NORTH AMERICAN ACROLOPHIDAE — HASBROUCK 519 



48. Antennae unipectinate; with each segmental process (fig. 181) subcircular, 



developed ventrad rather than laterad, somewhat thickened in lateral 



aspect 39a. sinclairi sinclairi, new subspecies 



Antennae reduced bipectinate; with eacli segmental process (fig. 185) some- 

 what emarginate mesad, developed strongly laterad into pair of secondary 

 processes narrowly rounded at apices, quite slender in lateral aspect. 



39b. sinclairi nelsoni, new subspecies 



49. CucuUus of harpe with ventral margin prominently dentate (fig. 186), densely 



clothed with stout setae; gnathos distinctively paired, with angle of bifur- 

 cation between arms broadly and evenly rounded (figs. 188, 189); arms 

 of gnathos elongate, divergent, with apical halves narrowing and becoming 

 very heavily sclerotized distad (fig. 188). 



40. quadrellus (Barnes and McDunnough) 



CucuUus of harpe with ventral margin smooth, not setose as above; gnathos 



single or paired, but never as above 50 



50. Antennae reduced bipectinate; with each segmental process (fig. 190) some- 



what emarginate mesad, developed strongly laterad into pair of secondary 

 processes rounded at apices; aedeagus with apical margin produced into 10 

 or 12 small, unequally sized, finely acute, spinelike processes (fig. 195). 



41. minor (Dyar) 



Antennae laminate or reduced unipectinate, but with segmental processes 



never developed laterad; aedeagus with apical margin not produced as 



above 51 



51. CucuUus of harpe with major central portion markedly flattened dorsoventrad 



and appearing quite slender in lateral aspect (fig. 196), costa of harpe 

 produced dorsocaudad into distinct costal process (fig. 196); uncus ob- 

 scurely bifid, with furcae very closely appressed and superficially appearing 

 as single process with median longitudinal suture. 



42. parvipalpus, new species 



CucuUus of harpe not flattened dorsoventrad, costa of harpe without process; 



uncus single 52 



52. Robust species; labial palpi recurved, rather closely appressed to head, with 



normal vestiture; sacculus of harpe developed mesoventrad into prominent 

 process usually visible in dried specimens in ventral aspect (figs. 200, 203); 

 gnathos rather weakly paired, flattened beneath; (davisellus-serratus species 



group) 53 



Rather fragile species; labial palpi erect, not appressed to head, each segment 

 clothed with prominent tuft of scales along anterior margin; sacculus of 

 harpe without mesoventral process; gnathos fused (fig. 210), concave 

 beneath, hood-shaped (fig. 219); (variabilis-seculatus-macrophallus-vauriei 

 species group, in part). [See couplet 31 for seculatus] 54 



53. Labial palpi short, e.xtending only about as far as antennal bases; antennae 



laminate, with segmental processes laterally flattened and contiguous; 

 forewings heavily suff"used with grayish white; cucuUus of harpe with apical 

 portion expanded, moderately capitate (fig. 199) ; sacculus of harpe broadly 

 separated caudad from its mesoventral process (figs. 199, 200); apical 

 portion of aedeagus heavily armed ventrad with spinelike processes (fig. 



201) 43. davisellus Beutenmiiller 



Labial palpi of intermediate length, extending onto anterior margin of thorax; 

 antennae transitional between laminate and unipectinate, with segmental 

 processes somewhat thickened transversely and not contiguous; forewings 

 brownish, not suffused with grayish white; cucuUus of harpe very slender, 

 with apical portion not appreciably expanded (fig. 202) ; sacculus of harpe 

 676-573—64 3 



