Theme: Trick or Treat - Or give us something crunchy to eat. We find we've gotten four entries with a decidedly crunchy finish.
17. Computer storage medium : MEMORY CHIP
24. Quick-on-the-uptake type, in slang : SMART COOKIE
37. Carton-cushioning unit : STYROFOAM PEANUT
46. Showy authority figure : WHIP-CRACKER
58. Tense pre-deadline period ... or when to eat the ends of 17-, 24-, 37- and 46-Across? : CRUNCH TIME
BOO! Argyle here. What was (or is) your favorite Halloween treat? This grid has rectangles in two corners and a triangular shape in the other two. A gridspanner in the middle. It reminds me of a candy bar. I'll share it with you. (BTW, there are some more crunches in the puzzle.)
1. Forget where one put, as keys : MISLAY
7. Pedro's eye : OJO. Spanish.
10. Golf great Ballesteros : SEVE. Also Spanish.
14. Crumbly Italian cheese : ASIAGO. Aged Asiago cheese resembles Parmesan cheese in flavor.
15. Lao Tzu's "path" : TAO
16. Slangy prefix meaning "ultra" : ÜBER
19. When repeated, island near Tahiti : BORA. Northeast of New Zealand.
20. Male sibs : BROs
21. Kadett automaker : OPEL. Produced between 1937 and 1940, and 1962 until 1991.
22. Apple music players : iPODs
23. Vintner's prefix : OEN. Oenophile - a connoisseur of wines. 58D. French vineyard : CRU
26. Athenian walkway : STOA
28. Otherwise : ELSE
29. Persian rulers : SHAHs
31. Irene of "Fame" : CARA
33. Used-up pencils : NUBS
40. Latin being : ESSE
41. Latin love word : AMAS. Amo, Amas, Amat.
42. Muslim pilgrim's destination : MECCA
43. Tombstone lawman Wyatt : EARP
45. Mischievous trick : DIDO. More often clued as the Queen of Carthage. There is a singer so named, also.
51. Facebook notes, briefly : IMs. Chat with Instant Messaging.
54. Put back to zero : RESET
55. Orator's place : DAIS
56. Vivacity : ELAN
57. Fitzgerald of jazz : ELLA
60. Bedframe part : SLAT
61. Notes after dos : REs. On a different note from 51-Across.
62. Pop singer Spector who fronted a '60s girl group named for her : RONNIE
63. Alley prowlers : TOMs Cats
64. Function : USE
65. Chuck who broke the sound barrier : YEAGER. Some tidbits I didn't know. WIKI
1. Up-tempo Caribbean dance : MAMBO
2. River of Grenoble : ISÈRE. France.
3. Kids' imitation game : SIMON SAYS
4. Vietnam neighbor : LAOS
5. Part of USDA: Abbr. : AGRiculture
6. Multiple Grammy-winning cellist : YOYO MA
7. Catchall option in a survey question : OTHER
8. They're related to the severity of the crimes : JAIL TERMS
9. Caveman Alley : OOP. Administered justice with a club.
10. Summoned as a witness : SUBPOENAED
11. Novel on a small screen, perhaps : E-BOOK
12. "Falstaff" was his last opera : VERDI
13. Wipe clean : ERASE
18. Tax pro: Abbr. : CPA. Have you noticed sometimes CPA isn't indicated as an abbr.?
22. Cyclades island : IOS
24. Nothing to write home about : SO SO
25. Applaud : CLAP
27. Feats like the Yankees' 1998, '99 and 2000 World Series wins : THREE-PEATs
29. Opposite of NNW : SSE
30. 6'3", 5'4", etc.: Abbr. : HTs. (height)
31. Close associates : COMPADRES. From Spanish.
32. Roadside assistance org. : AAA
34. Preparing to use, as a hose : UNCOILING
35. Tampa Bay NFLer : BUC
36. RR stop : STAtion.
38. Jamie of "M*A*S*H" : FARR. Cpl. Klinger.
39. Arabian leader : EMIR
44. Play a part : ACT
45. Discern : DESCRY
46. Take by force : WREST
47. "Is anybody here?" : "HELLO?"
48. Quran religion : ISLAM
49. Underlying reason : CAUSE
50. Relatives : KIN
52. Mrs. Eisenhower : MAMIE. The First Lady, 1953 to 1961.
53. Snide smile : SNEER
56. Sicilian volcano : ETNA
59. Earth chopper : HOE