No.i20f,. ICHNEUMON FLIES— AHHMEAD. (}3 



Siii>fcmaiiy x'v. 'j;FiYr»noisriisr..2E;. 



1887. Tryphoiiinn', Subfamily, Cresson, Syn. Hjmii. North America, p. 47. 

 1889. Tnjphonid.r, Family, Thomson, Opus. P^nt., XIII, pj). 1429 anil 1438. 

 1895. Tryplionimv, Subfamily III, Asiimead, Proc. Ent. Soc. Wash., Ill, p. 277. 

 1897. Tryphonin.r, Subfamily, Davis, Trans. Am. Ent. Soc, XXIV, p. 19,3. 

 1900. Tryphonhiiv, Subfamily IV, Ashmeao, Smith's Insects of New Jersey, p. 

 575. 



The, straight, 'never clT)Owed, first abdominal seg-ment, which is usually 

 ses.sile, and the position of its spiracles, as well as the venation of the 

 front wings, readily distinguish this subfamily from all except the 

 riinpli)i(e and the Oiyhioninm. From the former it is easily separated, 

 in the females, by the hidden, or, at most, sul)exserted, non-prominent 

 ovipositor; from the latter by the much shorter, broader, non-com- 

 pressed abdomen, and a totally different haliitus. 



Some males, however, are placed with the greatest difficulty, and 

 may l)e easily confused with those to be foiuid in both the above- 

 mentioned subfamilies. 



I know of no good character to easily distinguish them, although 

 the practiced eye, in most cases, is a])le to place them by comparing 

 them for venational and metathoracic characters peculiar to the 

 females, in the dift'erent groups. 



The TrypKonhicB may be divided into ten minor groups or tribes, as 

 follows: 



TABLE OF TRIBES. 



Posterior tibise with one or two apical spurs 2 



Posterior tibise without apical spurs. 



Second and third abdominal segments without lunulfe Tribe II. Cteniscini. 



2. Posterior tibicB with only one apical spur 4 



Posterior tibiaj with two apical spurs. 



Abdomen sessile or subsessile, never distinctly petiolate 3 



Abdomen distinctly petiolate. 



Claws simple, not pectinate Tril)e I. Mesoleptini. 



Claws pectinate .Tribe III. Ctenopelmini. 



3. Claws pectinate Tribe III. Ctenopelmini. 



Claws simple, not pectinate. 



Mandibles bidentate Tribe I V. Tkyphonini. 



Mandibles tridentate Tribe V. Bassini. 



4. ^liddle tibiaj with only one apical spur 6 



^Middle tibite with ivo apical spurs. 



Face normal, not swollen 5 



Face abnormal, greatly swollen; hind femora usually short and mucli 

 swollen. 



Scape lengthened, "iiot short, globose Tribe VI. Orthocentrini. 



Scape short, globose Tribe VII. Exochini. 



5. AV)domen sessile; dorsum of first and second segments with two parallel carinse. 



Tribe VIII. Tylecomnini. 



Aljdomen petiolate, the 2>etiole long; dorsum of second segment uithoiit carin;e; 



scutellum margined; areolet in front wings not large, subsessile, 



rhomboidal Tribe IX. Spiiinctini. 



