ICHNEUMON-FLIES OF AMERICA: 1. METOPIINAE 97 



5. Subgenus Tylopius, new subgenus 



Figure 169,a 



Facial shield escutcheon-shaped but rounded below and seldom with 

 a discernible basal point; upper edge of facial shield weakly arcuate; 

 interantennal process broadly triangular, without a median carina, its 

 sides not elevated, continuous dorsally with a high lamella on frons 

 which ends abruptly near middle of frons ; margin of clypeus broad and 

 almost straight, not reflexed, close to the base of labrum; mandible 

 with two teeth, the lower tooth shorter and a little impressed; maxilla 

 and labium short; temple moderately rounded or rather flat; occipital 

 carina moderately close to foramen magnum, complete; prepectal 

 carina angled strongly forward just above sternaulus almost to reach 

 front edge of mesopleurum, then paralleling front edge of mesopleurum 

 to near subtegular ridge, sometimes partially obsolete above sternaulus; 

 second recurrent vein with one bulla or rarely with two; hind femur 

 about three times as long as deep; tarsal claws apparently simple; 

 first tergite in profile pyramidal, its dorsal face straight and meeting 

 the straight dorsobasal face at an angle; male clasper depressed, with 

 a lateral ridge. 



Subgenotype: Metopius pinatorius Brulle, = M. micratorius of 

 authors, not of Fabricius. 



The subgeneric name is from the Greek "tylus," a callosity, plus 

 the terminal part of the name "Metopius," referring to the shape 

 of the interantennal process. 



This is a Holarctic group. Clement (1930, Konowia, vol. 8, pp. 

 365-408) treats 16 Palaearctic species. To these should be added 

 Metopius (Ceratopius) coreanus Uchida 1930, from Korea, and Metopius 

 (Ceratopius) sapporensis Uchida 1930, from Japan (new s}monyms of 

 sapporensis: Metopius (Ceratopius) arakawai Uchida, 1930 and 

 Metopius (Ceratopius) takabayashii Uchida, 1930). There are four 

 Nearctic species, which are treated below. 



Key to the Nearctic species of subgenus Tylopius 



1. Abdomen elongate (fig. 186,e), the fourth tergite about as long as wide; second 



tergite rather sparsely punctate, the interspaces averaging about 0.7 the 

 diameter of the punctures; apical pale band on first tergite interrupted 



medially; front wing 14 to 15 mm. long 4. basalis Cresson 



Abdomen not elongate (figs. 186,a-d), the fourth tergite about 0.75 as long as 

 wide; second tergite densely punctate, the interspaces reduced to lines; 

 apical pale band on first tergite not interrupted medially; front wing 7 to 

 13 mm. long 2 



2. Hind femur black with white or yellow markings of approximately equal size 



at base and apex; facial shield about 0.97 as high as wide; space between 

 facial shield and clypeal margin about 0.08 as great as height of shield. 



3. edwardsii Cresson 



