12 PROCEEDINGS OF THE NATIONAL MUSEUM vor,. 79 



31. Head almost or quite twice as broad as long, a small black spot 



contiguous with each oci'llus, but these spots never confluent, 

 occiput narrowly black, body almost immaculate golden yel- 

 low, anterior surface and groove of propodeum, peduncle and 

 dorsum of abdomen, black, 11 or 12 setae on submarginal 



vein pezoniachoides (p. 69). 



Head about three-fifths as broad as long, 13 to 15 setae on 



submarginal vein 32. 



32. ()cellar area nut solid black, occiput narrowly black, head other- 



wise, and thorax almost, immaculate above and on sides, at 

 times a suggestion or a patch of darker color along median 



line subimmaculata (p. 60). 



Ocellar area usually solid black, black sometimes reaching 

 beyond ocelli on all sides, at least prescutum mostly black, 

 more often an irregular longitudinal dorso-median black 

 band on at least mesothorax 33. 



33. Usually a black triangle on, but not coextensive with, prescu- 



tum, rest of dorso-median area of mesothorax usually im- 

 maculate, sometimes black on mnles, dorsum of abdomen 

 black, head four-sevenths as long as broad, sometimes almost 

 twice as broad as long, 13 to 16 setae on submarginal vein. 



pomiforniis (p. 70). 

 Usually an irregular longitudinal dorso-median black band on 

 mesothorax, sometimes including pronotum, dorsum of abdo- 

 men black, head three-fifths as long as broad, 12 to 14 setae on 

 submarginal vein querci-lanae (p. 72). 



1. DECATOMA VACCINIICOLA. new species 



Plate 1, Figure 1: Platk 3, Figures 30, 31, -33; Plate 4, Figures 35, 36, 40 



Decatonia mihlistigma Ashmead, Trans. Amer. Ent. Soc, vol. 14, p. 198, 1887 



( misidentification ) . 

 Decatoma v>arians Provanches, Additions i la faune hymenopterologique, 



p. 194, 1889 (misidentification). 



Recognizable by the yellow, more or less infuscated body, the usu- 

 ally dusky to black antennae, and the relatively long funicular joints, 

 which are about one-third longer than broad in the female and twice 

 as long as wide in the male. The submarginal band aids in recog- 

 nizing the species. It resembles />. flava Ashmead and D. niibili- 

 stigma Walsh most closely, but the above characters distinguish it 

 from them. 



Female. — ^Length 2.8 to 3 mm.; color mostly yellow to brown- 

 yellow, in part sometime^ golden brown; antennae smoky black, ex- 

 cept that pedicel is yellow at apex, especially below, and scape and 

 pal'pi are entirely light yellow ; eyes pink, mandibles brown to black, 

 ocellar area in part dark brown, rest of head dull yellow to light 

 brown, in some specimens with more or less of the surface speckled 

 dark brown or continuous dark brown; prothorax pale dull yellow 

 with apex of scutel, lower part of scuto-axillar groove, and sternum. 



