6 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 123 



8. Mesothorax and metathorax not entirely black; cephalic and pronotal 



punctures not exceptionally coarse; antennal club not abruptly 3-seg- 



mented; Arizona, Mexico wehrlei Boyle 



Mesothorax and metathorax entirely black; cephalic and pronotal punctures 

 exceptionally coarse; antennal club abruptly 3-segmented; Arizona, 

 Mexico? thorapsoni Boyle 



9. Elytral striae strongly impressed; maxillary palpal terminal segments not 



exceptionally wide, width about 3.5 times length; lateral edges of post- 



mandibular lobes straight (fig. 7) ; Mexico sola, new species 



Elytral striae not strongly impressed; maxillary palpal terminal segments 

 exceptionally wide, width about 4.7 times length; lateral edges of post- 

 mandibular lobes not straight (fig. 4) ; Brazil . . latipalpus, new species 



10. Elytra not particolored 11 



Elyta particolored 12 



11. Antennae entirely yellow or testaceous; pronotal angle pores of normal 



size; Guatemala rediviva Gorham 



Antennae not entirely yellow or testaceous; pronotal angle pores extremely 

 large; western North America, Mexico? californica LeConte 



12. Pronotum particolored; 60 percent of elytral length behind base not entirely 



yellow; Costa Rica, Central America? divisa (Gorham) 



Triplax alvarengai, new species 



Figure 1 



Diagnostic description: Color variable, ranging from fulvus, with 

 or without elytral apical region darker, to nitidous red; underside 

 testaceous to brownish; number of yellow antennal segments variable; 

 body moderately nitidous. Body shape essentially elliptical, anterior 

 and posterior ends about equally parabolically rounded, ratio of length 

 to width 1.6 to 1; pronotum sub trapezoidal, basal width about three- 

 fifths greater than apical width; elytra widest at about 35 percent of 

 length behind elytral base. Antennal length about equal to distance 

 to pronotal base, club 4-segmented, segment 10 about 3.5 times width 

 of segment 7. Apex of epistomofrontal region of head faintly concave 

 in very shallow arc or V, epistomal apex immarginate. Postmandibular 

 lobes moderate in size, lateral edges somewhat rounded; terminal 

 segments of maxillary palpi strongly widened, width about 3.5 times 

 length; men turn rather small, size and shape somewhat variable. 

 Pronotal punctures not deeply impressed, somewhat more closely 

 spaced and deeply impressed laterally; cephalic punctures much more 

 closely spaced and coarser; elytral striae moderately impressed. 



Variation : Color is somewhat variable. Specimens examined from 

 the Canal Zone displayed a brown to black area in the apical elytral 

 20 to 40 per cent. An examination of the anterior end of the internal 

 sac (fig. 1), however, has shown all of these specimens to be con- 



