238 WILLIAM J. FOX. 



between the eyes at the top is greater than the length of joiuts 2 and 3 of the 

 antennse united ; region enclosed bj- the ocelli separated by a very strong furrow ; 

 vertex finely and closely punctured; first joint of fiagellum scarcely a qviarter 

 longer than the second. Thorax very finely and closely punctured; scutelluni 

 scarcely impressed ; metanotum with a very strong and wide sulcus medially, the 

 furrow very delicately and transversely striated at about the middle and is 

 broadened at the base ; the posterior face also strongly furrowed medially : tibiae 

 armed with long thorns, in length they are about equal, in some cases longer 

 than those on the fore tarsi. Abdomen with exceedingly fine and close punc- 

 tures above ; ventral segments 3— 6 shining, with sparse, distinct punctures, those 

 on segment six strongest and more compact; pygidium with coppery pubescence, 

 not depressed along the sides, black ; basal half of mandibles, scape, except line 

 above, tegulse, apex of femora, tibise and tarsi ferruginous; marginal cell reach- 

 ing to the apex of the third submarginal ; front, face and clypeus clothed with 

 dense, silvery pubescence and with longer hairs of the same color. Thorax and 

 femora clothed with pale golden hair, most dense on thorax beneath, that on the 

 metatborax palest; dorsal sutures of thorax filled with pubescence similar to 

 that on the face; apical margins of abdominal segments 1 — 4 silvery. Length 

 14—16 mm. 



'^ .— Eesembles the female; anterior margin of tlie clypeus thickened in the 

 middle and armed with a very large tooth on each extreme side; the third an- 

 tenual joint is much longer than the fourth; joints 3 — 7'rounded out beneath, 

 especially the fourth and fifth ; metanotum with a fovea at base and apex, finely 

 granulated ; hind tarsi not at all spinose ; longer spur of hind tibise shorter than 

 the first joint of the hind tarsi ; eighth ventral segment with an even, rounded 

 emargination. Length 12 — 14 mm. 



Occurs from Connecticut to Florida, Montana, Nebra.ska. Smaller 

 male specimens (which may he, as Mr. Patton has suggested, a sea- 

 sonal dimorph) have the groove on metanotum distinct and the 

 clypeus is armed with three small teeth laterally. 



3. Tachytes liarpax Patt. PI. XI, fig. 5. 



J .—Medial production of the clypeus strongly impressed, or bituberculate, 

 the three lateral teeth equally distinct; depression behind ocelli tolerably strong, 

 less so than in mandibularis ; medial impressed line of the vertex distinct; ver- 

 tex with strong, sparse punctures; dorsulum with very fine, but distinct punc- 

 tures, the depression in the middle anteriorly, not strong; scutellum with a 

 slight medial impression; metanotum having the appearance of being very finely 

 granulated, a fovea at base connected with the fovea at apex by a faint impressed 

 line; tibite and tarsi strongly spinose; ventral abdominal segments 3 — 6 with 

 large, sparse punctures, the punctures more abundant than in mandibularis ; 

 black; mandibles and scape beneath dark rufo-piceous : labrnm, tegulse. neura- 

 tion of wings, knees, tibise, except a dark stripe beneath and tarsi, yellow-ferru- 

 ginous. Wings hyaline, apical margins slightly darker. Head, thorax and first 

 segment of the abdomen, clothed with pale fuscous pubescence; front, fiice, 

 clypeus, cheeks, pleura, femora, collar and apical margins of dorsal segments 

 I — 4 and the pygidial area silvery. Length 12—14 mm. 



"^ . — Anterior margin of clypeus rounded or forming a slight angle in the 

 middle, with three small teeth laterally ; joints 1 — 3 of the flagellum about equal 



