22 PEOCEEDINGS OF THE NATIONAL MUSEUM. vol.61. 



be settled by a study of the types of P. dickensi which are in Aus- 

 tralia. Until this is done the present name is best retained. 



Female. — Length 0.6 mm. Head and thorax under high magnifi- 

 cation apparently granularly sculptured, the head more distinctly so; 

 ocelli in a low triangle, the lateral ocelli distant from the eye margin 

 by approximately the diameter of an ocellus; antennae short, the 

 scape subcylindrical and apparently a little shorter than the club; 

 pedicel rather thick and very slightly longer than broad; ring joint, 

 if one is present, exceedingly minute and more or less invaginated; 

 fourth joint of antenna as thick as the pedicel, strongly transversely 

 wedge-shaped, the dorsal margin longer than the ventral margin; 

 fifth joint as long as the scape or nearly, acuminate at apex, with an 

 obsolescent suture indicated slightly beyond the middle; parapsidal 

 grooves deep and distinct ; praescutum large, about as broad as long ; 

 parapsides small ; scutellum transverse, fully twice as broad as long, 

 the apex rounded ; axillae lying almost wholly in front of the groove 

 separating praescutum and scutellum; forewing rather short and 

 broad, and almost squarely truncate at apex, rounded only at the 

 posterior apical angle; marginal vein as long as the submarginal; 

 stigmal vein thickened and consisting of a shortly petiolated knob 

 with a distinct thumb-like uncus on its anterior margin; postmarginal 

 obsolete but the anterior margin of the wing beyond the stigmal 

 vein and extending to the wing apex thickened and covered with cilia 

 similar to those on the marginal vein ; disk of wing mostly bare of 

 cilia except for a row of from two to four hairs running from the 

 apex of stigmal vein to the apical margin of the wing and another 

 short row of from two to four rather conspicuous pores close to the 

 posterior margin at the posterior apical angle of the wing ; marginal 

 cilia beginning at the anterior apical angle and extending around to 

 the posterior angle, these hairs a little more than one-third as long as 

 the greatest wing breadth and nearly uniform in length; posterior 

 margin of wing without cilia ; posterior wing rather sharply rounded 

 at apex and bare of discal cilia except for three or four hairs on the 

 apical middle, its marginal cilia approximately twice as long as the 

 wing breadth, starting at a point on the anterior margin about mid- 

 way between the apex of the venation and the wing apex and extend- 

 ing around the apex and on the posterior margin nearly to the base 

 of wing ; legs moderately stout, the femora slightly swollen, the apical 

 tarsal joint a little the longest of the tarsal joints; tibial spurs dis- 

 tinct; abdomen about as long as the head and thorax, broadly sessile, 

 narrowing gradually toward the rounded apex, the ovipositor wholly 

 concealed from above and about equal to half the length of abdomen. 

 Head, thorax, and appendages pale yellow, the abdomen black ; wings 

 distinctly infuscated from the base to a little beyond the apex of 



