AMERICAN PSYLLIDAE H 355 



from near posterior margin and closer to median suture tiian to posterior 

 ocelli toward lower margin of eyes ; sulcas connected posteriorly by a shal- 

 lower transverse sulcus ; frontal plates not raised plate-like ; vertex distinctly 

 emarginate anteriorly at median suture, making anterior ocellus visible from 

 above. Facial cones moderately long scarcely divergent, acute at tips, sub- 

 horizontal and visible from above, slightly pubescent. Antennje inserted on 

 frons between lower margin of eye and base of facial cone on each side ; 

 two basal segments large, not globose, the remaining segments filiform. 



Thorax somewhat arched, slightly punctate. Pronotum very short, de- 

 pressed below dorsulum and head, ascending toward dorsulum, with a fovea 

 on each side just above episternum. Dorsulum ascending strongly, triangular, 

 roundly pointed anteriorly. Wings hyaline, moderately slender, about two 

 and two-thirds times as long as broad, broadest across first furcal, quite 

 acute apically ; radius distinctly shorter than second cubital ; second marginal 

 cell smaller than first ; second cubital terminating at apex of wing. 



Female. — Abdomen darker in color than thorax. Genital segment long, 

 almost as long as rest of abdomen, distinctly deflexed : dorsal plate slender, 

 quite acute, overreaching ventral plate and receding farther back basally ; 

 genital pore large, elliptical, conspicuous ; pubescence very light and sparse. 

 Male. — Abdomen more slender than in female. Genital segment longer than 

 two preceding, quite stout, tapering toward tip ; claspers simple, curved in- 

 ward and slightly serrated apically ; anal segment produced dorsally into a 

 large, broad double projection, bilobate when viewed from the side, with a 

 more or less distinct ridge extending from the base into each lobe ; posterior 

 lobe, viewed from behind, with two recurved f^aps ; upper rim of projection 

 bordered with a fringe of about twenty-four long hairs ; pubescence sparse but 

 moderately conspicuous. (In the accompanying illustrations the claspers are 

 shown as partially enclosed and held by anal projection, which may or not 

 be the natural position for them in all specimens.) 



Described from two females and three males in the C. F. Baker collection, 

 taken in Colorado. Type specimen in National Museum. 



Trioza albifrons n. sp. 



(Figs. 128 T: 129 F; 130 M.) 



Length of body. 2.0 mm. ; length of forewing, 3.0 mm. ; greatest width, 

 1.3 mm.; width of vertex between eyes, .38 mm.: with eves, .60 mm. General 

 color, yellowish green to greenish white, abdomen ventrally darker, apical 

 half of antennae and middle tarsi black. 



Head slightly deflexed, with eyes fully as broad as thorax, coarsely 

 l)unctate ; posterior margin of vertex arcuate, not emarginate at median suture, 

 scarcely elevated ; discal area with fovea on each side between median suture 

 and posterior ocelli near posterior margin ; depression scarcely sulcate ; vertex 

 roundly emarginate anteriorly at median suture ; anterior ocellus barely visible 

 from above. Facial cones rather short, stout at base, acute, quite divergent, 

 subvertical but slightly upcurved and partially visible from above, sparselv 



