71 



the heads of the females are given to point out the characters 

 that are of value in separating them. 



Tabanus costalis has the stripes on the sides of the abdomen 

 continuous, the front border of the wing is brown and in living 

 specimens the eye is green crossed by a single purple band. 

 Tabanus lineola has the markings on the sides of the abdomen 

 in the form of a series of elongate spots which do not form con- 

 tinuous stripes ; the wings are hyaline all over and the eyes each 

 have other purple markings besides the single band. Tabanus 

 5-vittatus is the largest of the three. It has the abdomen almost 

 as in costalis and the wings as in lineola. The color of the eyes 

 in living specimens is of the same pattern as in lineola but the 

 purple markings are not so extended. These horseflies are ex- 

 tensively preyed upon by several of the predaceous insects pre- 

 viously given. A figure of Bembex belfragei is given in the 

 plate. 



Something has been done in some of the States toward an 

 investigation of the insects that are injurious to native grasses. 

 Professor Osborn, working in Iowa, and Professor Bruner in 

 Nebraska, each have published on the subject. At first thought 

 this may appear as a minor matter, but when we think that 

 there are many species of native grasses and" that nearly every 

 one of them has its particular insect, and some two or more, be- 

 sides the large number of general feeders, it is easy to see that 

 the pastures and meadows would be much more productive if 

 ]t were not for the myriads of grass feeding species. The insects 

 that are worthy of mention from the standpoint of injury to 

 grasses at Cameron are the leafhoppers and the grasshoppers, 

 although several moths and other insects known to feed on these 

 plants were taken and their names are included in the accom- 

 panying list. Tettigonia harti, Draeculacephala moliipes and 

 others were exceedingly abundant over an extensive territory, 

 i'nd are, perhaps, among the more destructive leafhoppers of 

 the region. Several of the common species of grasshoppers in 

 the locality are abundant in individuals and these M'herever 

 found are enormous feeders. 



I'late I M'as made under the direction of Professor Osborn 

 and shows three species of leafhoppers of special interest on 



