576 PROCEEDINGS OF THE NATIONAL MUSEUM vol. ii4 



jpopeanellus. I have not seen the type 9 which is now in the collec- 

 tion of the Academy of Natural Sciences in Philadelphia. Darlington 

 (in litt., 1946) has reported: "busckellus Haim. Type. In perfect 

 condition, unable to determine sex." 



Haimbach's description and photograph are identical with a small 

 series of specimens I have received from New Jersey (including 

 Forbes' specimens from Brown's Mills), Georgia, and Alabama. The 

 genitalia of these moths are identical with those of my large series of 

 specimens previously determined as A. propinquus (Walsingham) . 

 The latter species has a wide range in the eastern United States with 

 a number of rather striking geographical variations in both size and 

 color pattern, although these invariably present essentially the same 

 genital structure. A. propinguus has been described as new at least 

 four times from North America, with husckellus (9) (Haimbach) as its 

 most recent sjmonym and perhaps its most striking color variation. 



15. Acrolophus niacrogaster (Walsingham) 



In the southwestern United States three groups of moths exhibit 

 essentially the same genital structure (see following description and 

 illustrations) as shown in my copy of a British Museum photograph 

 of genitalia labeled "macrogaster Wals., type cf," described from 

 Arizona. Their genitaha also agree with Walsingham's rather brief 

 diagnosis of the cf genitalia in his original description of macrogaster. 

 Despite this great similarity of genitalia throughout the complex, 

 the three groups may be easily separated from one another, as well 

 as from Walsingham's original conception of macrogaster, by external 

 differences occurring in the antennae, labial palpi, and eyes. On the 

 basis of limited material available for study, these differences among 

 the structures of the head appear to be both nonintergrading and 

 geographical in nature, thus indicating the presence of four sub- 

 species. Three of these are described below as new under the names 

 hipectinicomus , unipectinicornus , and laminicornus, names derived 

 from the type of antennal structure peculiar to each of the subspecies. 



According to the original description, Walsingham's cf macro- 

 gaster has a combination of the genitalia described below, bipectinate 

 antennae, and labial palpi which are recm'ved, elongate, and "reaching 

 nearly to the posterior edge of the thorax." However, I have seen no 

 specimen with this combination of characters. 



A unique cf specimen, bipectinicornus, from the U.S. National 

 Museum, labeled "Colora'o, N.M., at light, July 10 (Ckll.) B 59," 

 perhaps represents the closest approach I have seen to Walsingham's 

 macrogaster. This specimen also has strongly bipectinate antennae, 

 although the pectinations are not "wider at their bases than out- 

 wardly" as stated in his description. In addition, the labial palpi 



