abundance elsewhere, and found but a single specimen, and this of the 

 short-winged form, which occurs also in New York, being variety (e) of 

 Fitch. I have spent a great deal of time and investigation in trying to 

 unravel the mystery of this distribution, but can now give no reason for 

 the almost total absence of the species in the northeastern portion of the 

 state, while they are overabundant in the opposite direction. 



While located in Indiana, an opportunity was offered me to study the 

 distribution of three broods of Cicada septendecim, Linn., very carefully. 

 These were Brood XXII., 1885; Brood V., 1888; Brood VIII., 1889. The 

 first of these covered the whole area of the state except a narrow strip of 

 country around the southern extremity of Lake Michigan, the outlines 

 being approximately described by a line commencing at the northern 

 boundary of the state, nearly or quite due north of the city of LaPorte, 

 and extending nearly south- southwest, running a short distance east of 

 Westville, on the L., N. A. & C. R. R., and crossing this railway near 

 Wanatah ; then sweeping southwest to the western boundary of the state. 

 This brood probably occupied the territory along the Kankakee river, and 

 extending a short distance northward into Lake and Porter counties. 



Brood V., 1888, so far as I have been able to learn, covered almost ex- 

 actly the area not visited by Brood XXII., and was not observed else- 

 where in the state. 



Brood VIII., I have definitely recorded from the counties of Brown, 

 Clark, Crawford, Daviess, Dearborn, Floyd, Gibson, Harrison, Johnson, 

 Knox, Lawrence, Monroe, Morgan, Orange, Scott, Tippecanoe, Warwick 

 and Washington. In Harrison county, only, were the insects abundant, 

 and in Tippecanoe county the invasion was only known from a single 

 female captured by the young sons of Dr. E. Test. Broods XXII. and V. 

 are both strong ones, while Brood VIII. is apparently very weak, and, 

 owing to the clearing up of the forests and the attacks of the English spar- 

 row, it will not be surprising if it becomes nearly or quite extinct in 

 Indiana during the next century. 



Of the Diptera very little is really known. I am quite sure the two 

 species of Simulium, S. pecuarium, Riley, and S. meredi&nale, Riley, both 

 inhabit the southwestern portion of the state. How far northward they 

 may occur I am not able to say. The species found in Franklin county 

 I am sure is different, but it may not be a northern form. 



I have thus gone over the subject in a general way, without going int«» 

 a detailed account of a greater number of species than necessary to illus- 



