NORTH AMERICAN IIYMKNOPTKRA. 239 



in lenp;tii, joints 1 — 5 very strongly rounded out beneath; scutelluni distinctly 

 impressed medially; metauotum furrowed; eighth ventral plate narrowly in- 

 cised ; seventh dorsal segment and the sixth ventral each with two tufts of dark 

 brownish hair; second submarginal cell much narrower than the third at the 

 toj) ; hind tarsi distinctly spinose. Length 12 mm. 



Connecticut, Vermont, New Jersey, S. Dakota (Aldrich). 



4. Tachytes calcaratus u. sp. PI. XI, figs. 3 and 7. 



9 . — Median process of anterior margin of the clypeus incurved at ajiex, tiie 

 extreme lateral teeth not strong; space between the eyes at toj) equal to, or a 

 little greater than the length of the second and third anteunal joints; first 

 joint of the flagellum slightly longer than the second, which is in turn longer 

 than the third joint : dorsulum and scutellum microscopically punctured, the 

 latter strongly impressed medially; metanotum sculptured as in prxdator, and 

 is also longer, the imiu-essed line not so distinct, the fovea at apex is broader and 

 shallower, and is finely and transversely striated on apical portion ; tibije and 

 tarsi strongly and copiously armed with strong spines; longer spur of hind tibiae 

 about one-quarter longer than the first joint of hind tarsi. Abdomen beneath, 

 on segments 3 — 5, punctured like the second segment, the apical portions, me- 

 dially, sparsely punctured ; third segment on middle basal portion impunctate; 

 pygidiiim longer, and the apex is narrower than in mandibular is and harpax ; 

 black ; basal half of mandibles, scape beneath, tegulte, except base, the apex of 

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

 thorax with silvery-gray pubescence, and in addition with long gray hairs, which 

 are especially prominent on metathorax and first segment of abdomen ; dorsal 

 abdominal segments 1 — 4 and ventrals 3 and 4 laterally, silvery ; pygidium with 

 golden pubescence. Wings subhyaline with a yellowish tinge, nervures darker 

 than the tegulae ; third submarginal cell extending beyond the marginal. Length 

 17 mm. 



% .—Anterior margin of clypeus in the middle subtruncate and with two ex- 

 treme lateral teeth; third joint of antennae a little longer than the fourth ; 

 joints 1 — 5 of the flagellum .strongly rounded out beneath, especially the three 

 basal ones; space between the eyes at top about equal to the length of antennal 

 joints 2 and 3; pubescence of the front and clypeus silvery; dorsulum and 

 scutellum more distinctly punctured than in the female; impressed line on 

 metanotum rather strong, the fovea at apex sometimes contiguous with the fur- 

 row on posterior face ; tibiae and tarsi spinose ; longer spur of hind tibise a little 

 longer than the first joint of hind tarsi ; emargination of eighth ventral plate 

 somewhat angular. Length 12 — 13 mm. 



Florida (collection U. S. National jNIuseuin), New Jersey, August 

 24th, Montana (?). The Montana specimens may belong to a distinct 

 species. 



5. Tachytes breviveiitris Cress. PI. XL fig. 6. 



9.— Anterior margin of clypeus as in validus, except that it possesses but two 

 distinct lateral teeth and medial production not impressed ; space between the 

 eyes at top slightly greater than the length of antennal joints 2 and 3 united ; 

 first joint of the flagellum scarcely one-quarter longer than the second ; vertex 

 as in validus; dorsulum with microscopic i)unctures; scutellum a little more 



TRANS. AM. ENT. SOC. XIX. AUGUST, 1892. 



