520 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.6J. 



Type-locality. — Lexington, Kentucky. 

 Type.—Cat. No. 20256, U.S.N .M. 

 A single female. 



CREMASTUS (CREMASTUS) GRACILIPES, new species. 



Female. — Length 9 mm., antennae 5.5 mm., ovipositor 3.5 mm. 

 Allied to the three preceding species. Compared with longiventris 

 Cushman, it differs as follows: Head in front view more oval; eyes 

 less strongly divergent, fully as long as width of face; face rather 

 strongly elevated in middle, temples strongly rounded; malar space 

 slightly shorter than basal width of mandibles; foveo-ocular lino 

 about two-thirds as long as interfoveal line; clypeus broadly rounded 

 at apex, about two-thirds as long as interfoveal line. Thorax stouter, 

 propodeum extending barely beyond middle of coxae; thorax 

 throughout similarly but less strongly sculptured; notauli rather 

 strong anteriorly; sternauli weak; areola only about a half longer 

 than wide and about three-fifths as long as petiolar area; petiolar 

 area only distinctly rugose, others punctate to rugoso-punctate; legs 

 slender; radius arising from very near middle of stigma; second 

 abscissa of radius nearly straight; second recurrent distinctly, 

 though briefly, postf ureal; second discoidal cell nearly half as wide 

 at base as at apex; ncrvellus strongly antef ureal; mediclla entirely 

 obsolete before nervellus. Abdomen almost exactly twice as long as 

 head and thorax; petiole flattened above and with distinct dorso- 

 lateral carinae; second tergite about four times as long as wide at 

 base, considerably wider at apex, finely aciculate; ovipositor about 

 twice as long as first tergite. 



Rufo-testaceous with following paler and darker markings; man- 

 dibles, palpi, scape below, tegulae and wing bases, notauli, scutellum, 

 legs, except basal and apical annulations of hind tibiae and hind 

 tarsal joints, stramineous (no distinct orbital markings); antennae, 

 occiput, vertex and frons in middle, longitudinal spot on prescutima, 

 spot embracing region about scutellum and base of propodeum as in 

 longiventris, all tergites except at apex and at sides beyond second 

 black or piceous. 



Type-locality. — East Marsh, District of Columbia. 



Host. — Dicymolomia julianalis. 



Type.~C&t. No. 20257, U.S.N .M. 



One female reared from cattail by E. S. G. Titus, July 16, 1903. 



CREMASTUS (CREMASTUS) FERRUGINEUS Davis. 



Cremastus ferrugineus Davis, Trans. Amer. Ent. Soc, vol. 24, 1897, p. 364. 



A single female from southern Illinois agrees with the description 

 in uU respects except that the occipital black spot is obsolescent. 

 This snecimen was used in placing the species in the key. 





