March, 1904.] TiTUS : NOTES ON OSMIIN^E. 23 



with last dorsal segment (7), rounded, entire, with a faint trace of lateral angles, 

 first ventral segment with a slight transverse swelling, second and third broad, second 

 with lateral marginal swellings, third sinuate marginally, sides of abdomen very 

 parallel. 



Type of genus the following species : 



Robertsonella gleasoni, new species. 



9. Length 5.5 mm. Black, shining, finely and rather coarsely punctured ; 

 pubescence glistening silvery white, short and not thick on face, cheeks and man- 

 dibles with a fringe of longer hairs, sparse on thorax above, denser and longer on 

 pleura, very short and sparse on abdomen, segments i to 5 with a narrow appressed 

 apical fringe, interrupted (or rubbed), on segments I and 2, sixth segment densely 

 clothed with short suberect hairs, ventral scopa dense and white, extending well up 

 along sides of abdomen ; femora and tibia with sparse white hair and tarsi with dense 

 slightly embrowned pubescence beneath on first joint, remaining joints moderately 

 pubescent; tibial spurs pale ; middle tibia not as long as first joint of corresponding 

 tarsi. 



$. Length 5 to 5.5 mm. Closely resembles female; punctures of head finer 

 and closer, pubesence of face white, dense, appressed, that of clypeus long, very 

 dense and snowy-white, slightly discolored at apical margin, hair fringing cheeks and 

 mandibles longer and moderately dense ; antennse reaching beyond tegulae ; scutel- 

 lum and metathorax with more pubescence than in female, abdominal segments I to 

 3 fasciate only at sides, 4 to 6 fasciate, fourth with white pubescence on disc ; sev- 

 enth segment slightly flattened, apex of sixth slightly reflexed ; third ventral with a 

 median apical patch of white hair. 



Several specimens on Phacelia purshii at Grand Tower, Illinois, 

 9 May, 1902, by H. A. Gleason. i 9 and i $ deposited in U. S. 

 National Museum. 



Type.—^o. 6858. 



Genus HERIADES Spinola, 1808. 



Type: Heriades iruncorum (Linne) X758.. 



So far as I have been able to find, Spinola designated no species 

 as the type of his genus; however, in 1810, Latreille distinctly desig- 

 nates the above species as the type of Heriades (Consid. Gen. sur 

 rOrdre Naturel des Animaux, p. 439). Schenck in 1859 created for 

 If. trunconim the genus Trypetes. This generic name was not ad- 

 missible, since in 1836 Schonherr had used it for a coleopterous genus. 



Hence Robertson's Trypetini and Trypetoidea will not stand and, 

 for the tribal name, I propose Heriadini. 



Our Heriades carinatinn Cresson is congeneric with H. trimcoriim 

 Linne, as also is the following species. 



