584 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 114 



Specimens examined. — 11 (10 cf^ cT, 1 9), from 4 localities: 



Arizona: Douglas, Cochise Co., d' (July 1-7, collector unknown); Paradise, 

 Cochise Co., cf (June, collector unknown). New Mexico: Las Vegas, San 

 Miguel Co., 8 cf cf (no date, Andreas Bolter collection). Texas: Locality and 

 date unknown, ? ("Tex.," Andreas Bolter collection). 



Remarks. — This species undoubtedly ranges southward into Mexi- 

 co. The single 9 listed above has been only tentatively associated 

 with haldufi. The latter is very closely related to the complex species 

 macrogaster, the two comprising a rather unusual species group among 

 the acrolophids, exhibiting great diversity in regard to cephalic struc- 

 tures. The labial palpi may be elongate or shortened, while the eyes 

 may be naked or setose. Further, the antennae may be laminate, uni- 

 pectinate, or bipectinate. However, the various members of the 

 macrogaster-baldufi species group are bound together by their nearly 

 identical genital structm^es. These include the distinctive combina- 

 tion of a bifid uncus and a fused gnathos. Acrolophus haldufi may 

 be easily distinguished from its close relatives by its shortened labial 

 palpi and strongly unipectinate antennae. Likemse, it may be sepa- 

 rated from the remaining members of the genus by its characteristic 

 harpe and aedeagus. The genital characters are consistent through- 

 out my rather small series representing haldufi. 



Acrolophus haldufi exhibits certain affinities with at least two Mexi- 

 can species in this genus. At the U.S. National Museum there is a 

 slide preparation of the cf genitalia of a specimen labeled "Acrolophus 

 echinon Druce, Mexico City, Mexico, R. Muller #2075." The geni- 

 talia on this slide are quite similar to, although not identical with, 

 those of haldufi. Also at the National Museum is a sHde preparation 

 of cf genitalia labeled "Acrolophus harbipalpus Busck, Paratype, 

 Tehuacan, Mexico." The genitaha on this slide are somewhat simi- 

 lar to those of haldufi. However, the adults of harhipalpus, the type 

 cf of which is also at the National Museum, and haldufi are externally 

 quite distinct. This species is named in honor of Walter V. Balduf, 

 Professor of Entomology at the University of Illinois. 



17. Acrolophus arizonellus Walsingham 



Figures 95-99 



Acrolo-phus arizonellus Walsingham, 1887, Trans. Ent. Soc. London, p. 153, pi. 7, 

 fig. 10, June. — Smith, 1891, List Lep. Bor. Amer., p. 94, no. 5053. — Dyar, 

 1900, Can. Ent., vol. 32, no. 10, pp. 308-309; 1903, List North Amer. Lep., 

 p. 578, no. 6588.— Walsingham, 1915, Biol. Cent.-Amer., pt. 12, vol. 4, 

 p. 391. — Barnes & McDunnough, 1917, Check List Lep. Bor. Amer., p. 191, 

 no. 8174.— McDunnough, 1939, Check List Lep. Can. & U.S. Amer., p. 103, 

 no. 9560. 



