OF WASHINGTON. 129 



optera; the monograph of the Proctotrypidse, and the classifica- 

 tion of the superfamilies of Hymenoptera. His economic work 

 is best exemplified in his " Orange Insects," in which he was a 

 pioneer. In the Hemiptera he took great interest, much more 

 than that indicated by the few papers thereon. He not only 

 collected Hemiptera extensively, but exchanged with Europe- 

 ans, amassed a considerable library, and had a manuscript 

 catalogue to most of the groups. Even to within a few years 

 of his death he had expected to again devote time to the 

 Hemiptera. His interest in Coleoptera was chiefly with the 

 Coccinellidae, in which family he had described a new species 

 during his economic work. 



His work on Hymenoptera began with the study of galls. 

 He collected them in Florida, a then unworked region, and 

 described many new species. In rearing the Cynipidse he also 

 obtained many chalcidids. He thus became interested in all 

 the micro-Hymenoptera, and these thereafter held first place 

 in his studies. He described hundreds of new species in this 

 new field, and after coming to Washington described in other 

 families, always showing a partiality for the parasitic forms. 

 Then followed his most valuable and finished work, the Mono- 

 graph of the Proctotrypidse. To this he devoted several years 

 of close study, not only, as before, going into specific descrip- 

 tion, but into the generic characters, and into the general 

 structure and morphology of the family. The completion of 

 this great monograph gave him confidence in his powers of 

 classification ; a confidence that, overlooking all obstacles, 

 pictured the finished work. Here in the Monograph of the 

 Proctotrypidse, for the first time, he had numerous illustrations 

 of the insects, and thereafter in nearly all of his descriptive 

 papers he endeavored to figure some of the forms. 



His success in presenting the generic classification of the 

 Proctotrypidse doubtless led him to attempt the same for the 

 other families. This last, and in many ways the most import- 

 ant work of his career, was scarcely finished at his death. The 

 magnitude of this task never daunted him, the difficulties in 

 obtaining literature and specimens never wearied him, but 

 with the enthusiasm gained from the discovery of new struc- 



