666 PROCEEDINGS OF THE NATIONAL MUSEUM vol. ii4 



third somewhat expanded, opening both dextrad and sinistrad, con- 

 sisting of well sclerotized dorsal and ventral walls; dorsal wall of apical 

 third glabrous, rather slender, narrowing to subacute apex; ventral 

 wall of apical third broader and armed with numerous, small, acute, 

 well sclerotized, spinelike processes directed distad. 



Vesica rather small, membranous, unarmed. 



Type. — Type cf (type no. 407) in the U.S. National Museum. 



Type locality.- — "Arizona." 



Distribution.- — Southwestern United States. Arizona. 



Sources of material.- — American Museum of Natural History 

 (25 cf cf', 2 99); California Academy of Sciences (4 cJ'cf); Carnegie 

 Museum (2 cfcf); University of Kansas (1 d^). 



Specimens examined.- — 34 (32 cfcf, 2 99), from 9 locahties: 



Arizona: Chiricahua Mountains, Cochise Co., 2 cfcf' (Rustler Park, July 15, 

 1927, elevation 9000 feet, J. A. Kusche), cf (Flys Peak, July 18, 1927, elevation 

 9000 to 9800 feet, Kusche), d" (July 30, 1927, elevation 9000 to 9800 

 feet, Kusche); Chiricahua National Monument, Cochise Co., <f, 9 (July 

 15, 1948, C. & P. Vaurie); Garces, cf (Sept. 12, Biederman); Huachuca 

 Mountains, 8 cfcT, 9 (Ramsay Canyon, July 10-15, 1941, one cp with mite on 

 abdomen, A. B. Klots); Huachuca Mountains, Cochise Co., c? (Ramsay Canyon, 

 July 16, 1948, C. & P. Vaurie); Paradise, Cochise Co., cf (Aug., O. C. Poling); 

 Portal, Cochise Co., cf (Cave Creek Canyon, July 13, 1948, C. & P. Vaurie); 

 Prescott, Yavapai Co., 14 d'd' (July 25, 1948, C. & P. Vaurie); Santa Rita 

 Mountains, cf (July, elevation 5000 to 8000 feet, F. H. Snow). 



Remarks. — This is Beutenmiiller's only valid species of Acrolophus 

 described from America north of Mexico. It undoubtedly ranges 

 southward into Mexico. It is related to those acrolophids having 

 shortened labial palpi, naked eyes, and antennae covered only dorsad 

 or dorsolaterad by scales. A. davisellus is very closely related to 

 serratus, the two comprising a small species group. As characterized 

 in the key, this group consists of robust species in which the labial palpi 

 are recurved and rather closely appressed to the head, the sacculus of 

 the harpe is developed mesoventrad into a prominent process usually 

 visible in ventral aspect in dried specimens, the gnathos is rather 

 weakly paired and flattened beneath, and the uncus is simple. 



A. davisellus may be easily distinguished from its close relative, 

 as well as from the other acrolophids treated here, by its short labial 

 palpi, laminate antennae, color pattern, moderately capitate harpe, 

 and spinose aedeagus. These features are described in more detail 

 in couplet 53 of the key. The genital characters of davisellus are con- 

 sistent throughout my series of specimens. 



I have examined the type d^ specimen at the U.S. National Museum. 

 It is labeled ''Acrolophus davisellus Beut., type no. 407, Arizona, 339, 

 Through C. V. Riley." This specimen confirms the identity of this 

 species. Contrary to the brief comment accompanying the original 



