510 PROCEEDINGS OF THE ACADEMY OF [1893. 



each extreme side; front very finely and closely punctured, appear- 

 ing granulated, the punctures on the vertex are also fine but are not 

 so close as those on the front; space between the eyes at top a little 

 less than the length of antennal joints 2 and 3 united; first joint of 

 the flagellum a little more than one-fifth shorter than the second; 

 dorsulum with distinct, close punctures, its medial portion only de- 

 pressed anteriorly and then not strongly; scutellum convex, not im- 

 pressed, punctured like the dorsulum; metathorax above strongly 

 reticulated, especially at the base, the sides and posteriorly finely 

 striated, the posterior face with the fovea elongate, acute beneath and 

 broad at the upper end; legs rather stout, well armed with spines; 

 marginal cell truncate; space between the second and third submar- 



ginal cells at the top about equal; abdomen ?. 6 Black; spot 



on scape, at apex beneath, mandibles in the middle, and legs except 

 coxte, trochanters and the fore and medial femora above, red ; front, 

 face, clypeus and the thorax more or less clothed with silvery pub- 

 escence, brightest and densest on the face, clypeus and mesopleune; 

 wings subhyaline, iridescent, nervures testaceous; tegulse yellow. 

 Length about 9 or 10 mm. 



Texas. The type of this species, which seems to be very rare, is 

 in the collection of the United States National Museum. 



3. — Tachysphex posterus n. sp. 



9 • — Clypeus with large, deep punctures, its anterior margin 

 rounded-out, subtruncate medially, and not dentate laterally; front 

 finely and closely punctured below the middle, but above that the 

 punctures are strong and separated ; the vertex more finely punctured ; 

 space between the eyes at the top greater than the length of antennal 

 joints 2 and 3 united, but less than the length of joints 3 and 4; first 

 joint of the flagellum about one-third shorter than the second; dor- 

 sulum with distinct, separated punctures (the punctures are much 

 more distinct than in either of the two preceding species), depressed 

 in the middle for about two-thirds its length, the punctures most com- 

 pact anteriorly ; scutellum convex, not impressed, punctured similarly 

 to the posterior portion of the dorsulum; metathorax above finely 



6 The abdomen of the only specimen seen by me, the type of the species, is lost. 

 I take the following from the original description : "abdomen fulvo-ferrugineus, 

 with a very fine silvery sericeous pile, more dense at the sides and apex of the 

 segments, the three apical segments black." 



