ART. 15«. EEVISION OF SUBFAMILY PLATYGASTERINAE — FOUTS. 



TABLE TO GENERA. 



1. Scutellum densely and evenly covered with appressed pubescence; last two 



antennal joints in female closely joined I. Amblyaspis Foerster. 



Scutellum not densely and evenly covered with appressed pubescence; terminal 

 antennal joints not closely jointed 2. 



2. Scutellum flattened 3. 



Scutellum not especially flat, either convex or subconvex 6. 



3. Antenna in both sexes nine-jointed II. Fidiobia Ashmead. 



Antenna in both sexes ten-jointed 4. 



4. Terminal three or four joints in the female antenna forming a club 5. 



Antennae filiform or clavate but the club not formed by a special differentiation 



in the size of the terminal three or four antennal joints. 



VIII. Platygaster Latreille. 



5. Antennal club in female three- jointed III. Amitus Haldeman. 



Antennal club in female four-jointed XI. Leptacis Foerster. 



6. Antennal club in female three-jointed 7. 



Antenna without a three- jointed club 8. 



7. Propodeum not visible in a dorsal view of the insect. . . III. Amitus Haldeman. 

 Propodeum sloping, visible in a dorsal view IV. Isorhombus Foerster. 



8. Second tergite with two basal foveae; antenna in female without a club formed 



by special enlargement of the last four joints 9. 



Second tergite without foveae and never with striae basally; antenna of female 

 with a four-jointed club 12. 



9. Scutellum with a tuft of hair above; if the tuft is not distinct then the scutellum 



is very high, conical when seen from the side 10. 



Scutellum without a trace of such a tuft, not high and conical 11. 



10. Head cubical seen from above, very full above and behind the eyes. 



V. Isocybus Foerster. 



Head usually distinctly transverse, if somewhat cubical then not so full above 



and behind the eyes VI. Trichacls Foerster. 



11. Head with a sharp tooth-like projection between the antennae. 



VII. Eritrissomerus Ashmead. 

 Head without such a projection VIII. Platygaster Latreille. 



12. Thorax strongly compressed; head flattened antero-posteriorly; abdomen flat- 



tened IX. Piestopleura Foerster. 



Thorax not noticeably compressed; head and abdomen not especially flat. 13. 



13. Second sternite in female depending sack-like below the second tergite, the 



following segments forming a tail X. Sactogaster Foerster. 



Abdomen normal XI. Leptacis Foerster. 



I. Genus AMBLYASPIS Foerster. 



Amblyaspis Foerstek, Hym. Stud., Heft 2, 1856, pp. 107, 112. Genotype.— A. 



aliena Foerster (By original designation). Three species. 

 Amblyaspis Foerster, Ashmead (part), Bull. 45, U. S. Nat. Mus., 1893, p. 266. 



Head transverse, more or less circular seen from in front; occiput 

 margined or immargined; ocellocular line usually greater than the 

 lateral ocellar; antennae in both sexes ten-jointed, with a more or 

 less distinct four-jointed club in the female; joints three and four 

 rather large and thick, subequal, thicker than the pedicel or joints 

 five and six; last two joints of the club closely joined; antenna of 

 male more or less similar to that found in Platygaster, the joints 



