Female, X. bicuspidariae vs X. timberlakei - Best differentiated by direct comparison with specimens | Male, X. bicuspidariae vs X. timberlakei | Sex, number of antennal segments | State or province where the specimen was collected

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Number scored for a state is in green.

1. State or province where the specimen was collected

4AZ    4CA    2NM    2NV   

2. Sex, number of antennal segments

2Female, 12    2Male, 13   

3. Female, X. bicuspidariae vs X. timberlakei - Best differentiated by direct comparison with specimens

1X. bicuspidariae - The head is usually slightly longer than broad - The integument of the abdomen is at least partially, but almost always primarily, reddened - In direct comparison, this species is smaller than X. timberlakei, usually around 10mm in length    1X. timberlakei - The head is usually slightly broader than long - The integument of the abdomen is primarily blackish, although in some areas it may appear to be a DARK reddish-brown - In direct comparison, this species is larger than X. bicuspidariae, usually around 13mm   

4. Male, X. bicuspidariae vs X. timberlakei

1X. bicuspidariae - On S4, the broad tip of the rear-directed, central projection that arises from the rim appears relatively flat or slightly convex, with the sides of the projection remaining roughly parallel as they travel to the rim of S4 - On S5, the lateral tips of the similarly rear-directed, central projection are more broadly rounded, lobe-like and without a defined point at the tip - In direct comparison, this species is smaller than X. timberlakei, usually around 10mm in length or slightly larger    1X. timberlakei - On S4, just before the tip of the central projection the sides angle inward such that each side has a slight lateral indent on either side of the tip of the projection such that the rim appears interrupted at the sides, with the sides of this projection clearly wider near the tip than at the base of the projection - On S5, the lateral tips of the central projection are pointed, appearing as acute angles usually around fifty degrees - In direct comparison, this species is larger than X. bicuspidariae, approaching 15mm in length