NORTH AMERICAN ACROLOPHIDAE — ^HASBROUCK 639 



On the underside of the thorax just under the forewing is a large, dense tuft of 

 ochreous gray hairs, which can be erected so as to obscure the sides of the head 

 and the base of the forewings. 



Alar expanse. — 10-12 mm. 



The females which were repeatedly taken in copulation with the males are 

 considerably larger and with more pointed wings and rather lighter in general 

 color. The labial palpi are hardly as long as in the males and more porrected. 

 They have no thoracic tufts. 



Alar expanse. — 17-21mm. 



Habitat. — Alhajuela, Cabima, Trinidad River, Tabernilla, Paraiso, and Corozal, 

 Panama. April, May and June. 



Type- specimen. — Cat. No. 16771, U.S.N. M. 



In a series of more than sixty males, hardly two are quite alike and the different 

 state of preservation adds much to the variation, but the general habitus, as well 

 as the structural characters, makes it easy to place the species, which appears to 

 be close to A. ridicula Meyrick, described from a unique male from Dutch Guiana_ 



Male genitalia. — Vinculum typical, as in other species. 



Tegumen with lateral arm of medium length and width, margins 

 subparallel, sparsely and weakly punctate; dorsal area broad, glabrous, 

 cephalic margin linear (not emarginate), cephalic portion upraised, 

 caudal margin produced caudad to fill mesal emargination in base 

 of uncus. 



Harpe simple. Lateral aspect: broadest in area of costa and 

 sacculus giving rise to arm of transtilla. Costa and sacculus fused, 

 broad, narrowing gradually in basal and apical areas, comprising 

 slightly more than basal half of harpe, glabrous except for punctate 

 and setose ventrocaudal margin of sacculus. Cucullus indistinctly 

 fused with costa and sacculus, directed somewhat ventrad, apical 

 two-thirds sparsely and coarsely punctate and setose (especially 

 entad and along margins), mesal portion constricted ventrad, ventral 

 margin thickened and irregular; dorsal margin thin, smooth, and 

 sublinear; apical third slightly expanded; apex broad, with irregular 

 margin, ventral portion evenly rounded, dorsal portion subtruncate. 



Transtilla with arm well sclerotized, glabrous, rather broad, less 

 than one-fourth as long as harpe, widely separated from costal margin, 

 terminating a little above base of harpe. 



Uncus very obscurely bifid. Dorsal aspect: base separated from 

 tegumen by narrow area of reduced sclerotization, cephalic margin 

 broadly emarginate mesad, mesal area glabrous; lateral areas heavily 

 sclerotized, sparsely punctate and setose, gradually converging distad 

 and smoothly fusing into bases of furcae; angle of bifurcation extremely 

 acute and obscure, located beyond midpoint of main uncal process; 

 furcae short, approximate, appearing as single process (especially in 

 untreated specimens), heavily sclerotized, directed caudad and slightly 

 ventrad, lateral margins sparsely punctate and setose, apices acute 

 and very slightly divergent. 



