No. 22.] HYMENOPTERA OF CONNECTICUT. 517 



2.5-3 mm. long and brown-black. Male : length nearly 2 mm. ; 

 differs from the other sex in the almost entirely green head and 

 in the presence of more of the metathoracic blue on the thorax. 

 Reared from the Psyllid Pachypsylla venusta Osten Sacken. 



EURYTOMIDAE. 

 Key to Genera. 



1. Metathorax above not longer than scutel ". . 2 



Metathorax above always longer than scutel 9 



2. Marginal vein stigmated; hind tibiae posteriorly provided 



with rigid bristles; antennae at most n-jointed, with one 

 ring-joint, funicle 4-jointed and very similar in both sexes, 



without whorls of hair 3 



Marginal vein not stigmated 4 



3. Front wings without a dusky submarginal blotch or band.. 



Eudecatoma p. 519 

 Front wings with a dusky submarginal blotch or band .... 



Decatoma p. 518 



4. Antennae 13-jointed, with two or three ring-joints, and very 



similar in both sexes, funicle joints not excised or petiolate 



at apex and without whorls of hair 5 



Antennae 10- to 12-jointed, with only one ring-joint, and 

 dissimilar in the sexes, male funicle joints excised or 

 petiolate at apex, and with whorls of hair or with sparse 

 hair; body not metallic; mesonotum umbiKcately punc- 

 tate; first joint of flagel shorter than scape; mesonotum 

 with distinct, complete furrows; head sometimes with a 

 deep antennal furrow, but anterior ocellus never placed 

 therein 6 



5. Pronotum quadrate, a little narrower than mesonotum 



Macrorileya p. 519 

 Pronotum as wide as mesonotum, a little more than twice 

 as wide as long Rileya p. 520 



6. Marginal vein always distinctly longer than stigmal vein, 



and tibiae with two apical spurs 7 



Marginal vein not as long as or scarcely longer than stig- 

 mal vein 8 



7. Females: postmarginal vein not much longer than stigmal; 



antennae filiform or nearly so, at most subclavate, not 

 much thickened toward apex; joints of funicle cylindrical; 

 abdomen conic-ovate, subcompressed, fifth segment seen 



from the side shorter than wide Eurytoma p. 520 



Males: postmarginal vein only a little longer than stigmal; 

 funicle 5-jointed, joints at apex above excised, pedi- 

 cellate, and with long whorls of hair; body of abdomen 

 subovate, petiole usually longer than hind coxae, fourth 

 segment longest Eurytoma p. 520 



