330 BULLETIN 45, UNITED 8TATE8 NATIONAL MUSEUM. 



Isocybus longiventris Ashrn. 

 Can. Ent., Vol. xix, p. 130; Cress. Syn. Hym., p. 249. 



? . Length, 1'""'. Polished black, irapiinctured ; head large, quadrate, 

 convex before, the lateral ocelli far away from the eye margin ; anteunie, 

 except the club and the legs bright yellow; club brown, 5-joiuted. 

 Thorax twice as long as the head is long antero-posteriorly, without 

 furrows ; scutellum convex, the nietathorax pubescent. Abdomen long, 

 acuminate, almost twice as long as the head and thorax together. Wings 

 hyaline. 



Habitat. — Jacksonville, Fla. 



Type in Coll. Ashmead. 



Described from a single specimen. As I have already indicated in 

 my original description, this insect is not a genuine Lsocybns, and is placed 

 here only provisionally or until more specimens are taken and the species 

 can be properly studied. In the shape of the abdomen it recalls 

 Polymecus, but the quadrate head and the position of the ocelli will ex- 

 clude it from that genus. 



Subfamily VII.— HELORIX.E. 



Head transverse, the vertex broad. Ocelli 3, in a triangle. Eyes large, 

 oblong-oval. Mandibles depressed, the apices acute, the exterior mar- 

 gin rounded, the interior bidentate. Maxillary palpi O-jointed. Labial 

 l)alpi 3 Jointed. Antenna^- porrect, la-jointed, inserted on the middle of 

 the face. Pronotum distinctly visible from above, the sides impressed, 

 striated, and anteriorly produced into a slight neck; mesonotum with 

 two furrows; scutellum small, semicircular, subconvex, transversely 

 impressed across the base; metathorax short, obtusely rounded poste- 

 riorly. Front wings rather broad at tips, Avith a large, oblong, stigmated 

 marginal vein, two basal cells, a triangular closed marginal cell and 

 closed discoidal cells ; the basal vein does not attain the submarginal, 

 but is abruptly bent backward, forming with the median vein a triangu- 

 lar cell, and with the submedian vein a subquadrate discoidal cell ; hind 

 wings also broad, with a distinct submarginal vein that curves obliquely 

 backward to the hind margin before attaining one-third the length of 

 the wing. 



Abdomen petiolated, obconic; the petiole very long, swollen toAvard 

 base ; the second segment very large, the following short. Legs moderate, 

 the posterior tarsi lengthened a little longer than their tibia' ; tibial spurs 

 1, 2, 2, the claAvs pectinate. 



This subfamily is at once distinguished by the A'enation, the basal 

 nervure being abruptly bent, intersecting Avitli the base of the recurrent 

 nerA'ure and forming a triangular cell; the large conical-shaped petiole, 

 and the pectinate claws. 



Only one genus is known, IleJorus Latreille, although Abbe Pro- 

 Vancher has des(;ribed in his "Additions a la Faune Hymenopterologique 



