238 U. S. NATIONAL MUSEUM BULLETIN 216 



5. Eruga, new genus 



Figure 294,b 



Front wing 2.8 to 4.0 mm. long; eye bare; clypeus small, broadly 

 elliptic, separated from face by a broad groove, strongly convex both 

 transversely and longitudinally; epomia entirely absent; mesoscutum 

 polished, almost or quite hairless; notaulus represented by a rather 

 short, weak depression ; prepectal carina complete, its upper end rather 

 distant from front edge of mesopleurum; pleural carina of propodeum 

 complete; median carinae of propodeum absent or vestigial; areolet 

 absent; intercubital 0.1 to 0.3 as long as second abscissa of cubitus or 

 obliterated by the approximation of the cubital and radial veins; 

 nervulus postfurcal by 0.3 to 0.5 its length; discoidella present but 

 weak, or sometimes absent; first tergite moderately long; second to 

 fourth tergites rather short, polished or subpolished, with sparse or 

 very sparse hairs, with a broad, weak, postmedian transverse im- 

 pression and a less distinct basal transverse impression; ovipositor 

 sheath about 1.5 as long as apical depth of abdomen; ovipositor with 

 a swelling at, or just before its middle, abruptly tapered thence toward 

 point, the apical 0.4 of ovipositor very slender and faintly upcurved 

 (fig. 332,g). 



Genotype: Eruga lineata, new species. 



The name is from the Latin ex (without), plus ruga (wrinkle), re- 

 ferring to the absence of the epomia. 



Besides the three Nearctic species described below, this genus 

 includes the Madagascan Acrodactyla erratica Seyrig 1932 and A. 

 viatrix Seyrig 1932, the Belgian Congo Acrodactyla lubumbashica 

 Benoit 1953, A. pau lisiana Benoit 1953, and A. rutshurica Benoit 1953, 

 and an undescribed species from Ecuador. 



Key to the Nearctic species of Eruga 



1. Mesoscutum entirely black; hind coxa black except at apex. 



1. atrata, new species 

 Mesocutum partly or entirely pale; hind coxa pale 2 



2. Mesoscutum blackish, with longitudinal yellow stripes; hind tarsus moderately 



long, its third segment about 2.7 as long as deep . . 2. lineata, new species 



Mesoscutum fulvous, with indistinct yellow areas; hind tarsus rather short, 



its third segment about 2.0 as long as deep .... 3. rufa, new species 



1. Eruga atrata, new species 



Front wing 3.5 to 3.9 mm. long; propodeum moderately convex, 

 weakly mat, finely rugulose medially and laterally; hind tarsus long, 

 its third segment about 4.0 as long as deep; first tergite about 1.75 

 as long as wide in male, about 1.58 as long as wide in female. 



Black. Scape and pedicel blackish brown, the apex of pedicel 

 yellowish; mandible brown; palpi, tegula, hind corner of pronotum, 



