562 PROCEEDINGS OF THE NATIONAL MUSEUM vol. ii4 



The basal cluster may contain as few as 4 cornuti to as many as 13, the 

 apical cluster may contain from 2 to 8, and the total for both clusters 

 ranges from 8 to 18. The basal cluster usually contains the most 

 cornuti, but occasionally its nmnber is equaled or even exceeded by the 

 number in the apical cluster. Individually, the cornuti vary in size 

 from minute to very large. This variation is essentially nongeographic. 



Type. — Two type specimens in the Academy of Natural Sciences of 

 Philadelphia. 



Type locality. — "Texas." 



Distribution. — This species has a very wide range. It has been 

 reported from northern South America, Central America, and Mexico, 

 as well as from the United States where it is quite common except in 

 the northwestern states and the extreme north and west. It has been 

 recorded from Arizona, New Mexico, and Texas northward through 

 Oklahoma, Kansas, and Nebraska and eastward to Pennsylvania, 

 New Jersey, North Carolina, and Florida. 



Specimens examined. — 606, from 106 localities. Large series con- 

 taining both sexes are to be found in the collections of the author, 

 the American Museum of Natural History, and the University of 

 Kansas. At least one quarter of all the specimens accumulated for 

 this study eventually proved to be A. popeanellus, and the number of 

 specimens available for study has made it advisable to reduce the 

 distributional data for this common species simply to the localities 

 and months of occurrence: 



Alabama: Gurley (July); Huntsville (July); Valley Head (Aug.). Arizona: 

 Chiricahua Mountains (July) ; Douglas (Aug.) ; San Bernardino Ranch, Cochise 

 Co. (Aug.); Tombstone (Aug.); Tucson (July). Arkansas: Camp Chaffee 

 (Aug.); Hope (Aug.). Florida: Key Largo (Aug.); Sanford (June); Winter 

 Park (May, June). Georgia: Bainbridge (Sept.); Catoosa Co. (Aug.); Clarke 

 Co. (Aug.); Screven Co. (July, an unusually small ?); Tallapoosa (July). Il- 

 linois: Champaign-Urbana (June and July, both sexes very common at light) ; 

 Dubois (July) ; Havana (June) ; Homer Park, Homer (June, July) ; Lawrenceville 

 (Sept.); Murphysboro (Aug.); Oakwood (July); Palos Park (July); Parker (July). 

 Peoria (June, July); Putnam County (June, July, Aug.); Quincy (June). 

 Indiana: Putnamville (July); Tremont (June). Iowa: Denison (June); Des 

 Moines (July, Aug.); Linn Co. (no date); Sioux City (June, July). Kansas: 

 Barton County (June); Bourbon Co. (no date); Caldwell (May, June, Aug.); 

 Clark Co. (May, June) ; Decatur Co. (July) ; Douglas Co. (June and July, 2 cf c?" 

 with mites on abdomen) ; Gove Co. (no date) ; Linn Co. (no date) ; Manhattan 

 (June) ; Medora (June) ; Ness Co. (July) ; Onaga (July) ; Republic Co. (July) ; 

 Riley Co. (July) ; Scott City (June) ; Scott Co. (June, 1 cf with mite on eye) ; 

 Sheridan Co. (no date); Topeka (no date). Kentucky: Harrodsburg (Aug.), 

 Mississippi: Starkville (July) ; A. & M. College, State College (Aug.). Missouri: 

 Brentwood (June); Kirkwood (May, June, July); Mineola (July); Ranken (June); 

 St. Louis (July); Webster Groves (July); Willard (June). Nebraska: Lincoln 

 (June, July, Aug.). New Jersey: Vineland (no date). New Mexico: Artesia 

 (July) ; Carlsbad Caves, Carlsbad (July) ; Chaves Co. (July) ; Deming (July) ; 

 Eddy Co. (July) ; Las Cruces (Aug.) ; Lordsburg (Aug.) ; Mesilla (July) ; State 



