78 BIOLOGICAL SOCIETY OF WASHINGTON. 



in the incisure not acute, but very narrowly rounded ; anterior ocellus at the bottom 

 of the incisure only visible from the front, but not readily perceptible ; discoidal im 

 pressions very conspicuous, long, lineiform, reaching the hind margin of the head. 

 Antennse more than twice as long as the greatest width of the head ; joints i and 

 2 longer than usual, joint 3 longer than 4 and 5 together, and at middle distinctly 

 wider than the succeeding joints, but narrower than joint 2. Thorax, with the 

 pronotum moderately short, slightly ascending posteriorly ; front and hind mar 

 gins but slightly curved, the latter, however, narrowly notched at middle ; lateral 

 impressions deep and large, situated at the hind margin ; dorsulum distinctly 

 wider than long, anterior lobe sub-acuminate in middle of front to fit in the emar- 

 gination of the pronotum ; mesonotum of usual form, subdepressed on the disc, 

 convex at the sides, nearly as long as the dorsulum ; metasternal processes small, 

 elongate, pointed at tip. Front wings very long and narrow, more than three 

 times longer than wide, widest at middle, tip distinctly angulated, with the angle 

 more acute than usual, colorless and perfectly transparent, venation fine; basal 

 portion of subcosta nearly as long as the stem of first fork and a little longer 

 than the discoidal and radial portions of subcosta combined ; radius straight and 

 not parallel with stem of second fork ; stem of second fork nearly twice as 

 long as that of the first ; tip of wing distinctly within second marginal cell ; outer 

 basal cell as long as radial cell, which is as long as, or little longer than, the mar 

 gin of the discoidal cell. Anterior legs longer than the others, and with the 

 femora laterally much compressed and curved inwardly. 



The form and venation of the wings do not offer any differences 

 from the Triozinse, and more particularly from certain typical Tri- 

 ozas, while the absence of frontal cones, together with the form of 

 the third antennal joint, seem to point to an affinity with Bacteri- 

 cera, Puton (a genus which is unknown to me in nature). The re 

 markable formation of the head, however, removes Rhinopsylla not 

 only from the other genera of this sub-family, but from all Psyllidse 

 hitherto described. The formation of the anterior legs is also a 

 character not otherwise occurring in the whole family; but this 

 might be a sexual character, as the female is still unknown. 



Rhinopsylla schwarzii, new species. 



Length, 3 mm. Head and thorax dull brick-red, the latter above indistinctly 

 marked with pale yellow ; upper surface opaque, not pubescent, and without other 

 sculpture than the usual very fine alutation. Abdomen greenish, femora red, 

 tibiae and tarsi pale yellow, the former blackish at base. Oblique post-ocular pro 

 longation of the head nearly as long as the anterior portion of the head ; anterior 

 median excision of the vertex forming an almost equilateral triangle ; the two 

 lobes of the vertex formed by the notch are also triangular, and not more porrect 

 than the front margin of the eyes, which are semi-globular and very prominent ; 

 discoidal impressions forming each side a longitudinal line reaching to near the 



