Studies of North American Bees 77 



. Subgenus Holonomada Robertson, 1903. 



KEY TO THE NEBRASKA SPECIES 



Females 



Sides of the propodeum above with prominent projecting angles; propo- 



deum wholly black ; vernal species i 



Sides of the propodeum not at all angulated ; propodeum black or with 



two 3-ellow patches or spots ; autumnal species 2 



I. Mesopleura and mesoscutum black; tubercles and tegulae yellow. 



Posterior orbits with a yellow band ; lateral face marks, face in 



front, clypeus above, labrum, mandibles except tips, nieso- 



pleural spots, mesoscutellum and most of tibiae and tarsi, 



usually yellow; broad complete yellow bands on tergites 1-5; 



11-13 mm supcrba 



Posterior orbits black; most of facial ornaments, scape in front, 

 mesopleural spots, mesoscutellum and legs red; band on tergite 

 I red with yellow oval lateral spots, those on 2 and 3 narrowly 

 medially interrupted, on 4 and S complete; 8.5 mm. 



superba var. 

 I. Mesopleura and mesoscutum, except for a broad median and feeble 

 lateral lines and anterior and posterior margins, which are 

 black, red, the tubercles and tegulae also red ; lateral face marks, 

 whole of antennae, clypeus, labrum, mandibles except tips, 

 postorbital line, collar, mesoscutellum, line on metanotum. legs 

 and most of venter, red; broad complete yellow bands on ter- 

 gites 1-5 ; 10.5 mm nebrascensis 



2. Abdominal tergite i black or with a reddish stain, 2^3 with interrupted, 

 4-5 with complete yellow bands; propodeum black or slightly 

 stained with red apically, without yellow spots ; smaller, 7-7.5 mm. 



placid a 

 2. Abdominal tergites 1-5 with complete yellow bands, those on 1-3 gradu- 

 ally constricted medially but not interrupted except that the 

 band on i is rarely so; propodeum with large yellow spots on 



the sides ; larger, 8-11.5 mm 3 



3. Mesoscutum black, often with reddish sides; eastern species; 



8-11.5 mm v'mcia 



3. Mesoscutum usually red, at least laterally, sometimes black; west- 

 ern species ; 9 mm zehrata 



(The female of superba uiahastri is unknown or unrecognized). 



Males 



Sides of the propodeum above with prominent projecting angles; meso- 

 scutellum more strongly bilobate ; vernal species i 



77 



