330 BULLETIN 45, UNITKD STATES NATIONAL MrSEUM. 



iBocybuB longiventris AhIiiii. 

 Can. Ent., Vol. xix, p. 130; Cross. Syii. Hyni., p. 249. ^ 



9 . Lcnjjth, 1"" ". Polished black, impuiictured ; head large, quadrate, 

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

 except the club and th«' legs bright yellow; club brown, 5 jointed. 

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

 furrvWs; scutelluni convex, the nietathorax pubescient. Abdomen long, 

 a<*ununate, almost twice as long as the head and tliorax together. Wings 

 hyaline. 



IIAIHTAT. — Jack.sonville, Fla. 



Type in Coll. Ashniead. 



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

 my original description, this insect is not a genuine hocybus, and is pla<!ed 

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

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

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

 clude it from that genus. 



Subfamily VII.— HELOIUN^.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 G-jointed. Labial 

 palpi 3-jointed. Antennfe porrect, 15-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; scutelluni small, semicircular, subconvex, transversely 

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

 riorly. Front wings rather broad at tips, with a large, oblon g, 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- 

 Ifir 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 margiu before attaining oue-tliird the length ot 

 the wing. 



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

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

 the posterior tarsi lengthened a little longer than their tibiae j tibial spurs 

 1, 2, 2, the claws pectinate. 



This subfamily is at once distinguished by the venation, the basal 

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

 nervure and forming a triangular cell; the large conical -shajied petiole, 

 and the pectinate claws. 



Only one genus is Icnown, Melorus Latreille, although Abbe Pro- 

 vaucher has described in his "Additions k la Faune Hymenopterologiqae 



