No.iJOC ICHNEUMON FLIES— ASHMEAD. 79 



Tribe VI. ORTHOCENTRINI. 



1856. Tfi/phomdci prosopi Holmgren (part), Kongl. Sveiisk. Acad. Ilaiidl., I, 



p. 98; II, 1856, pp. 305-352. 

 1868. Orthocentroidx, Family 11, Fokster, Verb. d. naturh. Vw. pr. Rliciiil., 



XXV, pp. 142 and 159. 

 1894. Orthocentrini, Tribe VII, Asiimead, Proc. Ent. Soc. Wa-sb., Ill, p. 277. 

 1897. Orthocentrini, Tribe, Davis, Trans. Am. Ent. Soc, XXIV, p. 219. 



This tribe and the next, or the Exocliini^ at one time confounded 

 together, are closely allied, both being composed of a number of 

 minute or moderate sized insects, easily distinguished from all the 

 other tribes by cephalic peculiarities and their stout, rather short 

 legs, their femora being much swollen. 



The head is subglobose, with the face, below the insertion of the 

 antennte, abnormally swollen, or highly or convexly elevated, giving 

 these insects, when viewed from the side, quite a different aspect to 

 all other Tryphonines, and which, in connection with their short legs 

 and swollen femora, renders them easy of recognition. 



The Orthocentrini are separated from the Exocldnl by the long 

 scape or first joint of the antennse, which is never short, or globose, as 

 in the latter. 



Forster's generic separation is as follows: 



TABLE OE GENERA. 



Ovipositor not projecting bej'ond tbe tip of the abdomen < 3 



Ovipositor projecting beyond the tip of the abdomen 2 



2. Wings uithout an areolet ( 606 ) Synoplus Forster. 



AVings with an areolet. 



First joint of the flagellum shorter than tlie second. 



(607) Mnesidaciis Forster. 

 First joint of the flagellum as long as the second. (608) Picrosiigeus Forster. 



3. Metanotum without a complete areola; mesopleura withoid a ridge or rim on the 



front margin 4 



Metanotum ivith an areola; mesopleura irith a ridge or rim on the front margin. 6 



4. Petiolar area without a median carina, the metanotum not at all areolated 5 



Petiolar area with a median carina ( 609) Brephoclonua Forster. 



5. Cheeks no< separated from the face by a furrow; metanotum without trace of 



carinse (610) Ili/poleptus Forster. 



- Cheeks separated from the face by a furrow; metanotum with or withotd a 

 carina. 



Metanotum without a trace of a carina; abdomen with the third segment 

 usually the longest, and in female compressed from the second segment, 

 as in a ]>lade of a knife (611) Neuroteles Ratzeburg. 



Metanotum with a single carina; abdomen with the third segment not 

 longer than the second, and in female more or less compressed from the 

 second or third segment; in male, flat (612) Deleter Forster. 



6. Wings vitliout an areolet, rarely appearing as if closed by a slender hyaline 



line 8 



Wings 2vith an areolet. 



Face very high; mesothoracic furrows absent / 



