72 Myron Harmon Sivenk 



Bursa bursa-pastoris, by F. C. Bishopp. The writer has before 

 him a female from Ute creek, Costilla county, Colorado, col- 

 lected at 9,000 feet by L. Bruner on June 27, 1907. This speci- 

 men is obviously conspecific with A^. alpha, but the erythrization 

 has not progressed so far as in the type. Compared with the 

 description oi N. alpha, our specimen differs as follows : The 

 mandibles except the black tips, the tegulae, a very broad trans- 

 verse band involving most of the mesopleura, the centers of the 

 red propodeal spots, the mesoscutellum (dully), spots on posterior 

 femora apically, on bases of posterior tibiae and apices of middle 

 tibiae, and whole of anterior tibiae within, yellow (these parts 

 are wholly or mostly red or reddish in the type of alpha, except 

 that the mesoscutellum is red suffused with yellowish) ; black 

 facial and ocellar patches smaller and wholly separated by a large 

 red area, the mesoscutum merely with a narrow median line (the 

 facial and ocellar patches are connected in the type of alpha, 

 forming a solid patch except for a red mark in front of median 

 ocellus, and the mesoscutum has a median and two lateral poorly 

 defined black stripes) ; and the large pyriform lateral marks 

 on tergites 2 and 3 are connected to form bands, barely so on 2 

 but very distinctly so on 3 (these separated by red in the type 

 of alpha, causing them to appear as widely interrupted bands). 

 These differences are sufficient to form a variety scarcely worthy 

 of a name but which may be fully characterized as follows: 



$. Length 8 mm. Red ; the clypeus, triangular lateral face marks 

 extending above level of insertion of antennae, scape in front, labrum, 

 mandibles except tips, very broad postorbital band nearly attaining the 

 summit of the eye, collar, tubercles, very broad transverse band involving 

 most of mesopleura, tegulae, large nearly coalesced spots on lobes of 

 mesoscutellum, elevated portions of metanotum, centers of large red spots 

 on sides of propodeum, stripes or spots on both faces of the femora at 

 least apically, anterior tibiae within, spots on apices of middle and bases 

 of posterior tibiae, lateral spots or bands on the sides of the otherwise 

 red first abdominal tergite, bands on tergites 2-5, those on 2 and 3 much 

 narrower toward middle anJ there all but interrupted, those on 4 and 

 5 uniformly broad, and ventral sternites 2-5 except the broadly smooth 

 rufo-testaceous apical margins of 2-4, all yellow and mostly brightly so. 

 Spots around bases of antennae extending very narrowly down in the 

 upper clypeal sutures and in the clypeal-supraclypeal suture so as to form 



72 



