223
THE HYMENOPTERA OF SUFFOLK.
[Colonel Hawley kindly presented us with a dozen cocoons, each pierced near one extremity by the circular hole whence had emerged singly both sexes of the above parasitic Braconid, which proves upon examination to be a species of Rhogas as anticipated (Trans, iii, 196 where read Jubbulpore throughout for Tubbulpore) and has been described (Entom. 1937, p. 255) by us as Rhogas siccitesta, sp. nov., because it emerges from the indurated husk of its host's larva. It is a solitary parasite of D. nerii, L., showing no indication of its presence tili the laiter's Caterpillar is or two inches in length : " I saw no parasite laying eggs in these larvae," the Colonel says in lit. Sept. 1936, but they were already attacked when I found them about one or \ \ inches long and looking quite healthy. Soon after that they collapsed suddenly and became brown over the three or four central segments, but remained fixed to their fulcrum. In a few hours the anterior five or six segments became detached and feil to the ground, leaving the posterior ones still in situ to form the ' cocoon ' for the parasite's pupa, whose larva is a greenish-white creature fully a quarter-inch in length." T h e whole process is obviously analogous to that of British species of this genus, especially Rhogas prertor, Reinh., which thus slays the allied Smerinthus populi, Linn.—Ed.]
THE
HYMENOPTERA PORTIO TERTIO ET
Subfamily
OF
SUFFOLK.
ULTIMO.
OPHIONINJE.
Plectücus collaris, Gr.—Finbro (Tuck), Lackford, Walberswick. P• terebrator, Fst.—On Monks Soham House window, 30 August. P. melar.ocerus, Fst.—Beaten from poplar in Bentlev Woods on 23 May 1931. Aperileptus albipalpus, Gr.—Rarelv seen [reccrded from Norfolk]. Proclitis prcetor, Hai.—Swept at Claydon bridge, September. P. socius, Hai.—Brobablv not uncommon : on nettles at Wherstead. Megastylus cruentator, Schd.—Tostock (Tuck); common at Monks Soham, &c. M. conformis,Fst.—Taken at Palmers Heath, Brandon, May. Helictes erythrostomus, G m — S w e p t at Mildenhall on 19 June 1915. H. mediator, Schd.—Not uncommon : on nettles at Wherstead. H. borealis, Hlg.—Abundant everywhere throughout the County. Ponzon exhaustator, Fab.—Quite rare : in a Wherstead lane, 28 October 1898.