NO. 2332. VARIOUS NEW SPECIES OF HYMENOPTERA—GJRJ OLT. 209 

 DECATOMA MICHIGANICA, new species. 



Female. — Length, 2.10 mm. 



Honey yellow, the fore wings with but a minute substigmal spot, 

 the body marked with black as follows: Ocellar area, upper occiput 

 (in the shape of a cresent at the vertex only), cephalic face of prono- 

 tum except laterad, a minute dot (one specimen) at meson of prono- 

 tum, cephalad; a triangular area from cephalic margin of scutum 

 (except far laterad) to middle, thence acuminately to distal margin, 

 caudal margin of pronotum across the meson, disk of scutellum in the 

 form of a miter (clavate and near its widest part-distad with acute, 

 toothlike lateral projections (one from each side); cephalic margin, 

 medial basin and spiracular line of propodeum, petiole and median 

 line of abdomen to middle of segment 6, very narrowly on 6, termi- 

 nating in a dot, more broadly elsewhere and spreading transversely at 

 the end of each segment (notably, the first three); pedicel above at 

 base black. Umbilicately punctate. Abdomen compressed, the 

 petiole twice longer than wide, segment 4 longest, 5 and 2 subequal; 

 abdomen glabrous. 



Basin of propodeum not large, with a single, foveate median channel 

 tlirough it. Pedicel twice longer than wide at apex, somewhat longer 

 than funicle 1. An elongate black spot from base, mesad, caudal 

 coxae. 



From two females. Agricultural College, IMichigan. 



Type.—Qeii. No. 20869, U.S.N.M. The specimens on tags. 



DECATOMA AUTUMNALIS, new species. 



Female. — Length, L45 mm. 



Honey yellow, the \vings hyaline, the head brownish, upper scrobes 

 the ocellar area, upper occiput, cephalic margin mesad and median 

 channel of propodeum, caudal tibiae dorsad except at apex, petiole 

 meson of segment 2 of abdomen to middle and caudal margin of seg- 

 ments 2-4, dorsal aspect, black. Abdomen compressed, segment 5 

 longest. Antennae brown. Other^\^se as in micMganica. 



From one female, Mountain View, California (E. H. Ehrhorn), 

 September. 



Type.—Ceit. No. 20870, U.S.N.M. The female on a tag. 



DECATOMA COMPRESSA, new species. 



Female. — Length, 2.45 mm. 



Dull honey yellow, the substigmal blotch subobsolete (Eudecatoma) , 

 the following parts black: Scape dorsad narrowly, pedicel above 

 (except at apex), ocellar area, upper occiput, face of pronotum, small 

 triangle at center, cephalic margin of the scutum, narrowly connected 

 with scutellum along the meson, cephalic margin and the median 

 181404— 21— Proe.N.M. vol. 58 14 



