iio Myron Harmon Szvenk 



spots on base of mandibles, broad lines on posterior orbits, collar, tuber- 

 cles, large subcuneate spots on mesopleura, tegulae, lobes of mesoscutel- 

 lum united above, metanotum, spots on middle and posterior coxae, and 

 abdominal maculations, cream color or very pale yellow. Lower corners 

 of face, including lower edge of lateral face marks and whole of labrum, 

 more or less stained with red. Clypeus shining, sparsely and weakly 

 punctured, face and vertex strongly and closely punctured, mesoscutuni 

 shining and with coarse but quite separate punctures becoming sparse on 

 the disk. Antennae bright red, the flagellum obscurely dusky above 

 toward tip, joint 3 much exceeding 4. Legs red except for the yellow 

 coxal spots and more or less blackish on posterior femora behind and on 

 a subapical band on posterior tibiae which becomes broader behind. 

 Wings subhyaline, darkened at tips and about marginal cells, nervures 

 blackish, stigma red, basal nervure interstitial with transverso-medial nerv- 

 ure. Long and pale, very thin hair on cheeks, occiput, pleura, legs and 

 sides of venter of abdomen toward tip, the sides of the propodeum with 

 appressed sericeous hair. Abdomen blackish, more or less stained with 

 reddish on basal tergites, tergites 1-5 with continuous bands, broad and 

 slightly constricted medially on anterior margin on i, broad laterally but 

 much constricted medially on 2 and 3, notched medially on posterior 

 margin on 4 and 5, apical margins of 2-4 usually markedly testaceous. 

 Venter black, more or less extensively replaced by red, especially basally, 

 sternites 3 and 4 with narrowly interrupted pale yellow lines, broader 

 laterally. 



(j*. Length 6.5-7 rr\m. Similar to the ? but clypeus, supraclypeal mark 

 and broad lateral face marks, together covering all of the face nearly up 

 to level of antennae, clear pale yellow, the labrum and mandibles except 

 tips concolorous with face, the scape in front also shaded with yellow. 

 Apex distinctly notched. 



Type. — Lincoln, Nebraska, June 17, 1901, on Convolvulus 

 arvensis (J. C. Crawford), $. 



Allotype.— Type lot, J*. 



Paratypes. — Type lot, 3 ?, i J*. 



This handsome little bee is written as a subspecies of N. 

 vierccki Ckll., from which it differs chiefly in having the pro- 

 pleura, mesopleura and sides of the propodeum black or blackish 

 instead of red. There seems to be no structural differences be- 

 tween convolvnli and the type of vicrecki in the U. S. National 

 ]\Iuseum, and the specimen from Ladonia, Texas, collected on 

 Rudheckia, May 25, 1904, by F. C. Bishopp, which Cockerell has 

 referred to vierecki (see Proc. U. S. Nat. Mus., XXXIX, p. 651), 



no 



