328 MEMOIRS OF THE CARNEGIE MUSEUM 



2. Head very wide, the occiput strongly concave 3 



Head not esi)ecially wide, tlie occiput not strongly concave 6 



3. Winged 4 



Wingless or subapterous. 



Antennse strongly clavate, 9-jointed, ending in a large, solid ovate club, the scape dilated at 

 apex ; funicle 6-jointed, joints 2-6 transverse, the sixth about four times as wide as long ; me- 

 tathorax very short, without carinie, the spiracles small, rounded ; abdomen oval, the petiole 

 scarcely longer than thick, the third segment (second body segment) a little longer than the 

 second Pheidoloxenus Ashmead, g. nov. (type P. wheelcri Ashm.). 



4. Autennie 10-jointed 5 



Antennse 13-jointed 9 



5. Abdomen with the second segment abnormally large, occupying most of the surface. 



Marginal vein scarcely longer than the stigmal vein, the postmarginal vein wanting ; body of 

 al)domen with a tuft of hairs ou each side at base. 



Tomocera Howard (type T. culifurnica How.). 

 Marginal vein fully twice as long as the stigmal vein, the postmarginal vein distinct, about the 

 length of the stigmal ; uo tuft of hairs at base of abdomen. 



Ophelosia Riley (type 0. crawfordi Riley). 



a. Blaiginal vein aljout three times as long as the stigmal vein or a little longer.. 7 



Marginal vein short, at the most scarcely twice as long as the stigmal vein, usually shorter 8 



7. AntenuiB 10-jointed, the second joint of the funicle twice as long as the first ; scutellum ivilh a cross- 



furrow before the apex Aphobetus Howard (type A. maskelli How.). 



Antennte 13-jointed 9 



8. Marginal vein hardly twice as long as the stigmal vein, the postmarginal vein very short ; antenn:e 



10-jointed, the joints of the fLUiicle short, subnioiuliform ; scutellum ivilhout a cross-furrow before 



the apex Aphobetoideus Ashmead, g. nov. (type A. comperei Ashm.). 



Marginal vein hardly as long as the stigmal vein, the postmarginal vein long ; antennaj 13-jointed, with 



2 ring-joints Asaphes Walker (type A. vulgaris Walk.). 



y. Marginal vein aliout thrice as long as the stigrnal vein. 



Parasaphes .Vshmead, g. nov. (type P. iceri/ic Ashm.). 



10. Antenna' 9 or 10-joiuted ; head usually wide 11 



Antenna; 13-jointed ; head normal 1-1 



11. Postmarginal vein wanting or very .short 12 



Postmarginal vein distinct, about the length of the stigmal vein. 



Marginal vein twice as long as the stigmal ; no tuft of hairs at base of scutellum. 



Ophelosia Riley. 



12. Marginal vein long, about twice as long as the stigmal or even thrice as long 13 



jNIarginal vein .short, hardly as long as the .stigmal. 



Abdomen with a tuft of hairs on each side at base ; antennie dentate Tomocera Howard. 



13. Antenna; 9-joiuted. 



Scutellum without a cross-furrow before apex Aphobetus Howard. 



Scutellum with a cros.s-furrow before apex Aphobetoideus Ashmead. 



14. Marginal vein scarcely as long as the .stigmal vein, a little thickened at base, the postmarginal vein 



long Asaphes \\'alker. 



Marginal vein about thrice as long as the stigmal vein Parasaphes Ashmead. 



