NORTH AMERICAN HYMENOPTERA. 265 



low : legs honey yellow, clothed with long pale hairs ; ahdomen dark honey 

 yellow, elongate ovate, petiolate, thinly clothed with erect, pale yellowish hairs ; 

 petiole pyriform, much narrowed at base, coarsely punctured, second segment 

 coarsely and deeply punctured, polished; apex somewhat more densely clothed. 

 Length 12 mm. ; expanse of wings 18 mm. 



Hab. — Arizona. 



This species is allied to P. albipes Cresson, but is easily separated 

 by the black head. 



Subdivision I. 



Wings with three submarginal cells. 



Photopsis imperialis Blake. 



Male. — Head black, rounded, finely punctured, thinly clothed with scattered 

 whitish hairs ; eyes round, polished, prominent ; antenna? piceous, as long as the 

 head and thorax ; thorax ovate, dark ferruginous above, closely punctured, disc 

 of mesothorax with two longitudinal impressed lines, scutellum blackish, finely 

 punctured, metathorax roundly truncate, coarsely reticulate, dorsal groove not 

 extending to the middle, sides coarsely punctured ; wings ample, basal half 

 hyaline, apical half pale fuscous, marginal cell elongate ovate, three submarginal 

 cells, first narrow, second obliquely subquadrate, pointed towards base, its basal 

 and apical nervures sinuate, receiving the first recurrent before the middle, third 

 narrowed beneath, so that its apical nervure is opposite to and joins the second 

 recurrent ; legs black, thinly clothed with silvery hairs, calcaria reddish ; ab- 

 domen ovate, petiolate, basal segment pyriform, coarsely punctured, thinly 

 clothed with erect silvery hairs ; second and following segments brownish, finely 

 punctured, the apical margins clothed Avith reddish golden pubescence ; under 

 side same as above. Length 13 mm. ; expanse of wings 23.5 mm. 



Hab.— Texas. 



Photopsis contracta Blake. 



Male. — Uniform bright ferruginous, thinly clothed with erect hairs; head 

 rounded, as wide as thorax : eyes round, prominent ; flagellum of antennas 

 slightly pruinose ; upper edges and tips of mandibles blackish ; thorax ovate, 

 rounded posteriorly, minutely punctured, mesothorax with two faintly impressed 

 lines, scutellum rounded, metathorax abruptly truncate, reticulate ; wings fus- 

 cous, marginal cell short, ovate, first submarginal long, narrow, second subtrian- 

 gular, its apical nervure sinuate and receiving the first recurrent near the middle, 

 stigma small, fuscous : tegulse dark honey yellow ; legs thinly clothed with scat- 

 tered hairs ; abdomen ovate petiolate, short, shining ; apical margin of petiole 

 blackish, margins of remaining segments fringed with ferruginous pubescence. 

 Length 9 mm. 



Hab. — Nevada. 



Photopsis eoiHolor Cresson. 



Male. — Uniform honey yellow, polished, clothed with a thin, long, whitish 

 pubescence ; eyes large, round, entire and prominent, as well as the ocelli, which 

 are enclosed by a blackish spot ; antennas long, honey yellow, the flagellum 



TRANS. AMER. ENT. SOC. XIII. (34) SEPTEMBER, 1886. 



