NO. 1730. 



VEW PARASITIC TIYMEXOPTERA CRAWFORD. 



89 



This genus differs from the genus Who pus by being metallic, by having 

 the antennae similar in both sexes, the bead robust, and by the shorl 

 marginal fringes of anterior wings. The genus Metallon is described 

 as having rudimentary wings and the axillae slightly separated. 



Till" of genus. — P. insidiosus Crawford. 



PSYLLEDONTUS INSIDIOSUS, new species. 



Femali and male. -Length 1 mm. Head and thorax somewhat 

 purple; the scutellum bright bluish-green; eves large, distance 

 between them greatly less than length of scape; face well produced 

 below the eyes; face above finely reticulate; mesonotum finely 



FlG. 3.— PSYLLEDONTUS INSIDIOSUS, 

 ADULT FEMALE. 



FlG. 4.— PSYLLEDONTUS INSIDIO- 

 SUS, ANTENNA OF I EMA I E. 



reticulate; the scutellum elongate, triangular, finely longitudinally 

 rugulose; wings hyaline, strongly iridescent; legs black, femora at 

 bases and apices, tips of tibia?, .and tarsi almost entirely, light yellowish. 



Type-locality. — Geneva, New York. Bred from nymphs of the 

 pear psylla. 



P. J. Parrott, collector. 



Type.— Cat, No. 12782, U.S.N.M. 



PLAGIOMERUS, new genus. 



Metallic; antennae 9-jointed, the funicle 4-jointed, the first two 

 joints transverse, pedicel elongate, much longer than joints one and 

 two of funicle together, no ring joint apparent; labrum not prom- 

 inent; eyes strongly convergent above; antennae inserted below the 

 level of the eyes; vertex without thimble-like puncture-, ornamented 

 with two bristles; axillae meeting along the median line: scutellum 

 at apex with a cluster of flattened scales; wings hyaline; marginal 

 vein not punctiform, as long as the stigmal, postmarginal distinct: 

 abdomen flattened above, sheaths of ovipositor subexerted. 



Homalopoda Howard has the vertex with thimble-like punctures; 

 the wings dusky with hyaline spots; the pedicel hardly longer than 

 wide, the first two joints of the funicle subquadrate, as long as the 

 pedicel, the last two slightly longer. 



Cercobdus Walker is said to have the abdomen elongate com- 

 pressed: the pedicel elongate, the first joint of the funicle longer than 

 wide. 



Tyj>< of genus. — Plagiomerus </i<isj<i</is Crawford. 



