246 [April 



ininent ; a small spot at the base of each antenna within, a minute dot 

 on the inner orbit near the summit of the eyes, the clypeus, labrum. 

 mandibles except tips, lower half of cheeks, and the palpi, white; an- 

 tennae as long as the head and thorax, rather slender, entirely black, 

 third joint one-fourth longer than the fourth, the fourth and fifth equal 

 in length, remaining joints shorter, subequal, gradually attenuated. 

 Thorax shining black, minutely sculptured ; the broad upper, and nar- 

 row lower margins of the prothorax, a large broad mark on each side 

 of the pleura, and most of the two spaces on each side between and 

 above the four posterior coxae, white ; postscutellum deeply punctured, 

 with a minute white dot on each side ; tegulaa white. Wings ample, 

 pale yellowish-hyaline, iridescent; nervures blackish, yellowish at base 

 as well as the costa and base of stigma. Legs whitish ; the femora and 

 tibiae behind, especially at tips, black ; tarsi ochraceous. Abdomen 

 shining; the basal half above black, white on each side, remaining seg- 

 ments ferruginous; venter whitish, tinged with ferruginous at tip; ovi- 

 positor whitish, sheaths black. Length 5$ lines; expanse of wings 11 

 lines. 



Male. — More slender than the female, the antennas a little longer, 

 the pleura entirely white, the base of the abdomen blackish, and the re- 

 maining segments honey-yellow, the apical ventral segments tinged with 

 the same color; the wings have a very faint tinge of yellowish. Length 

 4J lines; expanse of wings 9£ lines. 



One 9 , one % , specimens. 



Genus LYDA, Fabr. 



1. Lyda brunnicans, Norton. 



Lyda brunnicans, Norton, Proc. Ent. Soc. Philad. iii, p. 15. 



One $ specimen. 



2. Lyda multisignata, Norton. 



Lyda multisignatus, Norton, Proc. Ent. Soc. Philad. iii, p. 15. 

 One 9 specimen. 



3. Lyda cavifrons, n. sp. 



Black; face, mouth, outer orbits, tegulse and legs, pale luteous ; wings fusco- 

 hyaline; face concave. 



Female. — Shining black; head with a deep longitudinal furrow on 

 each side of the ocelli, extending from the base of the antennae to the 

 occiput, connected by a cross furrow just behind the ocelli ; face con- 

 cave, the margins prominent, subcarinate, with a longitudinal ridge on 

 the middle of the clypeus ; the face, two spots above the base of an- 

 tennae, clypeus, labrum, mandibles, palpi, lower inner orbits, the outer 

 orbits, interrupted in the middle and extending on each side behind 



