74 BIOLOGICAL SOCIETY OF WASHINGTON. 



erately wide and long; petiolus cubiti a little more than half as long as the stem 

 of first fork, and fully three times shorter than the discoidal part of subcosta, 

 which is distinctly longer than the basal portion ; radius nearly parallel to stem of 

 second fork and fourth furcal, hardly curved upward at terminus, furcals termi- 

 nating very obliquely upon the margin, third and fourth nearly equal in length, 

 second very little longer than third, and first very little shorter than third, and 

 terminating at about the middle of the margin ; stem of second fork as long as third 

 furcal ; tip of wing between radius and fourth furcal ; outer basal cell one-third 

 shorter than radial cell, marginal cells of equal length, the second a little wider 

 than the first. Metasternal processes pale greenish, cylindrical, hardly narrowed 

 toward the tip, which is obtuse, not pointed. Legs pale brownish-yellow, femora 

 usually variegated with black, last tarsal joint blackish. Abdomen either entirely 

 blackish or brown, or brownish-yellow, in fresh specimens, suffused in pink. 



1^ : genital segment a little longer than the preceding ventral segment, brown, 

 shining; plate as high as the length of the segment, lateral lobe barely indicated, 

 anterior margin straight, posterior margin very slightly oblique, i, e., the plate 

 gradually increases in width toward the tip, which is truncate and not arcuate, as 

 in the preceding species. Forceps as in veiiusta. 



9: genital segment a little shorter than the three preceding ventral segments to- 

 gether, laterally more compressed than in venusta; upper plate a little longer than 

 the lower one, gradually tapering toward tip, which is straight and not so sharply 

 pointed as in veniista; lower plate also simple. 



Described from numerous specimens bred from closed mamma- 

 like galls on leaves of Celtis. • 



Pachypsylla (Blastophysa) c. -gemma, new species. 



Average length 3.5 mm. Glossy. Dark brown or lighter, head and thorax 

 dirty brownish-yellow or deep gamboge-yellow, with greenish and often reddish 

 tint; front vv'ings uniformly yellowish-brown (lighter or darker) ; abdomen nearly 

 black, sutures of the segments reddish, often the whole abdomen brownish-yel- 

 low. Head vertically inclined, as in the other species, with the eyes a little nar- 

 rower than the widest part of the thorax ; vertex shining, rugoso-punctate, yellow- 

 ish-gray, twice as wide as long, not narrowing anteriorly, very slightly emarginate 

 posteriorly, anterior margin straight, discoidal impressions large, foveiform, but 

 shallow and ill-defined; median line fine; frontal cones vertical, somewhat vari- 

 able in form, but usually subtransverse, always rounded at tip, more or less 

 strongly divergent, rugoso-punctate, slightly hairy ; antennas fully as long as the 

 width of the head, less stout than in the other species of the genus, yellow, 

 more or less variegated and tipped with black ; joints subtui'binate, joint 4 not 

 quite one-half as long as 3, the succeeding joints a little shorter than 4, but not 

 decreasing in length, 9 and 10 closely united and together shorter than the pre- 

 ceding joint; terminal liristles very short; pronolum very short, of equal width, 

 slightly emarginate behind, shining, impunctate ; dorsulum formed as in other 

 species, usually shining, finely alutaceous, with sparse transverse aciculate lines, 

 which are sometimes absent; mesonotum formed as in other species, shining, very 

 finely alutaceous; color of dorsulum and mesonotum very variable, usually 

 brownish- vellow with greenish tinge, or yellowish-green with more or less indis- 

 tinct markings of light brown ; sometimes the color is more decidedly yellow, or 

 even orange yellow, or nearly wholly pale green. Wings glossy, decidedly 

 shorter and more leathery than in the other species, decidedly sub-convex, at 

 basal third very slightly wider than at terminal third, transversely rugose, uni- 

 formly immaculate, costal margin at base strongly arched, then nearly straight, tip 

 of wingly broadly rounded, inner margin regularly curved ; venation much less 

 prominent than in the genuine Pachypsyllas ; pterostigma very indistinct ; petio- 

 lus cubiti about half as long as the discoidal part of the subcosta, which is as long 



