Clje Catiaiian Entomologist, 



VOL. XXI. LONDON, AUGUST, 1889. No. 8. 



IBALIA MACULIPENNIS, HALDEMAN. 



BY W. HAGUE HARRINGTON, OTTAWA. 



The genus to which this very interesting species belongs differs so 

 widely from the rest of the Cynipidae that it has been separated from them 

 as a sub-family, under the title Ibaliince. Its members can be readily 

 recognized by the cultriform abdomen and more strongly veined wings, 

 as well as by their greater size. The cultriform — i. e., knife-shaped — 

 abdomen is in itself remarkable enough to attract the attention of all who 

 may chance to see the insects. 



From Canada two species are recorded : ensiger Nort., % , and 

 maculipennis Hald., % . The former 1 have not yet been able to find 

 here, but Provancher (Faune Ent. Can., IL, 554) records it as frequently 

 seen. Both species were described from the United States (Pa.), with 

 four others : anceps Say. (Ark.), Montana Cress. (Col., $ ), rufipes Cress. 

 (Nev., ^ ), and scapel/ator Westw. (Ga., ^ ). The last is the only species 

 of which the ^ appears to be known. The present species was described 

 by Haldeman (Proc. Acad, Nat. Sci., Phil, IIL, 127) as follows: — 

 " Ibalia ' maadipcnnis $ . — Yellow ; meso and meta-thorax black, except 

 the scutel and two longitudinal bands above, and a spot beneath the 

 wings ; eyes, apex of antennae, base of coxse and middle of femora (the 

 greater part of the posterior ones) black ; posterior tibiae blackish toward 

 the apex ; wings yellow, apex and a central spot fuliginous. Seven lines 

 long, eleven expanse. South-eastern Pennsylvania, in May and June." 



A more detailed description of the % is given by Provancher (Faune 

 Ent. Can. Add., 165), and it is figured in the report of the U. S. Ento- 

 mologist for 1877, but so far as I know there has been published no 

 description of the ^ . It differs from the $ , however, but slightly in 

 general appearance, except in being darker in colour, especially the 

 thorax. The abdomen is nearly straight above, instead of being curved 

 as in the % , and the terminal segments are slightly swollen, so that, 



