1882 THE BUTTERFLIES OF NEAV ENGLAJfD. 



giolus, and one was sent by Mr. Scudder, who reared it from the chrysalis 

 of Uranotes melinue. 



Genus MESOCHORUS Gravenhorst. 



Head transverse, short, not buccate. Clypeus not distinguishable. Byes oblong- 

 ovate. Antennae about as long as body, setose. Metathorax with a straight, superior 

 area. Abdomen oblong-fusiform; first segment slightly curved, spiracles almost in 

 the middle ; last ventral segment with the female rather large ; anal stylets of the male 

 rather long, filiform ; terebra of the female exserted for a short distance. "Wings 

 •with a rather large rhomboidal, areolet. Legs moderate or slender. (After Holm- 

 gren.) 



The species of Mesochorus are without doubt often hyperparasites ; 

 whether always so we cannot say with certainty. 



Table of Species. 



Thorax entirely black pierldicoliis. 



Thorax entirely yellow, or marked with yellow-brown scitulus. 



Mesochorus pieridicolus (Packard). 



Campoplex pieridicola Packard. 



Female.— Black : head black on the vertex and occiput; orbits and front below the 

 antennae bright yellow ; a slight reddish tinge in the middle. Palpi pale honey-yellow. 

 Antennae brown, pale yellowish at base, second joint pale brown above, third yellow, 

 fourth and fifth pale yellowish brown, and thorax shining black, with fine, white, ap- 

 pressed hairs. Metanotum full, rounded, smooth, and polished, with a narrow mesial 

 ridge. Tegulae and base of wings pale greenish-yellow. Wings clear ; stigma pale 

 brown; veins concolorous; areolet rather large, rhomboidal. Legs, including the 

 coxae, honey-yellow; tarsi of fore and middle legs dusky towards the claws, those of 

 the hind legs a little dusky, except on basal two-thirds of first joint, and growing 

 darker toward the claws. Abdomen long and narrow, compressed towards the end, 

 with a minute, slender ovipositor, not quite so long as the abdomen is wide, shining 

 black with a yellowish band in the middle, the posterior edge of the second and anterior 

 two-thirds of the third segment being yellow. There is a yellow dot at the end of the 

 pedicel, being an extension of the pale yellow under surface of the three basal seg- 

 ments; end of abdomen obliquely truncated. Length, 4 mm. (After Packard.) 



Dr. Packard described this species from a single specimen, and I have 

 seen only his type. The specimen is labelled : " From Pieris rapae," and 

 this is all the information which we have concerning it. It may or may 

 not be a secondary parasite. 



Mesochorus scitulus Cresson. 



Male, Female.— VaXe honey-yellow or luteous ; head broiid ; spot covering ocelli, and 

 tips of mandibles black ; occiput of ? more or less fuscous ; antennae long and slender, 

 pale testaceous, sometimes slightly dusky, scape paler; mesothorax fuscous in ?, 

 honey-yellow with dusky sides in $ ; scutellum and region honey-yellow ; disk of 

 metathorax more or less blackish or fuscous; tegulae pale luteous; wings hyaline, 

 irridescent, uervures and stigma luteous; legs pale luteous, apex of posterior tibiae 

 and tips of tarsal joints dusky; abdomen fusiform, very slender at base, black above, 

 with a large, discal, pale luteous spot covering apical half or two-thirds of second 



