390 U. S. NATIONAL MUSEUM BULLETIN 216 



3. Genus Neoxorides 



Figure 302,a 



Neoxorides Clement, 1938, Festschrift zum 60. Geburtstage von Professor Dr. 

 Embrik Strand, vol. 4, p. 517. Type: Xorides nitens Gravenhorst; original 

 designation. 



Front wing 7 to 14 mm. long; clypeus small, quadrate, about 1.5 as 

 wide as long, convex basally, the rest impressed, its apical margin 

 subtruncate; mandible short, its apex chisel shaped, without teeth; 

 temple in profile about 0.6 as long as eye, its upper half coarsely 

 scabrous; mesoscutum strongly trilobed; notauli strong, approximate 

 on disc of mesoscutum; areolet absent, the intercubitus about 0.4 as 

 long as second abscissa of cubitus; nervulus opposite basal vein; 

 tarsal claws simple, moderately curved; first tergite about 2.0 to 3.0 

 as long as wide; second and third tergites subpolished, mat, micro- 

 scopicall}'- transversely aciculate, with fine punctures, weak punctures, 

 or often not distinctly punctate. 



We have seen six species of this genus: The European Xorides nitens 

 Gravenhorst 1829, the Palaearctic Xorides collaris Gravenhorst 1829, 

 the Japanese Xorides matsuyamensis Uchida 1928, and the three 

 Nearctic species described below. 



Key to the Nearctic species of Neoxorides 



1. Mesopleurum with a broad white longitudinal stripe in its lower half; mesoscu- 



tum with two pairs of longitudinal white dashes; mesopleurum and meta- 



pleurum punctate and subpolished 3. caryae (Harrington) 



Mesopleurum entirely black; mesoscutum entirely black 2 



2. Second to fourth sterna of male with four longitudinal sclerites that are sepa- 



rated by narrow membranous joints ; second and third tergites of female with 

 hairs moderately dense, separated by about 0.8 their length; mesopleurum 

 and metapleurum mat, not distinctly punctate . . 1. pilulus, new species 

 Second to fourth sterna of male with a single large sclerite; second and third 

 tergites of female with hairs very sparse, separated by about 2 to 3 times 

 their length; mesopleurum and metapleurum weakly mat, with distinct 

 punctures 2. borealis (Cresson) 



1. Neoxorides pilulus, new species 



Front wing 4.4 to 9.5 mm. long; head more spherical than usual 

 for the genus; mesopleurum and metapleurum mat, their punctures 

 fine, weak, and inconspicuous; first tergite of male about 2.2 as long 

 as wide, of female about 1.65 as long as wide; second and third tergites 

 mat, usually with weak, rather dense punctures; hairs on tergites 

 moderately dense, separated by about 0.8 their lengths; last tergite of 

 female moderately long; second through fourth sterna of male with 

 four longitudinal sclerites; ovipositor sheath about 0.67 as long as 

 front wing. 



