As in _californicum_ but the scutellum finely punctate differs from _acmaeoderae_ in being more robust, the first and third femora are not metallic ventrad, the costal cell is broader, the tip of the fore wing is hyaline for a short distance. _alpinum_ Girault Legs wholly concolorous except the knees and tips of tibiae narrowly and the tarsi; as in the preceding but stylus and ovipositor subequal. _cyaneum_ Ashmead 3. Wings hyaline or subhyaline. Antennæ concolorous except at extreme base. Ovipositor extruded for about half the length of the abdomen, the stylus slightly short. Middle legs except coxae, all knees narrowly, tips of tibiae and the tarsi reddish brown. Postmarginal vein subequal to the stigmal. _hubbardii_ Ashmead Ovipositor extruded for less (or not more) than a third the length of the abdomen, the stylus subequal. Postmarginal vein subequal to the stigmal. Legs reddish except the coxae and cephalic femora and tibiae. Scutellum somewhat more distinctly lineolated longitudinally, punctate. Ovipositor short. _hyalinipenne_ Ashmead Postmarginal vein distinctly longer than the stigmal. Legs concolorous except knees, tips of tibiae and the tarsi. Stylus somewhat shorter than the ovipositor which is a third the length of the abdomen. _georgia_ Girault 4. Wings subhyaline. Antennæ with the basal fourth of the cape honey yellow. Postmarginal vein distinctly much longer than the stigmal, twice longer. Ovipositor extruded for nearly half the length of the abdomen, the stylus a little shorter. Legs honey yellow except fore and hind coxae. _arizona_ Girault All the species have the postmarginal vein shorter than the stigmal or no longer, save where noted; the parapsidal furrows are distinct, but very short, joining before the middle of the scutum from cephalad. The club is usually single, the antennae 11-jointed, tapering-filiform. _Dialinus begini_ Crawford One female, Santa Clara County (C. F. Baker). _Elachistus coxalis_ Howard One pair, San Mateo County, California, the male; and Laguna Beach, Southern California, the female (C. F. Baker). The following species is an _Eudecatoma_ (there being no distinct substigmal spot but only a very minute one) but for the present I include this segregate within the older one. _Decatoma subimmaculata_ n. sp. _Female_: Length, 2.00 mm. Of the usual habitus and sculpture, the punctation not coarse.