlj^ pale. 



Vai^. Elytra entirely black, thorax and scutellurn red. 



2. M. californicum, sp. n. 



Subelongate parallel, reddish-brown, shining; head strongly 

 and rather closelj'^ punctate, median line impressed, ocular sulci 

 not converging; thorax slightly produced in front, sides acutely 

 reflexed, slightly rounded, disk sparingly, sides closely punctate ; 

 elytra regularly striate punctate, interstices very finely and spar- 

 ingly punctulate, eighth broad. L. .18. California (Horn). 



3. M. ustum, Lee. Pr. Acad., 1858, 85. 



Brownish-red varied with paler ; head evidently punctate, cly- 

 peus with tlie sides reflexed, broadlj' emarginate, labrum promi- 

 nent, trilobed ; thorax broader than long, evidently more closely 

 punctate, sides rounded, anterior angles auriculate ; el3'tra strong- 

 ly punctate striate, the punctures obsolete towards the apex, the 

 striae confused externally. L. .23-.24. Texas (Leconte). 



4. M. dubiosum (Say), J. Acad., iii. 447; sutnrale, Lee. Pr. Acad., 1858, 85. 



Black, legs pale, knees broadly infuscate, head nearl}^ smooth, 

 two frontal spots, a fine raised middle line on the front ; thorax 

 4 



