NORTH AMERICAN ACROLOPHIDAE — ^HASBROUCK 587 



addition, the vesica of the aedeagus in arizonellus is armed with a 

 single row of minute cornuti as compared with the miarmed vesica of 

 luriei. The genital characters of arizonellus are quite consistent 

 throughout my series of this species. 



Among my specimens representing this species is an atypical cf , 

 collected along with a series of normal c^ d^ at Patagonia, Ariz., 

 exhibiting abnormal or deformed genitalia. The moth itself is 

 smaller and darker than the typical form and its forewings have a 

 simpler or reduced color pattern. The genital capsule is approximately 

 two-thirds as large as that of the typical form. The furcae of the 

 uncus, although in themselves normally constructed, are widely sepa- 

 rated by a very broadly and evenly rounded angle of bifurcation. This 

 condition represents a marked divergence from the normal form of 

 arizonellus. Although the harpes of the abnormal specimen are 

 asymmetrical, they exhibit the characteristic angular condition at 

 the ventrocaudal extremity of the sacculus. The left harpe is fairly 

 typical, but the cucullus of the right harpe is unusually narrow, 

 especially so distad, and its ventral margin becomes increasingly 

 dentate distad. The vesica of the aedeagus is armed with only two 

 cornuti, one several times larger than the other, situated near its 

 apex. The cornuti are elongate, slender, and finely acute. Aside from 

 being relatively smaller, the other genital structures, namely the 

 vinculum, tegumen, gnathos, anellus, and aedeagus, seem to be fairly 

 normal in form. To some extent, this atypical specimen represents a 

 transitional form between arizonellus and luriei. 



According to Carl Heinrich (1946, in litt.) the holotype of this 

 species is in the U.S. National Museum. However, I could not 

 locate a holotype for arizonellus at that institution in May of 1951. 

 On the other hand, Mr. Tams of the British Museum (Natural History) 

 has sent me photographs labeled ^'arizonellus Wals., type." These 

 photographs show the adult cf and 9 but only the genitalia of the 

 latter. The adults pictured agree well with my specimens represent- 

 ing arizonellus. Although a photograph of the cf genitalia is not 

 available, Walsingham's illustrations of the cf genitalia accompanying 

 his original description of arizonellus reasonably confirm the identity of 

 this species. The U.S. National Museum does have several slides of 

 (^ genitalia labeled '^arizonellus Wlsm." These agree with my concept 

 of this species. 



Dyar (1900) listed the following distributional data for arizonellus: 

 "Tucson, Ai'izona, July 19, 20 and 21 (E. A. Schwarz); Mesilla, 

 New Mexico, June 25 and July 1 (T. D. A. Cockerell)." 



