674 PROCEEDINGS OF THE NATIONAL MUSEUM vol. ii* 



with laterodextral wall flattened, rather weakly sclerotized, and armed 

 with several series of spines as follows (fig. 212): basal series arising 

 from broader portion of aedeagus and consisting of dense cluster of 

 approximately 15-30 heavily sclerotized, acute, variously sized spines 

 directed and becoming progressively larger distad; central series con- 

 sisting of single, irregular, dorsal row of several to several dozen 

 smaller, variously sized spines extending from basal cluster almost 

 to apex of aedeagus; apex armed with single, rather small, distinct, 

 well sclerotized, acute spine directed distad. 



Vesica small, membranous, bulbous, armed at or near apex with 

 single (rarely two) cornutus; cornutus small, well sclerotized, acute, 

 directed distad. 



Type. — c? and 9 types in the British Museum (Natural History). 



Type locality. — "Arizona." 



Distribution. — Southwestern United States. Kansas and Texas 

 westward to California and southward into Mexico and Central 

 America. 



Specimens examined. — 291, from 55 locahties. The large number 

 of specimens available for study has made it advisable to reduce the 

 distributional data for this common species largely to the localities 

 and months of occurrence : 



Arizona: Aguila (Aug.) ; Baboquivari Mountains ("Kits Peak Rincon," Aug., 

 elevation about 3100 to 4050 feet); Baboquivari Mountains (no date); Badger, 

 Santa Cruz Co. (July) ; "Bill Wms. Fork" (Aug.) ; Boulder Springs, Mohave 

 County (July) ; Chiricahua Mountains (July, elevation 8000 to 9800 feet) ; Dome 

 (July); Elgin (July); Flagstaff (July); Florence (July), (also, "6 miles south of 

 Florence," July); Fort Huachuca (Aug.); Garces (Aug.); Gila Bend (Aug.); 

 Huachuca Mountains (Ramsay Canyon, July); Hualapai Mountains (July); 

 McNary, White Mountains (July) ; Oracle (July), (also, "14 miles east of Oracle," 

 July, 1 9 with mite on abdomen) ; Palmerlee (no date) ; Paradise, Cochise 

 County (Aug.); Patagonia (July, Aug.); Pinal Co., "3 miles west of Magna" 

 (Aug.); San Bernardino Ranch, Cochise Co. (Aug., elevation 3750 feet); San 

 Carlos (July) ; Santa Catahna Mountains (Pepper Sauce and Sabino Canyons, 

 Aug.) ; Santa Cruz Co. (Aug.) ; Santa Rita Mountains (June and July, elevation 

 5000 to 8000 feet), (Florida Canyon, Aug.), (Santa Rita Experimental Range, 

 July) ; Superior (Boyce Thompson Arboretum, Aug.) ; Tombstone (Aug.) ; Tucson 

 (July, Aug., Oct.), (July, at light, elevation 2400 feet), (St. Xavier National 

 Monument, Tucson, July and Aug., 1 cf unusually small) ; Tumacacori National 

 Monument, Santa Cruz Co. (July); Wellton (Aug.). California: Fort Yuma 

 (Aug.) ; Mountain Springs (Aug.) ; Palm Springs (Oct.) ; Rancho La Sierra, 

 Riverside Co. (Aug., Sept.); San Diego (May, July, Aug.). Canada: One cf, 

 with genitalia missing, from the Cahfornia Academy of Sciences, labeled "Ontario, 

 Canada, Aug., 1909, W. G. Palmer collector." This record is extremely question- 

 able. Colorado: Mesa Verde National Park (July) ; Paonia (June and July, 

 light trap). Kansas: Stanton Co. (July, elevation 3000 feet). Mexico: San 

 Carlos Bay, Gulf of California (July). Nevada: Pyramid (July). New Mexico: 

 Lordsburg (July); Luna Co., "10 miles east of Deming" (July); Mesquite, near 

 Mesilla Park (July); State College (July). Texas: Davis Monument (Aug.); 

 Fort Davis (July); Marathon (July). 



