THE CANADIAN ENTOMOLOGIST. 28; 



1. Border of segment i hardly wider on the sides ; fascia on sides of 2 



abruptly produced forward ; mesonotum bilineate ; apex of 



pygidium convex 6. 



Border of segment i much wider on the sides 2. 



2. Mesonotum bilineate ; pygidium longitudinally carinate 4. 



Mesonotum with a subcordate completely enclosed space; black. . .3. 



3. Fascise continuous except on base of segment i, abruptly widened on 



sides of 2 ; space on mesonotum hardly trilobed ; patch on 

 pleura subquadrate ; scutel flat, spines nearly obsolete ; 



14-16 mm Nevadensis. 



Fasci?e interrupted on segments 1-2, gradually widening on sides of 2 ; 

 space on mesonotum trilobed ; patch on pleura L-shaped ; scutel 

 sub-bilobed, spines distinct; 10-14 nim remigatus. 



4. Segment 5 shining, rather coarsely punctured, apex concave, bevelled 



space and lateral pubescent patches indistinct ; apex of pygidium 

 truncate ; scutel rather strongly bilobed ; black, labrum, middle 

 of mandibles, tegulae, tibiae and tarsi tinged with red ; segment i 

 with transverse subquadrate patch, the apical fascia interrupted or 

 continuous ; fasciae on 2-4 continuous, paler on 4 ; lunate patch 

 on pleura separated from patch surrounding tubercle ; ventral 



fascise none ; 13 mm.; sp. nov simplex. 



Segment 5 opaque, densely punctured, apex convex, bevelled space 

 always and lateral pubescent patches usually distinct ; apex of 

 pygidium convex ; scutel less bilobed : patch on segment i 

 usually triangular; fasciae on 1-2 interrupted, 3-4 continuous, 

 that on 4 of the same colour; lunate patch on pleura usually con- 

 nected with patch surrounding tubercles ; ventral segments 2-4 

 with apical fascise 5. 



5. Labrum, mandibles, joints 1-3, tegulse and legs red; 



11-12 mm lunatus. 



Labrum, mandibles, joints 1-3, tegulse and legs black ; 



10-13 mm concolor. 



6. Ornaments cinereous ; fascia on segment i, and sometimes on 2, 



interrupted; black; closely punctured; 11-12 mm . . . .donatus. 

 Ornaments cream colour ; legs usually red 7, 



7. Pectus coarsely and sparsely punctured ; mandibles, labrum, joints 1-3 



and tegulse sometimes tinged with red ; fascia on segment i, and 



sometimes on 2, interrupted ; 8-1 1 mm pectoralis. 



Pectus finely and closely punctured 8. 



