78 PROCEEDINGS OF THE NATIONAL, MUSEUM vol.79 



1885, " on buds of white oak " ; and data are at hand for a Michigan 

 specimen (Agr. Coll. Mich., Ace. Cat. 592c) reared May 20, 1888, 

 from the gall of Neurotems noxiosus (Bassett) on " swamp oak." 



31, DECATOMA QUINQUESEPTAE, new species 



Near D. foliatae Ashmead in having the yellow on the prescutum 

 variable and the scutel almost always entirely black, and in the num- 

 ber of setae on the submarginal vein ; D. quinquese'ptae is somewhat 

 larger and less robust, and differs most conspicuously in having most 

 of the sides of the abdomen ochreous-yellow, whereas these are en- 

 tirely dark in foliatae. 



Female. — Length 2.4 to 2.7 mm., colors yellow and black; head 

 black, only narrow ocular band with sometimes an oblique projection 

 from it on vertex toward scrobe, and oral area, labium, and space 

 below antennal fossae and between malar grooves more or less, yellow- 

 ish brown; scape lemon yellow, its radicle yellowish brown, pedicel 

 dark brown outwardly, only small part of apex lighter, flagellum 

 uniformly light chestnut-brown; pronotum mostly lemon yellow, 

 black of neck extending caudad and forming subquadrangular patch 

 on middle third of pronotum and occasionally reaching hind edge, 

 usually leaving narrow border of yellow on hind edge of pronotum ; 

 mesonotum mostly black, parapsidal grooves rather broadly, and 

 posterior part of side of, or more often more than posterior half of 

 scapulae, yellowish orange, tegulae light brown, upper edge of pleura 

 brown, scutel, axillae, metanotum, propodeum, and venter of thorax, 

 black; legs mostly immaculate lemon yellow, only base of coxae some- 

 times narrowly black, and tarsi stramineous-yellow; stigma dark 

 brown, faint rudiment of submarginal band present ; peduncle black, 

 upper two-thirds of first abdominal segment black to brown, lighter 

 beneath, upper third of second segment brown black, lower edges of 

 dark areas irregular, dorsum of posterior half of abdomen lightly 

 inf uscated, and most or all of its lateral surfaces and venter ochreous- 

 yellow. 



Head from above three-fifths as long as its maximum width, face 

 rather well-rounded transversely between eyes, more prominent 

 dorso-ventrally, eyes and face not abruptly set apart at their junc- 

 tion, vertex moderately convex, hind edge of head feebly convex, 

 hence head not approaching rectangulate-ovate from above; lower 

 portion of genae and most of malar space polished, shiny, upper 

 part of cheeks becoming strigose-reticulate, ocellar area finely punc- 

 tate, also bearing small mnbilicate punctures, rest of head more 

 coarsely reticulate-punctate, and moderately hairy, antennae more 

 densely hairy ; pedicel scarcely twice longer than its maximum thick- 

 ness, conical, about a fourth longer than Fl, Fl nearly a fifth longer 



