1938] 
Genus Macropis 
135 
marks extending above antennal sockets; hind tibial spurs 
not inserted beneath teeth 2 
— .Body much more sparsely punctate, punctures of abdomen 
separated by five or more times their diameters; length 
about 7 mm. Male: Middle metatarsus slender, parallel 
sided; lateral face marks not extending above antennal 
sockets 3 
2. Male: Outer surface of hind metatarsus polished be- 
tween the hairs ; punctures of hind tibiae larger, the surface 
between them smooth ; vertex shiny, with some fairly large, 
almost impunctate, smooth, areas. (East of Rocky Moun- 
tains) steironematis 6 
— .Male: Outer surface of hind metatarsus dull, minutely 
roughened ; vertex less shiny, with more punctures, the sur- 
face between them slightly roughened. Female: Unknown. 
(Washington State) steironematis opaca 
3. Male: Hind tibial spurs not arising from beneath teeth ; 
supraclypeal area black or with little yellow; lateral face 
marks reduced to short lines near sides of clypeus. Female: 
Pubescence of hind metatarsus largely black on outer side. 
morcei 7 
— .Male: One or both hind tibial spurs arising beneath a 
tooth ; supraclypeal area yellow ; lateral face marks occupy- 
ing entire space between clypeus and eye margin to a point 
above upper margin of clypeus. Female: Pubescence of 
hind metatarsus white 4 
4. Male: Outer hind tibial spur only arising beneath a 
tooth; lateral face marks ending about opposite middle of 
antennal sockets. Female: “Punctation, especially of 
scutel, sparse.” 8 9 ciliata Q 
— .Male: Each hind tibial spur arising beneath a tooth; 
lateral face marks truncated and ending below the level of 
antennal sockets. Female: “Punctation, especially of 
scutel, dense.” 8 patellata 10 
6 Robertson, 1891, Trans. Am. Ent. Soc., 18:63. 
7 Robertson, 1897, Trans. Acad. Sci. St. Louis, 7:338. 
8 Viereck, 1916, Hym. Connecticut, p. 720. 
9 Patton, 1880, Ent. Mon. Mag., 17:31. 
10 Patton, 1880, Ent. Mon. Mag., 17:33. 
