Mr. F. Walker on some British Chalcidites. 183 



versely just behind the scutellum : propodeon transverse, of moderate 

 size, narrower behind, slightly decumbent, having a little ridge along 

 its disc, and a rim on either side : podeon extremely short : abdo- 

 men flat, concave, smooth, shining, nearly linear, narrower and 

 much shorter than the thorax ; the segments minutely squameous ; 

 metapodeon occupying about one-third of the dorsum ; octoon, 

 ennaton, decaton and protelum of moderate and nearly equal size ; 

 paratelum short ; telum very short : legs rather short and stout ; 

 the mesotibiae and metatibiae have two spines at their tips, the pro- 

 tibiae only one : wings moderate ; humerus much less than half the 

 length of the wing ; ulna less than half the length of the humerus ; 

 radius as long as the ulna ; cubitus very long, a little shorter than 

 the radius, slightly curved ; stigma very small, emitting a short 

 branch. 



Female. — Head as broad as the thorax : antennae subclavate, as long 

 as the thorax ; first joint slender, very long ; second long-cyathiform ; 

 third and fourth very minute ; fifth and following joints to the thir- 

 teenth short, closely joined together, in form like a long spindle 

 which is about equal in length to the four preceding joints ; club 

 conical, more than twice the length of the tenth joint : abdomen 

 round, concave, sculptured like that of the male, shorter but not 

 narrower than the thorax ; metapodeon occupying more than one- 

 third of the dorsum ; octoon and following segments to the protelum 

 of moderate size, successively but slightly decreasing in length ; 

 paratelum and telum very short : sternum, coxae and thighs scaly 

 like the thorax : abdomen slightly keeled ; dorsal segments passing 

 underneath, not conniving nor contracted, but leaving a space be- 

 tween them where the ventral segments appear ; these latter are 

 equal in number to those of the dorsum, but unlike them successively 

 increase in length from the base to the tip of the abdomen ; along 

 the last there is a channel from the base of which the oviduct 

 emerges, but it does not extend beyond the abdomen. 



In the month of May the leaves of the apricot-trees in my garden 

 were eaten by multitudes of the larvae of caterpillars of Lozotcenia 

 Xylosteana. The moth appeared in the middle of June, and shortly 

 afterwards some of the pupae disclosed an abundance of Pteromalus 

 domesticus. In number the males were to the females in the propor- 

 tion of two to five. In the following year the moth appeared again, 

 but attacked the pear-trees instead of the apricot-trees. It was not 

 infested by the Pteromalus, but I reared two other insects from the 

 pupae, one belonging to the Ichneumonidce, the other a species of 

 Tachina. Like two other species, Pt. muscarum and Pt. tenuis, the 

 females are found on windows throughout the year ; they sometimes 

 appear in great swarms, and are perhaps parasitic on Tortrix viridana 

 as well as on the insect mentioned above. 



Tetrastichus Rapo (Annals of Natural History, vol. i.). In the 

 month of August many insects of this species emerged from the 

 cocoons of Microgaster glomeratus, Linn., that infests the caterpil- 

 lars of Pontia Brassicce. Thirty-eight specimens or more appeared, 

 and the proportion of males to that of females was as one to four, or 

 thereabouts. 



