464 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 53. 



hind ar.gles, the basal median area complete, the pleural carinae weak; 

 legs slender, front tibiae slightly swollen, hind tarsi longer than their 

 tibiae by about the length of the last joint, first joint fully as long 

 as the next three together, last longer than third, middle and hind 

 tibiae with scattered spines, each set in a rather large puncture; 

 areolet pentagonal, complete, its sides convergent, lower outer angle 

 of second discoidal cell right, nervellus postfurcal, broken slightly 

 below the middle, abdomen longer than head and thorax, first tergito 

 two and one-half times as wide at apex as at base, minutely shagreen ed 

 dorsally, strongly carinate laterally from base to apex and dorsally 

 from base to spiracles, the latter situated at aboat the posterior two- 

 fifths; tergites 2 to 4 densely, minutely punctate, the rest subpohshed; 

 ovipositor scarcely half as long as abdomen, stout. 



Black, with first three and part of fourth abdominal segments and 

 the legs (mostly) ferruginous, front coxae in front, front and middle 

 trochanters above and hind tibiae and tarsi more or less infuscate, 

 the tarsi, excapt last joint, much paler than the tibiae; v/ings hyaline, 

 veins and stigma brown, the latter with a small white spot at base; 

 antennae with an incomplete white annulus on seventh and eighth 

 flagellar joints. 



Male. — Length, 10 mm.; antennae, 8 mm. 



Differs from female as follows: Temples more strongly rounded; 

 pubescence of head and thorax paler and more conspicuous, propodeal 

 carinae weaker; front tibiae not swollen; abdomen more slender, first 

 tergite barely one and one-half times as wide at apex as at base; an- 

 tennae without annulus ; mandibles, palpi, spot on clypeus, lower ante- 

 rior orbits, tegulae, a small spot below, spot on scutellum, front and 

 middle trochanters, third and fourth joints and apical half of second 

 joint of hind tarsi white; front coxae 4)lack in front; red color of ab- 

 domen embracing first five segments. 



Host. — Ametastegia glabrata (Fallen). 



Type-locality. — Wenatchee, Washington. 



Type.— C&t. No. 20776, U.S.N .M. 



A large series shows variation in size among females from 9 to 5.5 

 mm. and among males from 10 to 5 mm. The red color varies 

 from ferruginous to pale testaceous, the paler color generally found 

 in the smaller specimen. In some specimens the coxae are aU red, 

 while in others the front coxae are entirely black. The extent of 

 the infuscation in the hind tibiae is also very variable. In some 

 specimens the white annulus includes portions of the sixth and ninth 

 flagellar joints, while in others it is confined mostly to one joint, the 

 eighth. The white of the hind tarsi of the male is frequently entirely 

 confined to the third and fourth joints. The front coxae in the 

 male vary from almost entirely black to almost entirely red and the 

 trochanters are frequently entirely red. 



