18 U.S. NATIONAL MUSEU3M BULLETIN 290 



38(37). Intervals two and four yellow throughout, devoid of dark pigment 



(figs. 39 and 40) 39 



Intervals two and four dark, at least in part 41 



39(38). First elytral interval lacking dark markings or only vaguely darkened 



near suture (fig. 39) ; Texas, New Mexico . amatus amatus Haldeman 



First elytral interval dark in part or throughout; Colorado, New 



Mexico, Wyoming 40 



40(39). Vitta on third interval broadly interrupted (fig. 95) ; pronotum red with 

 only an indistinct median light stripe on disk (fig. 6). 



amatus fractilineatus, new subspecies 



Vitta on third interval not or narrowly interrupted (fig. 40) ; pronotum 



red or black with median stripe, two basal oblique spots and lateral 



margins yellow, oblique spots sometimes expanded or reduced (fig. 7). 



amatus apicedens Fall 



41(38). Pronotum laterally with a dark red to black spot, sometimes joining 



adjacent vitta (figs. 4 and 5) ; southeastern U.S. to Arizona ... 42 



Pronotum laterally lacking a dark spot; various localities 44 



42(41). Elytra with a common, submedian, transverse, undulating band 

 attaining lateral margin (fig. 105); pronotal spot larger, about half 

 size of an eye, usually joining adjacent vitta (fig. 5) ; Arizona. 



maccus, new species 

 Elytral markings not as above; pronotal spot smaller, not joining 



adjacent vitta (fig. 4) ; Florida to Arizona 43 



43(42). Dark markings of dorsal surface black, more extensive (fig. 62); length 



4.3 to 6.4 mm.; Florida to Texas bivius Newman 



Dark markings of dorsal surface bright red to dull red, less extensive 

 (fig. 108); length 3.9 to 4.3 mm.; Arizona. 



pseudomaccus, new species 

 44(41). Elytra at apical half with only two apical spots and a small (to absent) 

 common sutural spot (fig. 103) ; Minnesota. 



leucomelas trisignatus, new subspecies 

 Elytra at apical half with more extensive markings than above; locality 



not as above ... 45 



45(44). Elytron with three pair of spots (rarely touching), basal pair largest 



(figs. 55 and 61) 46 



Elytron not as above, if spotted, with discal two spots largest, often 



confluent (figs. 56, 58, and 59) 47 



46(45). Pronotum with outer dark stripe on each side clearly wider than inner; 

 inner of basal elytral spots broadly attaining suture (fig. 55) ; 



Louisiana cupressi Schae0"er 



Pronotum with outer dark stripe on each side about equal in width to 

 inner stripe; inner of basal elytral spots not or narrowly touching 



suture (fig. 61); Texas texanus SchaefFer 



47(45). Basal transverse band of elytra attaining lateral margin and joining 

 second elytral band at suture (fig. 59) ; Colorado. 



leucomelas Titticollis Leconte 



Either elytral markings or locality otherwise 48 



48(47). Dark pronotal vittae and/or discal two spots of each elytron nearly 

 always confluent (figs. 12, 57) ; California, Arizona, New Mexico. 



castaneus Leconte 

 Dark pronotal vittae and discal two spots of each elytron rarely touch- 

 ing (figs. 15, 58) ; east U.S. to Utah and New Mexico. 



leucomelas leucomelas Sufifrian 



