250 BULLETIN jr., UNITED STATES NATK^NAL MUSEUM. 



Iphetrachelus americanus Ashni 

 (PI. M, Fig. 1, <?.) 

 Proc. Ent. Soe. W:iisli., ii, p. r.8, 1890. 



S . Lengtli, O.G""". Black, sliinin,u-, delicately niicroscoi)ically punc- 

 tate and faintly sericeous, 



Antennic and legs uniformly yellow, Antennai nodose-pedicellate, 

 with whorls of long Lairs; ikhUccI rOunded; second funiclar joint trian- 

 gular. Thorax somewhat flattened on the disk, without distinct fur- 

 rows, although there are two shallow longitudinal furrows on the shoul- 

 ders. Scutellum semicircular, subconvex, separated from the mesono- 

 tuni by a delicate transverse grooved line. Tegulte yellow. Wings 

 hyaline, with a long fringe at ai)ex, the snbmarginal vein pale yellow, 

 knobbed at tip. Abdomen long, oval, smooth, polished and black, 

 except the first segment, which is yellow. 



Habitat. — Arlington, Va. 



Type in Coll. Ashmead. 



Described from a single specimen, taken l»y sweeping. 



ALLOTROPA Fr.ister. 



Hym. Stud., ii, p. 106 (1856). 



(Tyjxi A. mecrida Walk.) 



Head transverse; ocelli 3, the lateral rather close to the margin of the 

 eye. 



Antenna^ inserted jnst above the clypeus, 9-jointed in both .sexes, the 

 flagellar joints in $ dentate, verticillate; scape stout, fusiform, i»edicel 

 small, globose, in 9 clavate, ending in a 4-jointed club. 



Maxillary palpi 2-jointed; labial palpi 1 -jointed. 



Thorax ovoid, the mesonotum with 2 faint furrows; scutellum short, 

 semicircular; metathorax short, the i)osterior angles subacute. 



Front wings pubescent, the snbmarginal vein short, ending in a 

 knob. 



Abdomen long-ovate, convex, narrower than the thorax, the first 

 segment short, broad, the second large, the following very short. 



Legs moderate, the femora clavate, tibiae and tarsi slender. 



This genus is distinguished at once from all the other genera iu hav- 

 ing 9-jointed anteuna^ in both sexes. 



AUotropa aniericana Aahni. 



(PLxi. Fig. 2, 9.) 



Cau. Eut., XIX, p. 125; Cress. Syu. Ilym., p. 248. 



9. Length 1.4""". Black, closely minutely punctulate; head trans- 

 verse, opaque, the lateral ocelli twice their width from the margin of 

 the eye; mandibles rufous; antenuie 0-joiuted, ending in a 4-jointed 

 club, the joints serrate toward one side; scape rufous; pedicel and 



