240 WILLIAM J. FOX. 



distinctly punctured than the dorsulum, with a distinct medial impression; 

 metanotum with a narrow, but very distinct medial sulcus, the fovea at apex 

 broad and shining; posterior face shining, the punctuation even finer than that 

 on the dorsulum, deeply sulcate; spines on the tibise long and strong, as long or 

 longer than those on the fore tarsi; ventral abdominal segments 1, 2 and the 

 remainder laterally, finely and closely punctured, otherwise with strong, sparse 

 punctures, black; basal half of mandibles, scape beneath, tegulse. except base, 

 apex of femora, tibiae and tarsi, yellow-ferruginous; clypeus and front densely 

 covered with silvery-gray pubescence and with longer pale hairs. Thorax, first 

 segment of abdomen and femora, the latter sparsely clothed with grayish pu- 

 bescence; apical margins of dorsal segments 1 — 4 and ventrals 2 and 3 silvery; 

 pygidium with silvery pubescence. Wings subhyaline, with a slight yellow 

 tinge, the nervures colored like the tegulse, third submarginal cell extending 

 beyond the apex of the marginal. Length 15 mm. 



% . — Anterior margin of clypeus produced into a quadrate lobe medially, 

 armed with two extreme lateral teeth, the outer one of which is largest and 

 most distinct; space between eyes at top about equal to length of second and 

 third joints of the antennse united ; 1 — 4 of the flagellnm distinctly rounded out 

 beneath, but so strongly as in the allied species, the fifth and sixth joints are 

 but slightly rounded out, first joint in length about equal to the second and is 

 much narrowed basally; scutellum not strongly impressed medially; metanotum 

 strongly furrowed, the furrow broadened apically, forming the large fovea; tibise 

 and tarsi distinctly spinose; longer spur of hind tibise a little shorter than the 

 first joint of hind tarsi ; emargination of eighth ventral ])late subangular. Legs, 

 except coxiB, trochanters and basal portion of femora, yellow-ferruginous. 



Length 12 — 13 mm. 



Texas ; Springfield, Mass. This species is not a synonym of 

 validus, as some authors have supposed. 



6. Tachytes pra'dator n. sp. PI. XI, fig. 4. 



J. — Median production of the clypeus divided into two distinct lobes, the 

 extreme lateral teeth large and distinct; space between the eyes at top much 

 narrower than in anj' of the allied species, if anything, a little less than the 

 length of the second and third antennal joints united ; joints 1 — 3 of the flagel- 

 lum about equal, the third is possibly slightly shorter; dorsulum and scutellum 

 with microscopic punctures, the latter strongly impressed medially; metanotum 

 very finely granulated, with a faint impressed line, the fovea at apex deep and 

 triangular: tibiae and tarsi aimed with strong spines. Abdomen beneath on 

 segments 3 — 5, with fine sparse punctures, those on segment six coarse; pygidium 

 bronzy, longer and the sides straighter than in the allied species, in shape similar 

 to T. abdominalis ; black ; basal half of mandibles and the scape beneath ferru- 

 ginous; greater part of anterior femora, apical portion of four hind femora, 

 tibise, tarsi and tegulse, yellow ferruginous ; face, front, clypeus, cheeks and 

 thorax rather densely clothed with golden pubescence, and in addition have 

 longer, paler hairs; abdominal segments 1 — 4 above and 2 — 4 beneath on the 

 sides, silvery. Wings flavo-hyaline, the third submarginal cell extending beyond 

 the marginal. Length 17 mm. 



'^ . — Anterior margin of clypeus strongly rounded out in the middle, with one 

 large, lateral touth, situated in a broad emargination ; furrow on the vertex long, 



