Proceedings of the United States National Museum . Figure 16.—Comparison of frequency of occurrence of certain measurements in adultfemale P. mexicanus (solid symbols) and P. t. australis (open symbols), including allmeasurable individuals studied. MONTANA S OKLAHOMA VIRGINIA WASHINGTONOREGON ;! kansas west virginianorthern 3CENTRAL |END, ARIZONA <AS ARKANSAS - T T [j|l5_ m 3 j n ^- yn ^ T A —. MALE FEMALE ¥ NUMBER OF SPECIMENS IN SAMPLEOBSERVED RANGEOBSERVED MEAN 2 STANDARD ERRORS dEITHER SIDE OF MEAIj - -• — 2 STANDARD DEVIA

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Proceedings of the United States National Museum . Figure 16.—Comparison of frequency of occurrence of certain measurements in adultfemale P. mexicanus (solid symbols) and P. t. australis (open symbols), including allmeasurable individuals studied. MONTANA S OKLAHOMA VIRGINIA WASHINGTONOREGON ;! kansas west virginianorthern 3CENTRAL |END, ARIZONA <AS ARKANSAS - T T [j|l5_ m 3 j n ^- yn ^ T A —. MALE FEMALE ¥ NUMBER OF SPECIMENS IN SAMPLEOBSERVED RANGEOBSERVED MEAN 2 STANDARD ERRORS dEITHER SIDE OF MEAIj - -• — 2 STANDARD DEVIATIONON EITHER SIDE OF M^ LEGEND I Figure 17.—Gilecotus mexicanust. NA SOUTHERN ARizcna NORTHERN VALPARAISO MTS.,ZACATECAS SANTA ROSA, MEXICO GUANAJUATO MORE LOS OAXACA DURANSO OKLAHOMA VIRSINIA COAHUILA KANSAS WEST VIRGINIA NUEVO LEON

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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience