| Diplotaxis cavifrons Moser, 1918 |
| Diplotaxis chiricahuae Fall, 1909 |
| Diplotaxis circulans Vaurie, 1960 |
| Diplotaxis clypeata Bates, 1887 |
| Diplotaxis commixta Vaurie, 1960 |
| Diplotaxis completa Cazier, 1940 |
| Diplotaxis concava Vaurie, 1960 |
| Diplotaxis confusa Fall, 1909 |
| Diplotaxis consentanea Bates, 1887 |
| Diplotaxis contracta Bates, 1888 |
| Diplotaxis convexilabrum Vaurie & Cazier, 1955 |
| Diplotaxis corbula Vaurie, 1960 |
| Diplotaxis coriacea Bates, 1888 |
| Diplotaxis corrosa Bates, 1888 |
| Diplotaxis corvina LeConte, 1856 |
| Diplotaxis costanera Vaurie, 1958 |
| Diplotaxis cribatella Bates, 1889 |
| Diplotaxis cribaticollis Blanchard, 1850 |
| Diplotaxis cribraticollis Blanchard, 1851 |
| Diplotaxis cribriceps Bates, 1889 |