1869.] 271 [Cresson. 



The S is rather more slender than the ? ; sides of the face, extend- 

 ing a short distance above insertion of antennae, clypeus, a trianguhir 

 space above, labrum, a spot on mandibles, most of anterior tibiae, 

 and all the tarsi except tips, leraon-yellow ; otherwise marked like the 

 ? ; flagellum of antennas more or less testaceous beneath; abdomen 

 more pubescent at apex. Length two to three lines. 



Hab. Ct., N. Y., Pa., Va., 111., Col. Ter. (Coll. Am. Ent. Soc.) 

 A very common species. Varies much in size. Sometimes the col- 

 lar is immaculate. In the S the yellow line on each side of the face 

 varies in length, but never curves inwardly above insertion of 

 antennjE. "^ 



4. P. sparsa, n. sp. 9 . Differs from affinis by the punctures 

 of head and thorax being much more sparse, and by the subqiiadrate 

 head; the base of metathorax is only slightly rugose, the apical half 

 of the enclosed space being smooth and shining; a subtriangular spot 

 on each side of the face, tubercles, a narrow, interrupted band on 

 collar and base of posterior tibiae pale yellow; wings dusky-hyaline, 

 iridescent; labrum strongly produced. Length three lines. ,'' 



Hab. Pennsylvania. (Coll. Am. Ent. Soc.) ^^ 



5. P. verticalis, n. sp. i . Black ; head and thorax densely~\, 

 punctured, clothed with a short, thin, pale pubescence; sides of face, 

 clypeus, an elongate triangular piece above, spot on base of mandi- 

 bles, tubercles, anterior tibiae, spot at base of four posterior tibiae, and 



all the tarsi, except tips, leraon-yellow ; the stripe on each side of the 

 face curves inwardly just above the insertion of antennae, and ends in 

 a smooth, polished, rounded space — not seen in any of the other 

 species; antennae nearly as long as head and thorax, the scape larger 

 than usual, dilated; metathorax coarsely rugose at base; wings hya- 

 line, iridescent, dusky at apex, neither of the recurrent nervures enter 

 the second submarginal cell; abdomen shining, first segment polished, 

 the remainder feebly punctured, and clothed with a short pubescence, 

 which becomes more dense on apical segments. Length two and one 

 half to three lines. 



Hab. Mass., Penn., Coll. Ter. (Coll. Am. Ent. Soc.) y 



6. P. antenuata, n. sp. 3 . Differs from verticalis by the pale~^ 

 markings being white; the anterior orbits curve inward more suddenly \ 

 at insertion of antennae, above which there is no polished space; the 

 scape is more dilated, being triangular in shape, and has a white spot 



in front; the anterior tibiae have a white stripe In front, the middle 

 pair a spot at base, and the posterior pair a broad annulus at base; 



