166 
Psyche 
[August 
Males. 
Mandibles and labrum yellow, 2 . 
Mandibles and labrum black; apical joints of tarsi blackish; 
6-7mm 1. 
1. Mesonotum coarsely reticulated; wings clouded beyond 
middle; broad bases of middle and hind tibiae yellow; 
July 29 — Aug. 22, rugosus. 
Mesonotum shining, sparsely punctured; wings hyaline; 
middle and hind knees yellow; June 11 — Sept. S, albitarsis. 
2. Enclosure of labrum slightly narrowed towards apex, 4 . 
Enclosure of labrum strongly narrowed and subbidentate 
at apex; middle joints of flagellum fulvous beneath, 3. 
3. Metathorax shining, impunctate; tubercles yellow; hind 
tibiae broadly yellow at base; 5-6mm; Aug. 1-30 labrosus. 
Metathorax punctured behind; tubercles black; hind knees 
yellow; 4-5mm; Aug. 3 — Sept. 8, labrosiformis. 
4. Middle of clypeus concave, impunctate; tubercles and 
middle and hind knees yellow; 5-7mm; Aug. 3 — Sept. 7, 
rudbeckiae. 
Middle of clypeus convex, punctate, 5. 
5. Mesonotum opaque, with large dense shallow punctures, 
closely pubescent; antennae long; face below antennae, 
and tibiae, except spot beneath, yellow; 5-6mm; Aug — 
28 — Oct. 4, compositarum. 
Mesonotum more shining, the pubescence short or sparse, 6. 
6. Hind tibiae yellow at least on basal third; tubercles yellow; 
mesonotum finely punctured, not trisulcate; 5-6mm; Aug. 
23 — Oct. 21, asteris. 
Hind tibiae yellow at extreme base; tubercles black; 
mesonotum coarsely punctured, trisulcate; 4-6mm; Aug. 
12— Sept. 7, solidaginis. 
PHENOLOGY. — Of the dominant families of bees the 
Panurgidae have the most definite phenological position. They 
fly from May 28 to October 29, all of them together August 30 — 
September 3. 
