198 W. H. ASHMEAD. 



Mr. Walsh's descriptions are very full and accurate, but I think a 

 comparison with Dr. Fitch's will convince any reasonable person 

 that all these species are the same ; in my mind there is no doubt, 

 for I have reared the species from the same galls as Dr. Fitch and 

 Mr. Walsh, and from many other galls, and the species cannot be 

 separated. It is a very variable si:)ecies. 



61. Decatoiiia variaiis Walsh. 



This is also an extremel)^ variable species, occurring in various 

 galls, but may always be distinguished from D. querci-lanie by hav- 

 ing a distinct stigmatic cloud. Very many others of the so called 

 species in this genus will probably have to be placed as varieties 

 here. 



62. Deeatoma iiubilistigina Walsh. 



Mr. Brodie has sent me three specimens of Decatomce reared by 

 him from Soleaozopheria vacclmi Ashm., which cannot be separated 

 from this species. 



ISOSO.HA Walker. 



63. Isosonia liordei Han-is. 



Syn. Deeatoma basUaris Prov. 



L'Abbe Provancher's type of this species was sent to me along 

 with other chalcids, but it would hardly have been necessary to see 

 tyjie to correct the synonym, for besides his description agreeing with 

 hoTclei in speaking of the % he says : *' Les antennae ornees de ver- 

 ticelles de longs polls blancs." The % antennse in Deeatoma are 

 ahvays simple, same as the 9 . 



This species is very closely related to the European species Imsoma 

 fframinis Giraud. As. Mr. Walsh has shown it varies greatly in the 

 color of the legs. 



In my Isosoma gigantea rather inappropriately named, for it is by 

 no means as large as many others in the genus, the stigmal vein is 

 distinctly longer than the marginal vein, a character laid down in Mr. 

 Howard's excellent " generic synopsis" for the genus Systole Walk., 

 but the metathorax is gradually sloping, and in shape, etc., it does 

 not differ from typical Isosom,ce. 



Subfamily Tridymin.e. 



METASTENCJS Walker. 



64. I»Ietasteiius(?) acaiifliociiii n. sp.— '^ 9- Leugth .15 to .25 inch. 

 Black, opaque, coarsely grauulately punctate, and sparsely covered with short 

 white hairs. The head is rather broad, with auteunal depression; eyes brown ; 



