Abdomen, T1-2, distance between pits in the longitudinal center of the tergites between the unpitted apical rim and the often often densely pitted basal area | Flight Season - Month - This is for reference only and includes ONLY the known months of capture - All species are scored for ALL these months, but this information gives you an indication of which species might be captured in each month - Because this is an uncommon group it will not be definitive on its own | Forewing, distance from the top of the 1st recurrent vein to the bottom of the 1st transcutibal vein | Head, the relation of length to width - Length measured from top of head to apex of clypeus - Width measured between the midpoints of the eye | Locality where the bee was collected in California - Note that these distributions may be incomplete pending further sampling, use with caution | Sex, number of antennal segments | State or province where bee was collected

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Number scored for a state is in green.
1. State or province where bee was collected

2AZ    16CA    2NV   
2. Locality where the bee was collected in California - Note that these distributions may be incomplete pending further sampling, use with caution

6In the Sierra Nevadas    10Widespread throughout the central and southern coastal regions, although it should be noted that M. dinoceps is CURRENTLY ONLY known from the San Bernardino Mountains   
3. Flight Season - Month - This is for reference only and includes ONLY the known months of capture - All species are scored for ALL these months, but this information gives you an indication of which species might be captured in each month - Because this is an uncommon group it will not be definitive on its own

163. III - March - M. ruficaudus    164. IV - April - M. chaenactidis, M. dinoceps, M. mojavensis, M. ruficaudus    165. V - May - M. altadenae, M. chaenactidis, M. dinoceps, M. grossus, M. mojavensis, M. ruficaudus    166. VI - June - M. dinoceps, M. grossus, M. linsleyi, M. quadriceps    167. VII - July - M. quadriceps   
4. Sex, number of antennal segments

8Female, 12    8Male, 13   
5. Head, the relation of length to width - Length measured from top of head to apex of clypeus - Width measured between the midpoints of the eye

2CLEARLY AND OBVIOUSLY longer than wide, rectangular, usually about 1.5x as long as it is wide    14The width and length of the head are roughly equal or with the length slightly greater than the width, often difficult to tell if one is greater than the other    8The width of the head greater than its length   



6. Forewing, distance from the top of the 1st recurrent vein to the bottom of the 1st transcutibal vein

8Long, over 3 vein widths apart    14Short, about 1-2 vein widths apart   
7. Abdomen, T1-2, distance between pits in the longitudinal center of the tergites between the unpitted apical rim and the often often densely pitted basal area

8Pitting dense, averaging under one pit diameter, the difference in the pit density in the basal and middle areas being slight if there is any    6Pitting moderate, averaging about one pit diameter, usually with a noticeable difference in pit density between the basal and middle areas of T1-T2    8Pitting sparse, averaging over one pit diameter and usually several, usually with a very significant difference in pit density between the basal and middle areas of T1-T2