ICHNEUMON-FLIES OF AMERICA: 1. METOPIINAE 63 



convex to flat; occipital carina very close to or distant from foramen 

 magnum, extending ventrally to below center of foramen magnum 

 and often complete to the hypostomal carina; prepectal carina, if 

 complete above, angled strongly forward just above sternaulus almost 

 to reach front edge of mesopleurum, then paralleling front edge of 

 mesopleurum to near subtegular ridge; second recurrent vein with one 

 bulla; hind femur about three times as long as deep; tarsal claws on 

 front and middle tarsi apparently simple, or pectinate on basal 0.3; 

 first tergite in profile various, weakly rounded to pyramidally elevated 

 with a straight dorsal face and straight or somewhat concave antero- 

 dorsal face; male clasper convex, without a lateral ridge. 



This subgenus is of almost worldwide distribution. Clement (1930, 

 Konowia, vol. 8, pp. 347-365) treats nine Palaearctic species under the 

 subgeneric name Peltopius; and Metopius (Metopius) velutinus 

 Clement, 1929, also appears to be correctly placed in the subgenus 

 Metopius. Metopius rufus Cameron, 1905, and Metopius browni 

 Ashmead, 1906, are representatives of a distinct Indo-Australian 

 species group which we consider a part of the subgenus Metopius. 

 Metopius femoratus Cresson, 1874, from Mexico also belongs in this 

 subgenus. We have two unidentified species of the subgenus from 

 Africa, and there are six Nearctic species, as treated below. 



All the Nearctic species have certain characters in common which 

 are enumerated here to escape the need to cite them under the 

 individual species. Facial shield ventrally rounded or sub truncate; 

 temple moderately convex; occipital carina moderately close to fora- 

 men magnum, complete below; prepectal carina complete above; 

 flagellum of moderate thickness, its wider segments about 1.7 as 

 wide as long. 



Key to the Nearctic species of the subgenus Metopius 



1. Lower tooth of mandible present as a distinct, though small projection . . 2 

 Lower tooth of mandible absent 4 



2. First tergite in side view pyramidal above, the tergite about 1.2 as long as high; 



front wing 11 to 14 mm. long 1. robustus Cresson 



First tergite in side view rounded above, the tergite about 1.35 to 1.6 as long 

 as high; front wing 6 to 11 mm. long 3 



3. Third tergite about 0.90 as long as wide; punctures on meso- and metapleura 



moderately coarse; apicolateral angles of tergites a little less dintinct; front 



wing 7 to 11 mm. long 2. mimicus, new species 



Third tergite about 0.75 as long as wide; punctures on meso- and metapleura 

 very coarse; apicolateral angles of tergites a little more distinct; front wing 

 6 to 8 mm. long 3. krombeini, new species 



4. Yellow on second to fourth tergites medially narrow, sublaterally extending 



forward almost to reach front margin of tergite (fig. 184,b) 



5. galbaneus, new species 

 Yellow on second to fourth tergites of rather even width, wide, narrow, or some- 

 times absent from second tergite, but not narrow medially and almost 

 reaching front margin sublaterally (figs. 183, g,h; 184,a,c) 5 



