NO. 2261. NEW REARED PARASITIC IIY3IEW0PTERA--GAII AN. 115 



Family ALYSIIDAE. 

 Subfamily Dacnusinae. 



DACNUSA IRIDICOLA, new species. 



Female. — Length 3 mm. This species is close to D. laeviceps 

 Cresson, but is readily distinguished because of the much shorter 

 ovipositor, the narrower and differently shaped first tergite, as well 

 as by the differently colored abdomen; distinguished from confusa 

 Ashmead by the prominent ovipositor and the noncrenulate sternauli. 



Head, thorax, and abdomen black, the latter sometimes faintly 

 piceus ; antennae, mouth parts, and legs, including all coxae, reddish 

 testaceous, the antennae apically brownish ; wings hyaline, the stigma 

 and nervures brownish. Head perfectly smooth and polished; an- 

 tennae 33-jointed in the type, the first joint of the flagellum about 

 four times as long, as thick, and distinctly longer than the second 

 joint; mandibles 4-toothed, there being a somewhat smaller tooth 

 between the large median tooth and the ventral one ; distance between 

 the eyes at antennae about equal to median line from antennae to 

 apex of clypeus; mesoscutum shining, faintly sculptured and hairy 

 anteriorly, polished with sparse hairs posteriorly, parapsidal grooves 

 represented by a short shallow strongly curved groove at the an- 

 terior lateral angles; a shallow median longitudinal groove divides 

 the praescutum and terminates in front of the scutellum in a deep 

 fovea; sternauli deeply impressed, extending from the anterior to 

 the posterior margin of the mesopleura and perfectly smooth ; meta- 

 notum with a strong median carina; propodeum densely pilose, 

 rugose with a distinct median longitudinal carina; stigma of fore- 

 wing extending a little beyond the middle of the radial cell, not as 

 broad at the insertion of the radius as the length of the first abscissa 

 of radius, the latter about equal in length to the intercubitus ; second 

 abscissa of cubitus very short ; first brachial cell closed at apex ; hind 

 coxae unusually hairy at base above; abdomen about equal to the 

 head and thorax in length; the first tergite rugose, hairy, with a 

 distinct median longitudinal carinae on its anterior half at least, 

 the segment widest at the spiracles which are slightly before the 

 middle, its apex broader than its base, and its length nearly twice 

 its greatest width ; other tergites all smooth and polished ; ovipositor 

 sheaths very slightly curved upward, rather broad, subequal in length 

 to the first tergite and extending beyond the apex of abdomen ap- 

 proximately one-third the length of the first tergite; the ovipositor is 

 straight and very slender; hypopygium rather large and prominent, 

 extending to the apex of pygidium or nearly and in dried specimens 

 forming with it a large mouth-shaped opening. 

 Type-locality. — Middleburg, Pennsylvania. 



