264 MEMOIRS OF THE CARNEGIE MUSEUM 



I consider the species composing this tiibe to be genuine Eurytomids, but with 

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

 tum and abdomen being slightly different from those in the Eurytomini. The 

 sculpture, too, except in the genus Neorileya, is different from other Eurytomids. 

 The shape of the abdomen in some of the species recalls to mind the subfamily 

 Ormyrinx, in the Torymidse, the species of which have similar antennse and show 

 same affinity with this tribe. 



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

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

 orthopterous insect ; while the species belonging to the genus Riley a are parasitic 

 upon the larvse of various Cecidomyiids. 



TABLE OF GENERA. 



1. Females 2 



Males 4 



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



shagreened 3 



Head and thorax umbilicately punctate. 



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

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

 antenuse 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. Antennae 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 transverse, 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 subcylindrical, conic- 

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



large, occupying most of the surface, the others very short. Rileya Ashmead 



(type B. cecidomyise Ashm.). 



Pronotum quadrate, a little narrower than the mesonotum and hardly shorter than wide ; par- 

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

 to tegula, subconcave behind, convex in front, with a frontal 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- 

 compi-essed, nearly twice as long as the head and thorax united, joints 5, 6 and 7 long, the 

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



Macrorileya Ashmead g. nov. (type Rileya cecanthi Ashm.). 



