296 T. D. A. COCKERELL. 



narrowly reddish yellow ; posterior tibije with more than the basal (proximal) 

 third pale yellow: tarsi yellowish, with a reddish tinge, darkened toward the 

 tips. Wings hyaline, with a slightly dusky tinge ; second suhmargiual very little 

 narrowed toward marginal, rather more than half as long as first submarginal. 



Hab. —IjUS Cruces, New Mexico, on Solidago, by the aceqiiia, 

 cloj^e to Schaubliii's mill, Aug. 24, 1894 (C/kll., 1997), also two other 

 specimens taken on tiie same day ((*kll., 1971, 1956). The locality 

 of subtilu is about two and three-fourths miles from that of P. hlpes. 



Mr. Fox observes that subtilk " is evidently new, differing in its 

 subtile sculpture, color of antennae, and spot at apex of clypeus." 



This Sj)ecies and hlpes were sent to ^Ir. Fox with a query as to 

 their identity with P. IhtiblfrouA, but he informs me that they are 

 not that species, and points out that they are certainly also distinct 

 from one another. 



Although they present considerable superficial resemblance, careful 

 examination reveals numerous points of difference which cannot be 

 attributed to variation. The following table will assist in their 

 se})aration : 



P. bipes. P. subtilis. 



Size larger, form stouter. Smaller, more slender. 



Punctuation of vertex and mesothoras Punctuation shallow, and not nearly so 



strong and deep. noticeable. 



Metathorax more rugose. Metathorax less rugose. 



Yellow marks on face resembling hu- M^irks on face broadly triangular, not 



man feet. resembling feet. 



Clyx>eus entirely black. Clypeus partly rufous. 



I'erflita iiiinierata n. sp. 9- — Length about 5.5 mm.; head and thorax 

 brassy green, abdomen Itanded pale yellow and black. Head broader than long, 

 inner orbits pai'allel, clypeus and lower part of sides of face with sparse punc- 

 tures, vertex finely rugulose ; pubescence of head, as also thorax, scattered white ; 

 mandil)les pale yellowish, rufous at tips; labrum projuineut, black; clypeus 

 shaped something like a cocked hat, shiny, dull white, with very conspicuous 

 black marks on its disc, i. e., a pair of broad vertical bars, a little converging 

 above, and not reaching the margin abovti or below, and a spot without each bar, 

 below the level of its middle, thus ■ || • ; small quadrangular patch between 

 upper edge of clypeus and the antennse, and a more or less triangular patch on 

 each side between clypeus and lower front edge of orbit dull pinkish ; the latter 

 pinkish patch extends along orbit about as far as the level of the insertion of the 

 antenuse, but along clypeus only about as far as the black spot; ridge between 

 antennae distinct. Anteunse above blackish, below yellow, the last joint more or 

 less truncate ; collar, tubercles, and a band on upper edge of prothorax broadly 

 interrupted in the middle yellowish white ; me.sothorax shining, rugulose, very 

 sparsely punctured, median groove distinct; scutellum rather more closely punc- 

 tured ; metathorax bluish-green or bluish, contrasting with the brassy green 

 mesothorax, scutellum and post-scutellum ; upper part of metathorax shiny. 



