ART. 17 NORTH AMERICAN WEEVILS — -PIERCE 25 



TABLE OP NORTH AMERICAN SPECIES OF PSEUDANTHRIBDS 



The following table is from Schaeffer (1904) : 



1. Pubescence of thorax and elytra uniform, dense, yellowish gray, without 



erect tufts of scales lividus LeConte. 



Pubescence grayish white, yellow and brown forming denser brush-like tufts 

 on thorax and elytra 2. 



2. Elytra with basal fascia or spot 3. 



Elytra without basal fascia or spot 5. 



3. Elytra with a well-defined large transverse white spot in front of middle 



not extending to the side margin cornutus Say. 



Elytra with more or Less distinct fascia of dense white or ochreous hairs ex- 

 tending to the side margin 4. 



4. Thorax without larger black spot near each hind angle, the middle and 



posterior tufts of hairs on the elytra more widely separated from each 

 other than the first and second, the line of denser white and yellowish 



hairs convergent in front vagus Horn. 



Thorax with one black spot each side near hind angles, the distance between 

 the first and second elytral tuft equal to that between the second and 

 third, the lines of whitish and ochreous hairs at apex of thorax divergent 

 in front bipunctatiis Schaeifer. 



5. Elytral tufts equidistant, middle thoracic tuft large and black, the arcuate 



lines convergent in front but very indistinctly defined at apex. 



penicellatus Schaeffer. 



coarser near base where the thin interstices show a marked tendencj' to assume a 

 transverse arrangement ; antennae heavy, equal to or one-half longer than body in 

 male, of normal length in female. 



Male. — Eighth segment of antenna much longer than ninth, generally equal to, or 

 longer than, entire club, the latter with its segments obliquely emarginate and 

 somewhat asymmetric; mid-tibia a little more abruptly expanded internally at apex 

 than in female, but without apical spine. In a few specimens a feeble longitudinal 

 carina is present on middle of first abdominal segment. 



Female.- — Antennae somewhat more than half as long as body, the eighth segment 

 subequal to or slightly shorter than ninth ; club relatively broader, its segments 

 obliquely emarginate. 



Length, 4.5 to 7 mm. Georgia, Mississippi, Kentucky, Illinois, Ohio, and 



Maryland plagifer Jordan. 



(dispar LeConte, not G.yllenhal). 

 la. Elytra without a discal area as above ; postscutellar carina present ; pronotum without 

 marked elevations (in mixtus and inoesttta a less prominent median one is some- 

 times developed) ; pronotal punctures very dense, nearly uniform in size and distri- 

 bution, the thin interstices forming a regular network and not transversely arranged 

 near base ; antennae much thinner, shorter than body in both sexes, eighth segment 



of normal length 2. 



2. Elytra with an extensive black discal area extending from base to declivity, covering 

 about five intervals on each elytron, broader at base, rarely with some paler mot- 

 tlings ; sides of elytra pale and more or less tessellated ; pronotum without eleva- 

 tions ; postscutellar carina (in the four specimens seen) feeble, developed for a short 

 distance at sides only. 



Male. — Middle tibia with its inner apical angle produced into a broad, flat spine ; 

 antennae about three-fourths as long as body, the eighth segment equal to ninth or 

 nearly so, the club broad, flattened, and with its segments obliquely emarginate. 



Female. — Antennae a little shorter, eighth segment shorter than ninth, tenth seg- 

 ment relatively longer than in male ; club narrower and less flattened, and with its 

 segments evenly emarginate. 



Four specimens seen : One male paratype from Wingina, Va. ; one female. Baton 

 Rouge, La. (O. W. Rosewall) ; one female, Cupids Bower Island, Md. (R. C. 

 Shannon) ; one female, Tampa, Fla. (Hubbard and Schwarz) virginicus Leng. 



