ASllMKAU: (LAS.slKl CATION UK THE ClIALCIl) FLIKS 205 



4. AiitcuiKL' with three ring-joints 5 



Autcnnte with two ring-joints. 



Head and thorax umbilicately punctata, the iiaraiisidal furrows wanting ; jiroiioluni as wide as 

 the mesonotuin, the liind margin areuately eniarginatu ; llagcHinn filiform, juihcscent, the 

 joints subquadrate Neorileya Ashmiad. 



5. Head and thorax smooth or nearly, at most very finely punftalu or microscoiiii-ally shagivened, (he 



parapsidal furrows sometimes delicate but distinct. 



Pronotum as wide as the mesonotum, more than twiuu wider tlian hing ; abdonuii ovate, llie 

 fourth segment very long; flagellum filiform, piiheseeut, the joints of the fiiniele nearly 



equal, a little wider than long Rileya Ashmead. 



Pronotum quadrate, nearly as long as wide and a little narrower than the mesonotum ; abdomen 

 elongate, cylindrical, as long as the head and thorax united, the segments sube(iual ; flagellum 

 subclavate, gradually thickened towards the tip, the last two joints of funicle transverse. 



Macrorileya Ashmead. 



Tribe V. Dccatoinhii. 



This tribo is veiy closely allied to the ti'ibe EunjUnnhii, but is readily separated 

 from it and the other tribes by the much thickened or stigmated marginal vein, 

 and by the anteniue being alike, or very similar, in both sexes. The hind tibite are 

 always armed with rigid bristles behind. Some of the Eiirytomhii, however, also 

 have similarly armed tibiae, so that this character in itself is not sufficient to dis- 

 tinguish the group. 



All the species are parasitic upon hymenopterous and dipterous gall-makers. 

 ( Ci/nqmhe and Cedduymjiidiv). 



Only two genera fall into this tribe, distingui-shed as follows': 



TABLE OF GENERA. 



1. Females 2 



Males 3 



2. Wings hyaline, with a dusky submarginal blotch or band ; antennte i)-;ointed, with one ring-joint, the 



club usually not jointed, if with :J indistinct joints, 11-jointed, pedicel obconical, nearly thrice as long 



as thick at apex Decatoma Spinola (type Diplolepis adonidum Rossi). 



Wings hyaline, without a dusky submarginal blotch ; jjcdicel shorter, not or hardly twice as long a.s 

 thick at apex Eudecatoma Ashmead (type E. batatoldes Ashmead). 



3. Wings hyaline, with a dusky or fuscous submarginal blotch or band Decatoma Spinola. 



Wings hyaline, without a dusky submarginal blotch ; all femora considerably swollen. 



Eudecatoma Ashmead. 

 Family LXIV. PERILAMPID.K. 

 1846. Eucharidte, Family (partim), Walker, List Chalc. Brit. Museum, I., p. 103. 

 1856. Perilampoidaj, Family IX., Forster, Hym. Stud., II., pp. 19, 22 and 46. 

 1875. Perilami^ina, Tribus, Thomson, Hym. Skand., IV., pp. 11, 22. 

 1886. Perilampinte, Subfamily, Howard, Ent. Amer., I., p. 198. 



