352 PROCEEDINGS OF THE NATIONAL MUSEUM vol.93 



Mature color dark brown to black; irons without central pit; 

 punctures of elytra moderate to coarse; antennal club broader, 

 first segment less than one-third its entire length 3 



3. Frons in female longitudinally sulcate below; summit of pro- 



notum concolorous, asperities finer; fore tibia with distal end 



oblique berchemiae Blackman 



Frons in female not sulcate below; summit of pronotum much 



lighter in color, asperities coarser 4 



4. Frons longitudinally carinate above; pronotum distinctly longer 



than wide; elytral punctures not so coarse; body smaller and 



more slender; southeastern United States lobdelli Blackman 



Frons not carinate above ; pronotum not notably longer than wide ; 

 elytral punctures rather coarse ; body larger and stouter ; Ari- 

 zona, New Mexico xylophagus Blackman 



5. Body slender, 3.0 times as long as wide; frons with short, broad, 



cinereous scales ; pronotum distinctly longer than wide ; elytra 



moderately rounded behind texanus, new species 



Body moderately stout, less than 2.7 times as long as wide ; frons 

 with short, fine hairs; pronotum scarcely longer than wide 6 



6. Pronotal vestiture of spatulate setae ; elytra with strial punctures 



smaller and closer, interspaces narrower; declivital vestiture 



nearly uniform vachelliae, new species 



Pronotal vestiture shorter, broader, more scalelike; elytral 

 punctures coarser, not so close, interspaces wider, more rugose ; 

 declivital vestiture notably longer on third interspace- retamae, new species 



THYSANOES TEXANUS, new species 



Plate 30, Figure 13 



Female— Reddish brown with elytra darker ; 1.55 mm. long, nearly 

 exactly 3.00 times as long as wide. 



Frons concave from eye to eye, rather sharply margined at sides, 

 surface shining, reticulate, with fine punctures bearing short, broad, 

 cinereous scales, easily abraded. Eye very large, broad ovate, inner 

 margin entire, facets coarse. Antennal scape (pi. 30, fig. 13) longer 

 than club or funicle ; club 1.74 times as long as wide, with two distinct, 

 setose sutures, first arcuate, second more strongly arcuate. 



Pronotum 1.16 times as long as wide, widest near middle, posterior 

 outline feebly arcuate, posterior angles scarcely rounded; sides very 

 feebly arcuate from base to faint constriction anterior to middle, 

 broadly rounded in front, with anterior margin not regularly serrate ; 

 anterior area with broad, low asperities and short, stout, cinereous 

 bristles ; summit moderate, slightly in front of middle ; posterior area 

 horizontal, its surface subopaque, distinctly reticulate, with rather 

 sparse, very fine and shallow punctures and short, rather fine bristles 

 on disk, somewhat longer on sides. 



Elytra equal in width to pronotum and 1.67 times as long, 1.85 times 

 as long as wide; sides subparallel on more than basal three-fourths, 

 moderately broadly rounded behind; strial punctures deep, close, of 



