NORTH AMERICAN ACROLOPHIDAE — HASBROUCK 577 



of the New Mexican bipectinicornus are intermediate in length and 

 extend only onto the anterior margin of the thorax. The basal 

 segment is slightly longer than the central segment, while the apical 

 segment is considerably reduced and less than two-thirds as long as 

 the central segment. The eyes are not setose in bipectinicornus. 



The two remaining subspecies, unipectinicornus and laminicormis, 

 are similar to macrogaster except that their antennae are either 

 unipectinate or laminate but never bipectinate. They may be 

 distinguished from the New Mexican subspecies, bipectinicornus, 

 in three ways: they lack bipectinate antennae; their eyes are obviously 

 setose; and their labial palpi are longer and exhibit an apical segment 

 longer than either the basal or central segments. 



These last two subspecies may be separated from each other by 

 their antennal structure. One, unipectinicornus, represented by 

 four cf cf from Paradise and Douglas, Arizona, exhibits distinctly 

 unipectinate antennae. The other, laminicornus, apparently the 

 most prevalent of all and represented by thirteen cf cf and one 9 

 from Tucson, Badger, and Patagonia, Arizona, has simple, laminate 

 antennae. 



The genitalia of unipectinicornus and laminicornus are essentially 

 the same; the differences between the two subspecies are no greater 

 than the variation exhibited within either one. The genitaha of the 

 unique specimen from New Mexico, bipectinicornus, differ from the 

 above in that the gnathos is considerably broader and is not cleft at the 

 apex, and the central portion of the uncus and the cucullus of the harpe 

 are noticeably broader in lateral aspect. The British Museum 

 photograph of the cf genitalia of macrogaster is not in sufficient detail 

 to show any appreciable differences between that subspecies and the 

 three available for study. 



The members of this complex show considerable variation in size 

 and color pattern. The characteristic whitish patch on the posterior 

 margin or "fold" of the forewing is usually present but varies in size 

 and shape. It is sometimes greatly reduced, however, and is almost 

 obsolete in bipectinicornus. Fiu'ther collecting may show that 

 geographical separation does not exist between two or more of these 

 subspecies, thus reducing them to forms. Additional material may 

 also show complete intergradation between two or more of the sub- 

 species, thus reducing them to synonyms. 



Key to Subspecies of the A. macrogaster Complex 



(Based on Males) 



1. Antennae bipectinate 2 



Antennae unipectinate or laminate 3 



