328 MEMOIRS OF THE CARNEGIE MUSEUM 



2. Head very wide, the occiput strongly concave 3 



Head not especially wide, the occiput not strongly concave 6 



3. Winged 4 



Wingless or subapterous. 



Antennae 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 carinje, 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. wheeleri Ashm.). 



4. Antennae 10-jointed 5 



Antennae 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 

 abdomen with a tuft of hairs on each side at base. 



Tomocera Howard (type T. calif ornica How.). 

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

 length of the stigmal ; no tuft of hairs at base of abdomen. 



Ophelosia Eiley (type 0. crawfordi Riley). 



6. Marginal vein about 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. Antennae 10-jointed, the second joint of the funicle twice as long as the first ; scutellum with a cross- 



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



Antennae 13-jointed 9 



8. Marginal vein hardly twice as long as the stigmal vein, the postmarginal vein very short ; antennae 



10-jointed, the joints of the funicle short, submoniliform ; scutellum without 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 ; antennae 13-jointed, with 

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



9. Marginal vein about thrice as long as the stigmal vein. 



Parasaphes Ashmead, g. nov. (type P. iceryse Ashm.). 



10. Antennae 9 or 10-joiuted ; head usually wide 11 



Antennae 13-jointed ; head normal 14 



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 



Marginal vein short, hardly as long as the stigmal. 



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



13. Antennae 9-jointed. 



Scutellum without a cross-furrow before apex Aphobetus Howard. 



Scutellum with a cross- 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 Walker. 



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



