February 1891 .] 



PSYCHE. 



21 



science which deals with the diseases of 

 cultivated plants. Fourth, those which 

 destroy other property ; in this category 

 are die insects attacking furs, woollen 

 goods, etc., and the food stuffs, which 

 belong to domestic economy and at the 

 same time to commerce ; library insects 

 belong to library economy and so on. 

 Fifth, those directly beneficial to man, 

 which includes the bee. the silk worm, 

 etc., industries which form one of the 

 primary divisions of agriculture. Sixth, 

 those indirectly beneficial to man by de- 

 stroying the injurious insects; these in- 



sects of course belong to the sciences 

 that consider the insects which are their 

 victims. 



Finally, to recapitulate, scientific en- 

 tomology is a department of biology, 

 economic entomology of agriculture. 

 They have all the difference between 

 them that there is between a pure sci- 

 ence and an economic science. Can we 

 as a society include them both ? I think 

 we should not. On the other hand the 

 economic entomologists are nearly all 

 at the same time scientific entomolo- 

 gists. These we can and do welcome. 



A LIST OF THE ORTHOPTERA OF ILLINOIS.— II. 



BY JEROME MCNEILL. FAYETTE VILLE, ARK. 



LOCUSTIDAE. 



19. Scudderia curvicauda De Geer. 

 This is an abundant species in Illinois 

 in suitable localities. Its favorite haunt 

 is the wild meadows and prairies cov- 

 ered with coarse grasses and weeds. It 

 is the only one of the katydids that 

 flies freely in the daytime. It is in fact 

 crepuscular rather than nocturnal. It 

 may be seen flying at any hour of the 

 day, but its note is not generally heard 

 until the middle of the afternoon. The 

 note cannot be supposed to represent 

 more than the first two syllables of the 

 "Ka-ty-did" or "Ka-ty-did-n't" of its 

 congeners. It is made but once and 

 the rasping jerky sound has been very 

 well represented by Mr. Scudder as 



bzrvii. It has been found at Moline as 

 early as the 21st of July. 



20. Scudderia fuscata B runner. 

 This species is more abundant than the 

 last but it too must be looked for in the 

 right place. It is even less domestic in 

 its habits than curvicauda. The latter 

 is sometimes found about houses and 

 gardens in town but the former is almost 

 never seen in town. It may be looked 

 for in the shrubs and undershrubs of 

 open woods and clearings and in weedy 

 fields and meadows. Its note is indis- 

 tinguishable from that of curvicauda 

 but it is much less frequently heard. 

 The earliest recorded date of its cap- 

 ture at Moline is August 4th. 



21. Amblycoryplia obloiigifoliaY>Q. 



