CHARLES W. METZ. 117 



Genitalia. — Armature very large and stout ; cardo unusually long 

 and heavy, narrowing to a rounded tip; stipes stout, superior lobe 

 small, not curving in abruptly at distal end, only extending about one- 

 third the length of stipes ; apical portion stout, rounded, heavily 

 haired ; sagittal rods not peculiar, reaching to end of stipites ; volsella 

 normal, (fig. 18). Seventh ventral plate with triangular wings, outer 

 margin of each somewhat concave ; no distinct lobes basally or api- 

 cally ; tooth-like processes very long, slender, and curved ; membran- 

 ous flap typical of the group, (fig. 43). Eighth ventral plate very dis- 

 tinct from preceding species ; distal pedicel rather long, ending in two 

 lobe-like flaps, sparsely haired, (fig. 46). When viewed laterally this 

 plate shows a rounded notch near apex, (fig. 47). A similar notch is 

 found in the species riidbeckicp, etc., but is not so conspicuous. 



Female. — Not known, or indistinguishable ; probably one of the 

 forms that have not yet been associated with their males. 



Habitat. — Not very well known ; the Baker collection in- 

 cludes specimens from Colo., N. M., Calif, and Cana. 



Specimens examined : 12 males. The description is based 

 upon a specimen (probably cotype) sent by Professor Cock- 

 erell from Colorado. 



This is a very distinct, well marked species, both in ex- 

 ternal and in genital characters. It is nearest related to the 

 following, but quite unlike it in many respects. In punctura- 

 tion it greatly resembles P. episcopalis Ckll., but is entirely 

 different in other characters. From the small series at hand 

 there appears to be little variation in the species, but more 

 material may prove the contrary. The only variation notice- 

 able, aside from size, is in the basal width of the clypeus, 

 which varies from the typical, (fig. 86), to forms in which 

 it is about one and a half times the width of the lateral 

 area. 



P. tridens Ckll. unquestionably belongs to this species if 

 the description given for it is characteristic. The differences 

 were given as being somewhat more dense puncturation of 

 the first abdominal segment, 1 mm. difference in length, and 

 other equally variable characters. I have the lots from which 

 these were described and find only the one species. Five of 

 these have been dissected and are identical in genitalia, as 

 described. 



TRANS. AM. ENT. SOC, XXXVII. (*15) 



