========================================================================== |Nights of observation| Hours of observation| OBSERVATION STATION |---------------------+---------------------|Season |March|April|May|Total|March|April|May|Total|density ---------------------+-----+-----+---+-----+-----+-----+---+-----+-------- CANADA | | | | | | | | | Pt. Pelee | | | 1 | 1 | | | 6 | 6 | 2,500 | | | | | | | | | MEXICO | | | | | | | | | S. L. P.: Ebano | 1 | | | 1 | 3 | | | 3 | 1,300 Tamps.: Tampico | 3 | 3 | | 6 | 20 | 20 | | 40 | 140,300 Yuc.: Progreso | | 3 | | 3 | | 18 | | 18 | 60,500 | | | | | | | | | UNITED STATES | | | | | | | | | Fla.: Pensacola | | 2 | 2 | 4 | | 8 | 7 | 15 | 1,500 Winter Park | | 5 | 6 | 11 | | 39 |38 | 77 | 21,700 Ga.: Athens | | 2 | | 2 | | 10 | | 10 | 4,000 Thomasville | | 1 | 1 | 2 | | 8 | 8 | 16 | 4,700 Iowa: Ottumwa | | 5 | 5 | 10 | | 16 |28 | 44 | 134,400 Kans.: Lawrence | 2 | 1 | | 3 | 16 | 4 | | 20 | 68,700 Ky.: Louisville | | 3 | 2 | 5 | | 20 |14 | 34 | 49,300 Murray | | 2 | | 2 | | 13 | | 13 | 26,200 La.: Baton Rouge | | 3 | | 3 | | 15 | | 15 | 11,000 Lafayette | | 1 | | 1 | | 5 | | 5 | 2,800 Mansfield | 1 | 5 | 4 | 10 | 2 | 16 |22 | 40 | 22,400 New Orleans | 1 | 1 | | 2 | 5 | 2 | | 7 | 1,900 Oak Grove | | 2 | 2 | 4 | | 16 |15 | 31 | 33,900 Mich.: Albion | | 1 | | 1 | | 3 | | 3 | 1,100 Minn.: Hopkins | | | 1 | 1 | | | 4 | 4 | 2,000 Miss.: Rosedale | | 1 | 1 | 2 | | 6 | 8 | 14 | 12,600 Mo.: Columbia | | 2 | 1 | 3 | | 8 | 6 | 14 | 13,100 Liberty | | 1 | 1 | 2 | | 7 | 7 | 14 | 4,800 Okla.: Stillwater | 1 | 2 | 1 | 4 | 5 | 11 | 3 | 19 | 8,400 S. Car.: Charleston| 1 | 1 | 1 | 3 | 5 | 8 | 9 | 22 | 3,000 Tenn.: Knoxville | | 2 | 2 | 4 | | 18 |14 | 32 | 35,400 Memphis | 2 | 3 | 2 | 7 | 13 | 20 |12 | 45 | 29,700 Tex.: College | | 3 | 1 | 4 | | 19 | 8 | 27 | 32,200 Station Rockport | | 1 | | 1 | | 4 | | 4 | 6,200 --------------------------------------------------------------------------