Mr. F. Walker on some Chalcidites of North America. 17 



Encyrtus Bolus, fem. Ater, antennis pedibusque nigris, genubus fuU 

 vis, tarsis piceis, alis albis. (Corp. long. lin. \ ; alar. lin. }.) 



Body black, convex, shining, slightly punctured : head transverse, 

 short, vertical, as broad as the thorax : antennae clavate, black, as 

 long as the thorax ; first joint long, stout ; second cyathiform ; third 

 and following joints to the ninth small, successively shorter and 

 broader ; club fusiform, nearly as long as all the joints from the third 

 to the ninth : thorax elliptical : prothorax transverse, extremely 

 short, not visible above : scutum of the mesothorax large, having a 

 slight channel along its disc ; parapsides united with the scutum ; 

 axillae triangular ; scutellum small : metathorax transverse, very 

 short ; propodeon obconic, declining : podeon extremely short : ab- 

 domen fusiform, concave above, longer and narrower than the thorax : 

 legs black ; knees fulvous ; tarsi piceous ; middle legs having the 

 tibiae and tarsi long and large as usual : wings white, rather small ; 

 nervures fuscous ; humerus less than half the length of the wing ; 

 ulna thick, very short ; radius still shorter than the ulna ; cubitus 

 much longer than the ulna ; stigma small, emitting no branch. 



Reared from a species of Coccus ? that infests willow-twigs. 



Tetrastichus granulatus, fem., Barnston's MSS. Tetrastichus Aga- 

 thocles ? A. N. H. 1. JEneo-viridis, antennis fuscis , pedibus flavis , 

 femoribus viridibus, tibiis nonnunquam fuscis, alis limpidis. (Corp. 

 long. lin. \ — §• ; alar. lin. 1 — 1J.) 



Body aeneous-green, shining, slightly convex, very minutely squa- 

 meous, thinly pubescent : head very short, impressed between the 

 eyes, as broad as the thorax : eyes and ocelli red, one of the latter 

 in advance on a line between the other two: antennae fuscous, clavate, 

 pubescent, shorter than the thorax ; first joint long, slender; second 

 cyathiform ; fourth joint shorter and broader than the third, but 

 longer and narrower than the fifth ; club elliptic, broader than the 

 fifth joint and about twice its length : thorax elliptical : prothorax 

 transverse, very short : scutum of the mesothorax very large, having 

 a slight furrow along the middle ; sutures of the parapsides very 

 distinct, approaching each other ; axillae rather large, not conniving ; 

 scutellum somewhat rhomboidal, having a longitudinal furrow on 

 each side : metathorax transverse, very short : propodeon transverse, 

 rather short, slightly decumbent : podeon extremely short : abdomen 

 oval, depressed, shorter and a little broader than the thorax ; meta- 

 podeon large ; octoon and following segments to the telum succes- 

 sively shorter ? : oviduct concealed : legs yellow ; coxae and thighs 

 green ; tibiae sometimes fuscous ; tips of the tarsi fuscous : wings 

 limpid ; nervures fulvous, not much more than half the length of the 

 wing ; humerus rather short ; ulna as long as the humerus ; radius 

 extremely short ; cubitus long, rather less than half the length of 

 the ulna but more than twice the length of the radius ; stigma very 

 small, emitting a short branch. 



Ann. §• Mag. N. Hist. Vol. xiv. C 



