THE CANADIAN ENTOMOLOGIST, 135 



darker spots ; 2nd antennal joint slightly reddish ; tips of mandibles 

 brown, palpi whitish ; wings hyaline, iridescent, ligaments of wings brown, 

 stigma brown black, a large dark blotch extending from stigma across to 

 near the hind margin, and in some specimens a slight indication of another 

 blotch between this and base of the wing ; abdomen smooth and shining, 

 very slightly infuscated on dorsum; a brown spot at base of posterior 

 coxae ; outer surface of posterior femora dark brown excepting at base 

 and tip, inner surface more of a reddish brown. 



Described from 8 specimens, 2 ^ and 6 ^ , bred from an oak gall 

 ( Cynips q. Jims Fitch ?) 



Decato.ma querci, n. sp. — ^. Length .12 inch. Head green, 

 slightly yellowish and coarsely punctate, vertex enclosing ocelli brownish 

 black, mandibles tridentate, tipped with black, gula black ; eyes greenish 

 brown with darker spots ; antennae 7-jointed, pubescent, greeni.sh yellow, 

 3rd joint dark ; thorax coarsely punctate and slightly hairy ; collare trans- 

 verse quadrate, but broader than mesonotum, greenish yellow, with a slight 

 darker transverse band of brown in centre ; mesonotum, scutellum and 

 metathorax dark reddish brown ; parapsidal grooves indistinct ; scutellum 

 longer than broad and posteriorly rounded ; abdomen smooth, shining 

 black or brownish black, more or less of a reddish brown anteriorly, 

 peduncle two-thirds as long as abdomen, black ; wings hyaline, veins hya- 

 line, stigma black, with a brownish black blotch extending from it to more 

 than half way across the wing ; legs, anterior pair greenish yellow, middle 

 tibiae infuscated, posterior tibiae brownish black, tarsi black. 



Raised from a dipterous gall on QiiercUs Catesbcei. 



Decatoma LAN.t, n. sp. — $. Length .08 to .10 inch. Honey yel- 

 low. Head finely punctate, thorax coarsely punctate ; a small black spot 

 on vertex hardly enclosing ocelli, the latter yellowish ; tip of mandibles 

 black ; antennae 8-jointed, honey yellow and gradually increasing in size 

 to tip ; collare narrow \ scutellum somewhat oval, narrowed anteriorly and 

 with the disk brown ; abdomen yellowish red, dorsum infuscated, peduncle 

 short, posteriorly brown or black ; wings hyaline, stigma black and the 

 blotch smoky and hardly extending half way across the wing ; legs yel- 

 lowish, posterior tibiae only black or brownish black. 



^ . Differs very little from above excepting in size, a longer peduncle 

 and in antennae being but 7-jointed. 



Described from numerous specimens raised from a woolly gall (Cynips 

 q. Tunierii Ashmead) on Qiieixui aqicatica. 



