Genus MASTOGENIUS Solier 1849 [Biogeographical Regions AFR AUS NEA NEO ORI PAL ]
Mastogenius Solier 1849:507.
   Type species: Mastogenius parallelus Solier 1849 (fixed by original designation).
Haplostethus LeConte 1860b:253.
   Type species: Haplostethus subcyaneus LeConte 1860 (fixed by monotypy).

aeneus Kerremans 1897a:47.
aliciae Westcott 2005b:40.
arizonicus Bellamy 2002b:2.
barrigai Moore 1994a:121.
castlei Champlain & Knull 1922b:145.
         syn. antennatus Cazier 1952:6.
cedralensis Manley 1987b:2.
changonensis Manley 1986b:229.
eruleus Obenberger 1939l:80.
coyolensis Manley 1987b:3.
crenulatus Knull 1934c:334.
         syn. knulli Obenberger 1939k:79.
cuneaticollis Van Dyke 1953a:58.
cyanelytron Westcott 2008:50.
         unvn. cyanelytra Westcott 2005b:41.
cyaneous Fisher 1922b:94.
         syn. bordoni Cobos 1981a:78.
elinarae Manley 1986b:223.
galapagoensis Van Dyke 1953a:57.
guayasensis Manley 1986b:225.
guayllabambensis MacRae 2003a:149.
howdenorum Manley 1990:213.
impressipennis Fall 1906:165.
insperatus Kurosawa 1972:617.
jipijapa Manley 1986b:229.
laevifrons Germain & Kerremans 1906:394.
lizaleriae Moore 1998:61.
manglaraltoensis Manley 1986b:226.
martinezi Cobos 1956b:208.
pacacua Manley 1987b:1.
parallelus Solier 1849:508.
peruvianus Fisher 1949:350.
primaevus Obenberger 1957c:309. (fossil)
proximus Cobos 1981a:80.
puncticollis Schaeffer 1919a:213.
relictus Bílý 1979a:216.
reticulicollis Cobos 1981a:82.
robustus Schaeffer 1905b:148.
simulans Cobos 1981a:79.
solieri Thomson 1878b:91.
subcyaneus (LeConte) 1860b:254 (Haplostethus).
sulcicollis Philippi in Philippi & Philippi 1864b:315.
         syn. penai Cobos 1956b:216.
taoi (Tôyama) 1983:58 (Haplostethus).
testaceipes Obenberger 1941j:58.
texanus Bellamy 2002b:4.