166 Psyche [August 



Males. 



Mandibles and labriim yellow, 2 . 



Mandibles and labrum black; apical joints of tarsi blackish; 



6-7mm 1 . 



1. jNIesonotum coarsely reticulated; wings clouded be^-ond 



middle; broad bases of middle and hind tibiie yellow; 



July 29 — Aug. 22, rugosus. 



Mesonotum shining, sparsely punctured; wings hyaline; 



middle and hind knees yellow; June 11 — Sept. 8, 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. IMetathorax shining, impunctate; tubercles, yellow; hind 

 tibiae broadly yellow at base; 5-6mm; x\ug. 1-30 labrosus. 



Metathorax punctured behind; tubercles black; hind knees 

 yellow; 4-5mm; Aug. 3 — Sept. 8, labrosiformis. 



4. ]\liddle of clj^peus concave, impunctate; tubercles and 



middle and hind knees yellow; 5-7mm; Aug. 3 — Sept. 7, 



rudbeckiae. 

 ]\Iiddle 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 fineh^ 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. . 



