Arpediothrips mojave Hood, 1927 is a terebrantian thrips that lives between tightlyclustered leaves at the center of leaf rosettes on Yucca (Agavaceae) plants in the Mojave Desert of North America. Wings on both sexes have been described as present or absent and as macropterous or brachypterous. I examined the wings, lengths of pronota, and pterothoracic muscles of A. mojave collected from Yucca schidigera Roezl ex Ortgies leaf clusters and caught in flight-interception traps to determine if brachypters are dealated macropters. Female and male brachypters lacked the forewings observed on macropters but retained the forewing axillary sclerites, and their hind wings appeared torn-off at approximately one-fourth their length. Pronota on female and male brachypters were longer than those on macropters in traps but did not differ in length in females, and were slightly and non-significantly longer in males, compared with pronota on macropters in leaf clusters. Dorsal longitudinal muscles within the mesothorax and metathorax were visible in all macropters caught in traps and most macropters collected from leaf clusters but absent in nearly all brachypters. Short-winged A. mojave females and males appear to be nondispersing macropters that have dealated and histolyzed their flight muscles.
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Vol. 92 • No. 3