50 
6. Pteronus latifasciatus Cresson. 
1880. Xematus latifasciatus Cresson. Trans. Am. Ent. Soc, vm, p. 7. 
1880. Nematua latifasciatus Provanoher, Add. Faun. Can. llym., p. 24. 
1895. Xeniatus latifasciatus Dyar. Trans. Am. Eut. Soc, XXII, p. 301. 
Female. — Length 8 mm.; somewhat elongate, shining ; clypeus shal- 
low ly and broadly emarginate, lobes short, broad ; frontal crest and sides 
of pentagonal area strongly raised; antennal fovea large, oval, deeply 
excavated ; antenna 1 unusually slender and long, almost equaling thorax 
and abdomen in length, third and fourth joints subequal; intercostal 
oblique and almost its own length anterior to basal vein; upper cell of 
hind wings extending nearly one-fourth its length beyond lower; stignia 
narrow, elongate; sheath moderately robust, obtusely pointed, with 
straight upper margin; cerci very slender and nearly as long as second 
transverse cubital vein; claws very deeply notched, rays almost equal. 
Color of head, thorax with basal plates, four terminal segments of abdo- 
men dorsally and sheath, tips of bind femora, apical half of hind tibia*, 
hind tarsi, and extreme bases of hind coxae brownish black; tips of ante- 
rior tarsi dusky: tips of cl\ pens, labrum, bases of mandibles, palpi, and 
basal half of hind tibia- whitish; upper margin of pronotnin, tegulse, 
first four segments of abdomen dorsally except apex of fourth, all of 
venter, and legs yellowish ferruginous; wing veins, including costa, 
brown. 
One female, Oresson's type. New Hampshire. (Coll. Am. Ent. Soc.) 
Mr. II. (J. Dyar has characterized the larva (1. c.) from specimens 
found on birch. 
7. Pteronus ventralis Say. 
1821. Nematua ventralis Say. Keating's N.nr. Exp., II, App.,p. 315. 
L859. Nematua veniralia LeConte. Say, Ent., n, p. 211. 
1861. Nematua ventralia Norton. Proc. Best. Soc Nat. Hist., vin, ]>. 15!). 
1867. Nematua ventralia Norton. Trans. Am. Ent. Soc, I, p. 201. (Cat., etc., p. 63.) 
1869. Nematua ventralia Scudder. Ent. Corr. Harr., p. 270. 
1870. Nematua ventralia Riley. Am. Eat. and Hot., n, p. 276. 
1^7:;. Nematua ventralia Sylvester. Bept. U. 8. Dept. Agric., p. 254. 
1881. Xematus ventralis Thomas. 10th Rep. Ent. 111., 1880, p. 68. 
1885. Nematua rent rati* Forbes. 11th Rep. Ent. 111., 1884, p. 117. 
1888. Ncmatus ventralis Howard. Insect Life, i, p. 33, fig. 5. 
1889. Xeniatus ventralis Lngger. Bull. 9, Minn. Exper. 8ta.,p. 51. 
1889. Xeniatus centralis Orcntt. Hull. 13, Dakota Exper. Sta., p. 13. 
1889. Xeniatus ventralis Hruuer. Hull. 14, Nebr. Exper. Sta., p. 78. 
1890. Xematus ventralis Packard. Rep. U. 8. Ent. Comm., v, pp. 524,588. 
1891. Xematus ventralis Orcutt. Hull. 22, S. Dak. Exper. Sta. (March). 
1895. Xematus ventralis Dyar. Trans. Am. Ent. Soc., XXII, p. 301. 
Female. — Length 8 mm.; only moderately robust; abdomen broadest 
beyond middle, shining; clypeus broadly and shallowly emarginate, 
lobes rounded; frontal erest large, indistinctly broken; ocellar basin 
well defined; antennal fovea deep, elongate, triangular; antennae slen- 
der, distinctly tapering, smooth, third joint usually slightly exceeding 
