CONTRIBUTIONS TO OUR KNOWLEDGE OF THE BRITISH BRACONID^. 135 



Marshall gives the following characters for the tribe (' Trans. 

 Entom. Soc.; 1885, p. 78) : 



Head transverse, occiput margined ; mandibles bifid ; maxillary 

 palpi 6, labial 4-jointed ; abdomen sessile, segments 1-3 largest, 

 sculptured, thyridia of 2nd and 3rd visible ; three cubital areolets. 

 the second rectangular (in Clinocentrus and Felecy stoma, trapezoidal); 

 recurrent nervure rejected ; submedian areolet longer than the 

 median ; subdiscoidal nervure not interstitial ; terebra subexserted 

 (in Clinocentrus and Pelecy stoma exserted). 



Genus 1. — Pelecystoma, Wesm.* 



Distinguished by the internally dilated third joint of the 

 maxillary palpi. A single species has been recorded as British, 

 namely, P. lutea, Nees.,t with which I am quite unacquainted ; 

 it has been reared from larvas of Heterogenea limacodes, Hufn. 



Genus 2. — Heterogamus, Wesm.^ 



Very close to PJiogas and scarcely worthy of distinction. The 

 single species is divided from Rhogas principally on account 

 of the white-banded female antennae and the shorter second 

 cubital cell (abdominal segments 5-7 are retracted, but this is 

 a character now shared by Rhogas arcticus, Thoms.). 



Dispar, Curtis. § 



Has never occurred to me in the New Forest, though Morley 

 took a specimen at Lyndhurst in 1901. In the Cambridge 

 University Museum is a female labelled, " F. J. Crowboro, 

 9/8/1912." This insect has 42-jointed antennae; the basal 

 14 joints of the flagellum are testaceous, then come 6 pure 

 white, while the apical 22 are blackish. 



Genus 3. — Rhogas, Nees.|i 



A genus of interesting and rather handsome insects, some 

 being of considerable size. Distinguished by the distinct 

 suturiform articulation, rugulose or aciculated basal segments 

 of the abdomen, and concealed or, at most, subexserted terebra ; 

 also the median cell is shorter than the submedian, first discoidal 

 cell longer than the second, and first abscissa of radius shorter 

 than second. They are parasites of lepidopterous larvae, and, 

 so far as my experience goes, always solitary ; it is worthy of 

 note that the few old records of gregarious parasitism have 

 never been confirmed. 



* 'Nouv. Mdm. Ac. Brux.,' 1838, p. 91. 

 t ' Mon.,' i, p. -218. 



I 'Nouv. Mem. Ac. Brux.,' 1838, p. 120. 

 § 'B.E.,' dxii. 



II 'Acta Acad. Leop.-Car.,' 1818, p. 306. 



