NOllTH AMKKICAN H YMENOl'TKKA. 247 



veiilrals 2 aiul :', on apical margins, and the seventh dorsal segment, silvery. 

 Wings davo-hyaline, apical margins fuscous, nervures ferruginous. Length 

 11 — 17 mm. 



Texas, Missouri, ('alitorniiv, Washiugton, Mexico. 



16. — Tacliytes sericatiiM Cress. 



9- — Anterior margin of clypeus slightly emargiiiate nicMlially, its extreme 

 side armed with two rather indistinct teeth-, vertex more finely and closely 

 punctured than in pepticus. and lacks the larger scattered punctures which that 

 species possesses, the medial impressed line faint; third antennal joint l)ut little 

 longer than the fourth, which is about equal to the fifth, tenth and eleventh 

 joints not more than twice longer than they are wide; space between eyes at 

 top is less than in pepticus; region enclosed by the ocelli impressed. Thorax 

 punctured like the vertex depression on anterior part of dorsulum not strong: 

 scutellum not at all impressed ; the base of metanoium is marked by a faint 

 fovea, the apex with a strong one;* tibi* and tarsi armed with strong, whitish 

 spines. Abdomen beneath, on segments 1 and 2, punctured as above; basal por- 

 tion of .segments 3 — 6 smooth, shining, apical portion with large, sparse punc- 

 tures, black; mandibles piceous; palpi, tegular, nervures. apex of tarsi testa- 

 ceous; front, face, clypeus, clothed with silvery pubescence; cheeks, thorax, 

 almost entirely, and legs with silvery pile; metathorax with long, pale pubes- 

 cence; abdomen above silvery sericeous when viewed from behind brightest on 

 apical portion of the segments ; pygidium bronzy. Length 12 — 14 mm. 



%. — Form more slender than the female; antennse long, fourth joint about 

 one-third longer than the preceding one, joints 4 — 7 about equal in length; re- 

 gion enclosed by tlie ocelli more strongly impressed than in the feniale; vertex 

 and thorax distinctly punctured ; furrow on posterior face of metathorax not so 

 strong as in the female, and reaches to the apex ; tibise and tarsi rather strongly 

 spinose. Abdomen finely and closely punctured above and beneath, less silvery 

 than the female; last dorsal segment silvery ; eighth ventral roundly emargiiiate- 

 Length 10—11 mm. 



Texas, Georgia. 



17. Tachytes riifofasciatus Cress. 



9. — Anterior margin of clypeus rounded, not emargiiiate, not dentate later- 

 ally ; vertex very finely and closely punctured and with a few large, scattered 

 punctures; depression behind ocelli deep, parted by an impressed line; region 

 enclosed by the ocelli more distinctly punctured, divided by a very strong sulcus; 

 third antennal joint distinctly longer than the fourth, which is, if anything, a 

 little longer than the fifth ; space between eyes at top greater than in sericatus. 

 a little wider than the length of joints 2 and 3 of autennsp. united. Tiiorax 

 punctured like the vertex; scutellum impressed medially; metanotum with 

 shallow, indistinct punctures, not furrowed, tibife and tarsi armed with strong, 

 wliitish spines, black ; mandibles, except tips, four anterior tibia?, tarsi and ab- 

 domen, more or less reddish : the abdomen varies from almost black to entirely 

 ferruginous. Wings subhyaline, with or without a yellowish tinge, nervures 



•■■ A specimen from Florida (coll. U. S. National Museum), which I have doubi- 

 fuUy referred to this species, has the metanotum strongly furrowed. 



TRANS. AM. F.NT. SOC. XIX. AUGUST, 1892. 



