1917] The CicadellidcB of Wisconsin 81 



In the collection of leaf hoppers some interesting points 

 have been determined, including the fact that when the 

 temperature is very high in midsummer at midday, these forms 

 seem to retire to the base of the plant, and are collected with 

 difficulty, but earlier or later in the day they may be found 

 in abundance on the same forms of vegetation. It is, therefore, 

 advisable in collecting in midday to take advantage of open 

 woodlands, or such conditions where the vegetation affords 

 a reasonable amount of protection from the sun. Cloudy days 

 are always advantageous for general collecting for these reasons. 

 Some species, however, always feed very close to the ground, 

 and can, therefore, be taken only by intensive sweeping close 

 to the base of the plant. 



It is to be hoped that these interesting forms will be collected 

 more generally in the several states, than they have in the past, 

 and that our economic entomologists will realize more fully 

 the extent of damage which is caused by the millions of tiny 

 sucking individuals occurring frequently in a few acres of 

 pasture. 



This list of species is numbered according to the "Check 

 List of Hemiptera, " prepared by Mr. E. P. Van Duzee, and 

 published by the New York Entomological Society, 1916. 

 The writers desire to express their appreciation of the kindly 

 assistance and suggestions of Professor Herbert Osborn, in 

 the preparation of this list, and also for the privilege of com- 

 paring the specimens with Professor Osborn's valuable col- 

 lection. We wish also to express our appreciation to Mr. 

 Joseph Knull, Harrisburg, Pa., for assisting in the preparation 

 of the drawings. 



Family— CICADELLID^ (Latr.) 1825. 

 Subfamily — bythoscopin^ (Dohrn.) 



1762. Agallia novella (Say) — Generally distributed. 



1764. A. 4-punctata (Prov.)— Common. 



1767. A. sanguinolenta (Prov.) — Common. 



1777. Idiocerus nervatus VD. 



1778. I. pallidas Fh. 



1779. I. suturalis Fh. A fairly common species. 

 1779a. I. suturalis var lunaris Ball. 



1781. I. altematus Fh. 



1782. I. verticis (Say). 

 1795. I. lachrymalis Fh. 



