26 PROCEEDINGS OF THE NATIONAL, MUSEUM vol. 79 



coarsely strigose, polished, malar space finely strigose, face to oral 

 region inconspicuously reticulate-umbilicate punctate; scape about 

 five times as long as its maximum thickness, pedicel almost a fifth 

 longer than Fl, this joint only slightly longer than F2, F2 barely 

 longer than F3, F4, and F5, and slightly longer than broad, the other 

 funiculars as broad as long, or F5 a bit broader than long, club rela- 

 tively short and thick ; head one-sixth wider than pronotum, width of 

 mesothorax intermediate, but nearer that of head ; nota of prothorax 

 and mesothorax umbilicately punctate, the interior part of latter 

 finely wrinkled as usual where overlapped by hind portion of pro- 

 notum, inesopleura aciculate, the posterior half less conspicuously on 

 posterior two-thirds ; anterior carina of propodeal furrow forming a 

 moderately diverging U, furrow bottom with several broken, crooked 

 rugae, lateral and anterior faces of propodeum distinctly reticulate, 

 mesal portion le§s so; submarginal vein with a row of 11 setae (one 

 specimen) ; abdomen mostly bare, moderately hairy behind, surface 

 highly polished, unsculptured, glassy transparent. 



Male. — 2.3 to 2.4 mm, long, colored like female, mesal surfaces of 

 propodeum as reticulated as lateral surfaces, submarginal vein bear- 

 ing a row of 9 to 11 setae, sculpturing and vestiture as in female, di- 

 mensions of head the same ; scape five times as long as greatest diam- 

 eter near base, pedicel, one-fifth longer than Fl, latter one-eighth 

 longer than each of F2. F3, and F4, each of these two-sevenths longer 

 than broad, club three times longer than broad, and as long as F4, 

 F3, and a fourth of F2 combined. 



Type locality. — Huachuca Mountains, Ariz. 



Type.— Male, U.S.N.M. No. 42241. 



Beside the type, there are at hand the female allotype and one 

 male paratype, the latter two in the writer's collection. All the 

 material was received from Lewis H. Weld, who reared it from a 

 woody stem gall on Mimosa hiuncifera. The pins bear Weld's record 

 number 375. 



9. DEC ATOM A NUBILISTIGMA Walsh 



Plate 1, Figtjke 7 



Decatoma nubilistigma Walsh, Amer. Ent. and Bot., vol. 2, no. 10. p. 301, 1870. 



Resembles D. -flava Ashmead somewhat in length, size of head, in 

 the number of setae on the submarginal vein, and in being largely 

 yellow. D. nubilistigma has the head, vertex, prescutum, scutel, and 

 propodeum more or less black, a somewhat smaller wing band, and 

 the yellow of the body is a lighter shade than in flava^ which is almost 

 entirely yellow of a golden hue. 



Female. — Length 2.5 to 2.8 mm., colors various shades of yellow 

 and black; head greatly variable from entirely ochreous-yellow, ex- 



