THE ENTOMOLOGIST 
Vou. XLVITI.] OCTOBER, 1914. [No. 617 
CONTRIBUTIONS TO OUR KNOWLEDGE OF THE 
BRITISH BRACONIDAL. No. 2—MACROCENTRIDA, 
WITH DESCRIPTIONS OF TWO NEW SPECIES. 
By G. oT. ye, FBS. 
(Pxate VI.) 
THE insects of this small family were first separated from 
Rhogas by Curtis in 1832 and 1833,* when he brought forward 
the genera Macrocentrus and Zele. Forster proposed two addi- 
tional genera, the one, Amicroplus, a division of Macrocentrus, 
and the other, Homolobus, a dismemberment of Zele.+ Ashmead 
has raised the genera of Curtis to the dignity of tribes, which 
is quite necessary if Forster’s genera be accepted, for a glance 
will show that Amicroplus and Homolobus cannot rank equally 
with Macrocentrus and Zele; indeed, Marshall considered that 
Forster’s genera were founded on characters purely specific.§ 
Our few British species may, for convenience, be treated under 
the two original genera :— 
Abdomen elongate, sessile; fore wings with three 
cubital areolets, radial areolet elongate. 
(1) Spurs of hind tibize very considerably shorter than 
half the metatarsi; first abdominal segment 
not or scarcely longer than the second; terebra 
at least as long as the abdomen . ; MACROCENTRUS. 
(2) Spurs of hind tibiz as long as half the metatarsi, 
first abdominal segment much longer than 
the second; terebra short . : , ZELE. 
I must again express my thanks to various entomologists 
who have presented me with specimens, to Dr. D. Sharp and 
Mr. H. F. Bailey for the loan of books, to Mr. Claude Morley, 
who, with his usual kindness, has sent me for inspection several 
insects from his collection, to Col. Nurse for a similar courtesy, 
* Ent. Mag., vol. 1. 
+ Synop. der Fam. und Gatt. der Braconen. 1862. 
t ** Classification of Ichneumon Flies,” Proc. U.S. Nat. Mus., vol. xxiii. 
p. 118. 
§ ‘Species des Hym. d'Europe et d’Algerie,’ vol. 5, p. 228. 
ENTOM.—OCTOBER, 1914. ¥ 
