398 U. S. NATIONAL MUSEUM BULLETIN 216 



Flagellum uniformly colored or with a broad pale subapical band; 

 temporal orbit white or pale yellow; second through fourth tergites 

 with a narrow, whitish, complete or subcomplete apical margin; sev- 

 enth tergite of female fulvous, or black with an apical band that is of 

 rather uniform width except for a median interruption (figs. 317, a,b). 



This group includes two Nearctic species, one from the southern 

 Rocky Mountains and the other from the Carolinian fauna. 



1. Rhyssa howdenorum, new species 

 Figure 317,a 



Front wing of male about 11 mm. long, of female 10 to 13 mm. 

 long; hairs on second tergite rather sparse, their sockets separated by 

 about twice the length of the hairs. 



Black. Face (except in female for a broad, black, vertical stripe 

 under each antenna) , orbits (interrupted at top and at bottom of eye) , 

 clypeus, palpi, median, anteroventral, and dorsal parts of pronotal 

 margin, tegula, subtegular ridge, usually a small spot on mesepister- 

 num next middle coxa, mesepimeron, often postscutellum and apex of 

 scutellum, often a small spot in upper hind corner of metapleurum, 

 lateroapical spot on propodeum, and narrow apical band on first to 

 seventh tergites, ivory, the apical bands on tergites curved forward 

 on sides to an increasing degree toward hind segments and sublaterally 

 with a more or less distinct brown area that sometimes interrupts the 

 bands, apical ivory band on seventh tergite of female of uniform 

 width except for a median interruption ; eighth tergite of female mar- 

 gined with ivory except medially; mesosternum, usually metasternum, 

 usually lower 0.6 ± of mesepisternum, usually metapleurum, and legs 

 fulvous, the tibiae paler at base, the hind tibia infuscate except at 

 base, and the hind tarsus fuscous, its first segment paler at base; 

 wings hyaline, faintly infuscate around apex of radial vein. 



The name of the species is for Henry and Anne Howden, two in- 

 defatigable entomologists who collected one of the paratypes. 



Type: 9, reared from Pinus virginiana, Minora Hill, Falls Church, 

 Va., May 10, 1913, Wm. Middleton (Washington, USNM 63718). 



Paratypes: 9, Halsey, Nebr., July 31, 1957, R. Henzlik (Washing- 

 ton). 9, Raleigh, N. C, Apr. 29, 1938 (N. C. State College at Ral- 

 eigh). d\ Raleigh, N. C, June 5, 1953, H. and A. Howden (Townes). 

 9, Wake Co., N. C, May 10, 1950, H. Townes (Townes). cf , reared 

 from Pinus, Minora Hill, Falls Church, Va., Apr. 22, 1913, Wm. 

 Middleton ( Washington) . 



The species is known from the Carolinian fauna of Virginia, North 

 Carolina, and Nebraska. 





