No. 22.] HYMENOPTERA OF CONNECTICUT. 523 



2. Mesonotum rugulose, shagreened or coriaceous, but not 



umbilicately punctate; thorax opaque or subopaque; abdo- 

 men longer than thorax 3 



Mesonotum more or less umbilicately punctate; pronotum 

 with a rather distinct spot hageni 



3. Pronotum with a minute spot hordei 



Pronotum with a large spot; second abdominal segment 



shorter than fourth and fifth together tritici 



4. Winged grande form grande 



Wingless grande form minutum 



The males must be determined by associating them with their 

 mates. 



°I. (Philachyra) grande Riley. U. S. Dept. Agric, Div. En- 

 tomology, Bull. 2, Technical Sen, 1896, Fig. i.; U. S. Dept. 

 Agric, Ann. Rept., 1881-2, PI. xii. Fig. 3. 



In this species there is an alternation of generations which 

 gives it a unique position in the genus Isosoma. The winged 

 summer generation is the form grande, and consists only of 

 females; the wingless spring and winter generation, the form 

 minutum Howard, consists of both sexes. 



°I. hageni Howard. 



°I. tritici Fitch. U. S. Dept. Agric, Div. Entomology, Bull. 

 2, Technical Ser., 1896, Fig. 7. 



I. hordei Harris. 



Reared from barley. 



I. sp. 



Reared from timothy grass at the Experiment Station in New 

 Haven. 



Evoxysoma Ashmead. 

 °E. vitis Saunders. U. S. Dept. Agric, Div. Entomology, 

 Bull. 2, Technical Ser., 1896, Fig. 9. 



Female : length 3 mm. ; head, pronotum, and mesonotum um- 

 bilicately punctate; metanotum with a median longitudinal de- 

 pression with convex sides, shagreened in the center ; mesopleurae 

 below tegulae shagreened, as are all the coxae ; antennae submonili- 

 form ; abdomen as long as head and thorax combined ; body most- 

 ly black ; scape yellowish ; all coxae black except front pair, which 

 are somewhat yellowish at tip, rest of front and mid legs honey- 

 yellow, hind femora brown medially, honey-yellow at both ends. 



