640 PROCEEDINGS OF THE NATIONAL MUSEUM vol. ii4 



Gnathos fused, rather short and broad, directed caudoventrad, 

 dorsal portion heavily scobinate; lateral margins well sclerotized, 

 evenly converging to broadly rounded apex. 



Anellus large, membranous, unarmed, juxta absent. 



Aedeagus of medium length and width, somewhat shorter than 

 harpe, cylindrical, asymmetrical, glabrous, sublinear in dorsal and 

 ventral aspects, slightly sinuate in lateral aspect, approximate basal 

 third broadly expanded laterad and dorsad, approximate basal fourth 

 opening broadly dorsad, extremity of base markedly emarginate 

 mesoventrad, apex opening broadly; apical extremity of aedeagus 

 consisting of very slender, weakly sclerotized extension curving 

 gradually ventrad and terminating in rather small, acute, well scle- 

 rotized, spinelike process superficially appearing as cornutus of adja- 

 cent vesica. 



Vesica rather small, membranous; unarmed, but attached to and 

 appearing to bear spinelike process of extension of aedeagus. 



Type. — Type & (type no. 16771) in the U.S. National Museum. 



Type locality. — Cabima, Panama, Central America. 



Distribution. — Panama northward into eastern United States. 

 North Carohna and New Jersey. 



Sources of material. — American Museum of Natural History 

 (1 &); U.S. National Museum (1 d", 1 9). 



Specimens examined. — 3 (2 cf cf, 1 9), from 2 localities: 



New Jersey: New Lisbon, Burlington Co., d^ (July 17, 1931, at light, E. P. 

 Darlington), 9 (July 14, 1932, at light, Darlington). North Carolina: Max- 

 ton, Robeson Co., cf (no date, A. B. Klots). 



Remarks. — This small species is recorded here from the United 

 States for the first time. It is not closely related to any of the other 

 acrolophids known to occur in America north of Mexico. A. panamae 

 is related to that series of species having shortened labial palpi and 

 a type of antenna in which each segment is clothed only dorsad or 

 dorsolaterad with scales. Aside from these general features, panamae 

 may be distinguished from the other members of the genus by its 

 naked eyes, fused gnathos, and very obscurely bifid uncus. It may 

 be further distinguished from its congeners by its harpe and aedeagus, 

 the vesica of the latter structure being unarmed. The genitalia of 

 panamae are suggestive of those of furcatus, especially in regard to 

 their respective unci and aedeagi. However, the harpes and antennae 

 of the two species are quite distinct. 



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

 It is labeled "Acrolophus panamae Busck, type no. 16771, Cabima, 

 Panama, May 1911, August Busck." My examination of a slide 

 preparation of the cf genitalia of a "cotype" of panamae from Rio 

 Trinidad, Panama, further confirmed the identity of this species. 



