AMERICAN HYMENOPTERA. 321 



Judged by its poorly defined pygidium, this species would be 

 grouped with the species about balteola, but as it has no other 

 relationship with these) and is obviously allied to the new forms 

 here grouped about it, it is placed with them in the group antho 

 phone- of Mr. Fox. 



88. Hutillu impar sp. nov. 



Female. Ferruginous, closely punctured, nearly bare, apex of abdomen black, 

 bead rounded, eyes irregularly rounded, poorly facetted, polisbed, mandibles 

 edentate, thorax elongate oval, raised posteriorly, metathorax rounded, first and 

 second segments of abdomen broadly sessile, pygidium strongly striated, rufous. 



Head ferruginous, round, not carinate, closely punctured, more sparsely and 

 minutely beneath, pubescence sparse and short, yellowish ; eyes irregularly 

 rounded, convex, scarcely facetted, polished ; clypeus entire ; mandibles triangu- 

 lar in section, straight ou outer part, pointed, thick ba sally due to a tubercular 

 projection on outer side, tips blackened, mandibular hairs and mystax long but 

 sparse, palpi pale yellow ; scape about equalling the length of the mandible, rather 

 thick, twisted, punctulate. nearly glabrous, pedicel slightly shorter than the 

 nearly equal flagellar joints, the last joint one-half longer than the others. Tho- 

 rax elongate ovate, equal in width to the head, its pubescence inconspicuous, 

 concolorous, the punctuation stronger hut not so close as on the head, humeri 

 rounded, metathorax rugoso-punctate, the disc with longer erect yellow hairs, 

 sides rounded. At the. raised posterior part of the rnesothorax the rugose punc- 

 tures take on the character of scales in the largest specimen. Pleura? punctured 

 as ou the dorsulum in front, posteriorly smooth and shining. Abdomen slender, 

 finely punctured, petiole broadly contiguous with the second segment, ventral 

 keel inconspicuous, pubescence of first segirent erect, silvery, moderately dense, 

 of second segment short, appressed, sparse, black except for two lateral spots of 

 denser silvery hairs In one of the smaller specimens the pubescence of this seg- 

 ment is denser and dusky, not black, and the lateral spots are wanting. Second, 

 third, fourth and fifth segments fringed with whitish pubescence; first and sec- 

 ond segments concolorous with the head and thorax, remainder of abdomen 

 except the prominent rufous pygidium black, pygidium sharply margined and 

 deeply longitudinally sulcate. Legs testaceous, the apices of the tibiae piceous, 

 posterior tibiae fringed with yellow bristles and hairs, spurs not lengthened. 



Length, 4-7 mm. 



Fig. 36 ; petiole. 



Two females, 4 and 7 mm., Fedor Tex., May, 1901 (Rev. G. 

 Birkinan). 



Var. : tooth on outer side of mandible wanting, pygidium finely 

 granular, second abdominal segment without the lateral patch of 

 silvery pubescence, otherwise identical. Length, 4 nun. 



One specimen, Fedor, Tex., April 28th (Rev. G. Birkinan). 



89. ^1 hi i I l;t pervaga sp. nov. 



Female. Entirely rufous except the antenna* and posterior legs, which an- tes- 



TKANS. AM. F.NT. SOC. XXIX. (41) OCTOBER. 1903 



