16 Mr. F. Walker on some Chalcidites of North America. 



very long, reaching when at rest to half the length of the sheaths of 

 the oviduct ; nervures piceous ; humerus much less than half the 

 length of the wing ; ulna much shorter than the humerus ; radius 

 hardly longer than one-sixth of the ulna ; cubitus half the length of 

 the radius ; stigma small, emitting a very short branch. 

 Parasitic on Cecidomya communis, Barnston's MSS. 



Lamprotatus Diaeus, fern. Mneus, antennis nigris, pedibus rufis, 

 femoribus viridibus, alls limpidis, (Corp. long. lin. 1 ; alar. 

 lin. If.) 



Body convex, aeneous : head and thorax finely squameous : 

 head transverse, short, a little broader than the thorax : antennae 

 black, subclavate, a little shorter than the thorax ; first joint long, 

 slender, aeneous ; second cyathiform, aeneous ; third and fourth joints 

 very minute ; fifth and following joints to the tenth transverse, suc- 

 cessively shorter and slightly increasing in breadth ; club conical, 

 more than twice the length of the tenth joint : thorax elliptical : pro- 

 thorax transverse, very short, rounded in front, much narrower than 

 the mesothorax : scutum of the mesothorax broad ; sutures of the 

 parapsides very distinct, approaching each other ; axillae large, tri- 

 angular, not conniving ; scutellum narrow, somewhat rhomboidal : 

 metathorax transverse, very short : propodeon transverse, obconic, 

 decumbent : podeon very short : abdomen elliptical, slightly keeled 

 beneath, a little narrower but not longer than the thorax ; metapo- 

 deon occupying less than one-third of the dorsum ; octoon not half 

 the length of the metapodeon ; ennaton shorter than the octoon ; de- 

 caton a little longer than the ennaton ; protelum and paratelum each 

 as long as the decaton ; telum very short ; ventral segments hidden 

 by those of the dorsum : oviduct concealed : legs dull red ; coxae 

 aeneous ; thighs aeneous green ; mesotarsi and metatarsi pale red, 

 their tips fuscous : wings limpid ; nervures fuscous ; humerus much 

 less than half the length of the wing ; ulna not more than half the 

 length of the humerus ; radius longer than the ulna ; cubitus much 

 shorter than the ulna ; stigma small, emitting a short branch. 



Pteromalus puparum, Linn. &c. 



Female. — Scales of the scutellum more minute than those of the 

 scutum of the metathorax : propodeon having a rim on each side : 

 abdomen oval, concave above, pilose towards the tip ; metapodeon 

 smooth, occupying more than one-third of the dorsum ; octoon of 

 moderate size, very minutely squameous, as are all the following 

 segments ; ennaton shorter than the octoon ; decaton shorter than 

 the ennaton ; protelum, paratelum and telum of equal length, each a 

 little longer than the decaton ; dorsal segments hiding those beneath 

 the abdomen, leaving a passage for the oviduct. 



Reared from the pupa of Vanessa Cardui by Mr. Barnston. This 

 insect inhabits Europe, and has been found in Finmark, within the 

 Arctic circle. It is a means ordained by Providence to counteract 

 the otherwise too great increase of butterflies belonging to the genera 

 Pontia and Vanessa. 



