274 CHARLES A. BLAKE. 



This may be distinguished by the uniform dark chestnut brown 

 c()h)r,.the ek)ngate abdomen and the singular neuration of the wings. 



Pliotoi>8i»$ glabrella Cresson. 



3Iale. — Uniform obscure honey yellow, very smooth and polished, clothed with 

 a thin, pale yellowish pubescence: head black, with fine scattered punctures; 

 eyes very large and prominent, entire and rounded; ocelli also large and promi- 

 nent; clypeus and mandibles obscure honey yellow, the former very transverse 

 and much depressed ; the mandibles large, broad, the upper margin sinuate and 

 acutely carinate, the apex with three short, obtuse, blackish teeth ; antennje. 

 longer than the head and thorax, filiform ; thorax rather broad in front, with 

 thin, subappressed, yellowish sericeous pubescence ; prothorax sunken, not promi- 

 nent; mesothorax large, rather broadly margined anteriorly and on each side 

 over the tegulfe a finely impressed longitudinal line, the surface polished, with 

 a few scattered delicate punctures : scutellum smooth, with a few long pale hairs ; 

 pleura rather closely punctured, very prominent on the sides and beneath and 

 behind it a very deep, oblique excavation ; metathorax very finely sculptured, 

 subopaque, subquadrate, abrupt on the sides and behind with a long, thin, pale 

 pubescence; wings ample, hyaline ; nervures fuscous, stigma moderate, blackish ; 

 marginal cell very short, scarcely more than half the length of the stigma the 

 apex appendiculated and subacute, the lower nervure more robust than the 

 upper; three distinct submarginal cells, the first as long as the stigma, much 

 narrowed at tip; the second small, triangular, receiving the first recurrent ner- 

 vure near the base, which is pointed ; the third submarginal rather large, quad- 

 rate and receiving the second recurrent nervure about the centre; legs color of 

 the body, thinly pubescent, the tibife and tarsi paler ; abdomen elongate ovate, 

 pointed at apex, petiolated, clothed with a long yellowish pubescence, more dense 

 towards the apex ; first or petiole segment very slender at base and greatly 

 swollen behind the middle and subglobose ; posterior margins of the segments 

 depressed or broadly margined. Length 11 mm. ; expanse of wings 17 mm. 



Hab. — Colorado. 



Closely allied in form and color to P. nubecula, but may be at 

 once distinguished from that species by the smoother surface of the 

 body, the black head, hyaline wungs and the shape of the metathorax. 



Photopsis hyalina Blake. 



Male. — Uniform honey yellow; head subquadrate, posterior angles rounded, 

 finely punctured ; eyes large, prominent ; antennse x^ale honey yellow ; mandi- 

 bles black at tips; thorax elongate quadrate, finely punctured, mesothorax with 

 two faintly impressed longitudinal lines ; metathorax roundly truncate, coarsely 

 reticulate ; teguliE small, pale yellow ; wings hyaline, faintly iridescent, marginal 

 cell ovate, first submarginal small, narrow; second short, obliquely subquadrate, 

 receiving the recurrent nervure near the base, stigma prominent; legs pale 

 honey yellow; abdomen ovate, narrowed to apex, shining, finely punctured, 

 basal segment campanulate, apical margins of segments fringed with silvery pu- 

 bescence; entire insect sprinkled with pale hairs. Length 5.5 mm. ; expanse of 

 wings 9 mm. 



Hab.— Texas. Mr. Belfrage. 



