228 SEVENTEENTH Report STATE ENTOMOLOGIST OF MINNESOTA—1918 
observed, covering only one square rod of ground, that included several 
thousand nests. The sexes are different in appearance and are rarely 
found together. The cells are stored with pollen and honey. 
Minnesota species: 
Andrena imitatrix 
claytoniae Rob., A. 
(A.) — erythrogaster 
Ashm., A. (A.) dun- 
ningt Ckll. A. (A.) 
carlimt Ckll. A. (A.) 
bisaheis  VierS eae 
(A.) robertsom D. T., 
A. (A.) commoda 
Fig. 117. Andrena (A.) mariae Rob., female with 2d Sm., A. (G28) sigiae 
Eeecha Gee on left and enclosure on Rob.., Jl (A.) mariae 
Rob., A. (A.) flavo- 
clypeata Sm.,A.( Tra- 
chandrena hippotes 
Rob., A. (Trachan- 
drena) crataegi Rob., 
A. (A.) placida Sm., 
A. (A.) nubecula Sm. 
(on goldenrod and 
aster, Martinand Rock 
counties “im, Séept.); 
A. (A.) canadensis 
Prov., A..\( A.) fragt 
hs Sm,, A. (A.) lir- 
ticincta Prov., AL Fig. 118. Andrena (T.) crataegi Rob., female. 
(A.) cressoni Rob., 
A. (Pterandrena) helianthi Rob. (on aster, Martin and Itasca counties 
in Sept.), A. (P.) asteris Rob. 
DUFOUREIDAE 
Females and most males with a flat triangular area on apical dorsal abdominal 
segment; clypeus hardly protuberant, labrum concealed except at base, posterior an- 
gle of mandible not in front of posterior margin of eye; tongue acute, flat, rarely 
filiform; labrum free from mandibles and as large as clypeus. 
Halictoides (Conohalictoides) novaeangliae Rob. is found in this 
state. Visits flowers of pickerel weed. 
