British parasitic Hymenoptera. 421 



Spec. 1. Ceph. /ormiciformis Westw. Nigra, nitida; pedibus anten- 

 nisque piceis; his in $ articulis secundo et tertio pallidis ; variat °. 

 corpore piceo, pedibus, praesertim tibiis et tarsis, pallidioribus. 



Long. corp. \ — § lin.; expans. alar. 1 lin. In mus. nostr. Habitat in 

 fungis [pileatis] prope Londinum. s "^^v, 



Black shining ; legs and antennae pitchy, the 2d and 3d joints of the 

 latter, in the female, pale ; the female varies in having the body pitchy and 

 the legs paler. In [mushroom-like] fungi near London, (rf, The insect much 

 magnified; e shows the natural length of the insect.) 



Epime v ces * Westw. , a Platygastro disjunctus. Abdomen in utroque 

 sexu thorace triplo longius, segmentis tribus posticis valde elongatis et 

 attenuatis; alae aveniae; antennae in utroque sexu 10 articulatae, articulo 

 tertio secundo minori; in g subfiliformes articulis 4 — 10 aequalibus; in 

 °. articulis 4 ultimis clavam magnam formantibus ; scutellum J 1 inerme, 

 $ mucronatum. 



Abdomen in both sexes three times as long as the thorax, with the 

 last three segments very long and slender ; wings nerveless ; antennae in 

 both sexes 10-jointed, with the 3d joint smaller than the second; in the 

 male they are subfiliform, with the 4th to the 10th joints equal-sized; in 

 the female the last four joints form a large club ; scutel in the male 

 unarmed, in the female mucronate.f 



Spec. 1. Epim. ensifer Westw. Niger, subnitidus ; femoribus piceis 

 apice pallidis ; tibiis fuscis, basi et apice tarsisque pallidis ; abdomine ni- 

 tido, basi longitudinaliter striato (g). 



Long. corp. If lin.; expans. alar, l£lin. In mus. nostr. Habitat in 

 Sylva Coombe, fine Maii. |0 mvfn-<j 



Black, somewhat shining ; the thighs pitchy, with the tips pale; tibiae 

 brown with the base and tips, and also the tarsi, pale ; abdomen shining, 

 longitudinally striated at the base. V/. : .usi -„ I 



At Coombe. 



Spec. 2. Epim. ventralis Westw. Niger, subnitidus ; abdomine seg- 

 mentis tribus basalibus subtus rotundato-compressis (abdomen Cynipis 

 referentibus), segmentis tribus apicalibus valde arcuatis; e parte supera 

 articuli praecedentis exeuntibus (h); pedibus nigris ; tibiis basi tarsisque 

 rufescentibus. 



Long. corp. f lin. ; expans. alar. 1 J lin. In mus. nostr. Habitat prope 

 Can tabrigiam, Julio, 1833. tefcnrrt&t 



Black, somewhat shining; abdomen with the three basal segments (Com- 

 pressed and rounded beneath (resembling the abdomen of a Cynips), the 

 last three segments much curved and arising from the upper part of the 

 preceding segment ; legs black ; tibiae at the base and the tarsi reddish. - 



I possess other species of this subgenus. , > ,Jhnsg 



Messrs. Haliday and Curtis do not appear to be acquainted with the 

 type of the genus Platygaster (PI. ruficornis Latr.), since it is erroneously 

 located in their tables (vid. Gen. Crust., vol. iv. p. 31. last line): the de- 

 scription there given, I can affirm from an examination of Latreille's speci- 

 mens, is perfectly correct, truli 



The Grove, Hammersmith, J. O. Westwood. 



July 29. 1833. 



i 



* Epimekesy long; from the elongation of the abdomen. 



f The sexual differences of Platygaster, and its subdivisions, have not 

 been previously correctly ascertained, sexual characters having been re- 

 garded as sectional. ' ,h? \ 



E E 3 



