264 MEMOIRS OF THE CAKNEOIE MUSEUM 



I conside'i' the species composing this tfihe to be genuine Eurytuun<ls, but with 

 a habitus quite their own and difficult to describe intelhgently — the head, prono- 

 tum and abdomen being shghtly different from those in the EuryUjiainl. The 

 sculpture, too, except in the genus Neor'ileija, is different from other Eurytomids. 

 The shape of the abdomen in some of the species recalls to mind the sul)family 

 Onnyrime, in the Torymidie, the species of which have similar antenme and show 

 same affinity with this tribe. 



Macrorileya is parasitic in the eggs of tree-crickets {(Ecanthus sp.) ; a species of 

 Neorileya was bred by Mr. Urich, in Tiinidad, W. I., from an egg of an unknown 

 orthopterous insect ; while tlie species belonging to the genus Rileya are parasitic 

 upon the larvae of various Cecidomyiids. 



TABLE OF GENfiRA. 



1. Females 2 



Males ■ 4 



2. Head aud thorax smooth or nearly or at the most, very finely punctate, or feebly microscopically 



shagreened 3 



Head and thorax iimbilicately punctate. 



Pronotum as wide as the mesonotum, the hind margin arcuately emarginate, straight and trun- 

 cate in front ; mesonotum without fiinows ; axillse rather small, triangular, widely separated ; 

 antennae 13-jointed, with two ring-joints, the flagellum short, not twice the length of the scape, 

 subfiliform, the funicle 6-jointed, the joints subquadrate, hardly as long as wide ; marginal 

 vein scarcely longer than the stigmal, shorter than the postmarginal ; abdomen oval, de- 

 pressed, shorter or not longer than the thorax, subconvex above, and briefly petiolate, the 

 fourth segment much the longest, the third very short, the second and fifth about equal, 

 united not longer than the fourth Neorileya Ashmead, g. nov. (type N. flavipes Ashm.). 



3. Antennie with three ring-joints. 



Pronotum as wide as the mesonotum, the hind margin straight, a little more than twice wider 

 than long and about as long as the mesonotum ; parapsidal furrows delicate but complete, or 

 nearly, sometimes obliterated anteriorly ; head (ransverse, a little wider than the thorax ; fla- 

 gellum subclavate, the funicle 5-jointed, joints 3-5 transverse ; marginal vein fully twice as 

 long as the stigmal and a little longer than the postmarginal ; abdomen suhcylindrical, conic- 

 ovate, a little longer than the head and thorax united, almost sessile, the fourth segnient very 



large, occupying most of the surface, the others very short Bileya Ashmead 



(type R. cccidomyise Ashm.). 



Pronotum quadrate, a little nairowor than the inesouotuui and hardly shorter thau wide; par- 

 apsidal furrows distinct, complete ; head transverse, as wide as the thorax across from tegula 

 to tegula, subconeave behind, convex in front, with a fi-ontal excavation for the antennal 

 scape ; flagellum subclavate, the funicle 6-jointed, joints 2-6 subquadrate, the last two a little 

 wider than long ; marginal vein very long, more than twice longer than the stigmal vein, the 

 postmarginal vein very long and slender ; abdomen very long and narrow, lanceolate, sub- 

 compressed, nearly twice as long as the head and thorax united, joints .5, G and 7 long, tlie 

 sixth the longest of the three, the eighth projecting and pointed. 



Macrorileya Ashmead g. nov. (type Bilei/a cvcantlii Ashm.). 



