92 



vious season. In one instance after the first rain (following- a three 

 months' dry spell), which occurred on Tuesday at 11 a. m.. adults were 

 appearing from the pond on the following Sunday at 2 p. m. Adults 

 were captured and caged to secure the eggs, if possible. This we 

 succeeded in doing. In one case we kept a P. howardii female thirty- 

 eight days, during which time she oviposited five times. Several 

 specimens of P. dliata and P. howardii were kept thirty to thirty-two 

 days, with three and four ovipositions. 



During the month of August it was not uncommon to have larvae 

 pupate in four days after hatching, and in one case only nineteen hours 

 elapsed after pupation before the adult emerged. In summer, how- 

 ever, the normal pupal life is from twenty-four to thirty-three hours. 

 During November the larval and pupal life is more prolonged. Eggs 

 deposited in August and September have not hatched up to the present 

 time, and are now likely to remain in this condition until next summer. 



SOME INSECT INHABITANTS OF THE STEMS OF ELYMUS 



CANADENSIS. 



By F. M. Webster, Urbana, III. 



While studying the Isosoma infesting the stems of grains and grasses 

 in connection with some investigations carried out for the Division of 

 Entomology, under Dr. Howard, I have found Ely mux canadensis, to 

 all appearances, unusually attractive to insect life. As will be observed 

 from the accompanying list, several new forms have been found. 

 Another interesting feature of the matter is that, though often Elymus 

 canadensis and K. virginicus have been found growing interjacent, not 

 infrequently touching each other, yet the partiality of insects for the 

 former species is strongly indicated in the list. Species marked with 

 a star (*) were reared also from Elymus virginicus. Unless otherwise 

 stated, the stems from which the species given was reared were from 

 the vicinity of Champaign and Urbana, 111. 

 Isosoma sp. Larvae living in the stems. 

 Isosoma sp. Larvse living in cells in the stems. 

 Eurytoma sp. now? Adults August 15 to 25. 

 *Eupelmus allynii French. ■ 

 *Merisus isosomatis Riley. 

 Ilomoporus chalcidephagus "Walsh. 

 Catolaccus sp.? 



Coccophagus sp.? Princeton, Iud. 

 *P< / rapteromalus isosomatis Ashmead MS. nov. gen. et sp. Parasitic on the cell 



inhabiting Isosoma. Urbana, 111., and Princeton, Ind. 

 Coccidencyrtus flavus Ashmead MS. nov. sp. Princeton, Ind. 

 *OUgosita americana Ashmead MS. nov. sp. Also reared from same species of 



grasses from Princeton, Ind., and in connection with Eurytomocharis eragrostidis 



Howard, at Urbana. This is the first time this genus has been recorded in 



America. 



