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Two names, previously used to designate subspecies of Calliopsis (Hypomacrotera) callops, are herein used to refer to distinct species: C. (H.) callops (Cockerell & Porter) and C. (H.) persimilis (Cockerell). These two species are described and the data on floral host association and distributions are listed and illustrated. These two species, plus Calliopsis (Hypomacrotera) subalpinus Cockerell, comprise the monophyletic subgenus Hypomacrotera. Floral association and distribution data from over 850 specimens are analyzed. Calliopsis callops and C. persimilis are oligolectric on a group of closely related genera in the family Solanaceae; the former on Chamaesaracha and Quincula and the latter on Physalis. Calliopsis subalpinus is clearly oligolectic on mallows in the genus Sphaeralcea. Calliopsis persimilis and C. callops are parapatric with a narrow region of overlap in the San Simon Valley, near the Continental Divide in southern Arizona. Calliopsis subalpinus ranges widely across the southwestern deserts from southern California to southwestern Texas and southward to northern Mexico.