420 PROCEEDINGS OF THE NATIONAL MUSEUM vol. no 



4. Mandible without teeth; setae on body with length equal to one-third to one- 



half that of mandible Cteniscini 



Mandible with teeth," or, if without teeth, then setae on body large with length 

 equal to approximately three-quarters that of mandible 5 



5. Mandible with teeth; maxillary and labial palps each with three sensilla, or, 



if not, then with two sensilla, one round and one crescentic . . Thymaridini 



Mandible without teeth, or, if with teeth, then maxillary and labial palps each 



with two sensilla both of which are round Tryphonini 



Tribe Phytodietini 



Figure 11b,c 



The members of this tribe are parasites of caterpillars. The egg is 

 attached to the host b}^ a stalk and most of the larval development 

 occurs after the host spins its cocoon or makes a pupal cell in the 

 ground. 



The lightly sclerotized plate situated on the labium ventral to the 

 labial sclerite is characteristic of this group. In contrast to the other 

 tribes of the subfamily the dorsal part of the epistoma is very lightly 

 sclerotized. 



Larval Key 



1. Closing apparatus of spiracle narrow and separated from atrium by a length 



of trachea equal to length of closing apparatus Phytodietus 



Closing apparatus of spiracle broad and situated adjacent to atrium . Netelia 



Phytodietus pulcherrimus (Cresson) (fig. 11b), Netelia exserta (Cusli- 

 man), and A^^. geminatus (Say) (fig. lie) have been examined. 



The labral sclerite of A^. exserta differs from that of A^. geminatus 

 in that the dorsal part consists only of a single sclerotic band and the 

 lateral parts do not end in forked enlargements. This is of interest 

 since Townes and Townes (1951) place exserta in the subgenus Pros- 

 thodocis, whereas geminatus is placed in the subgenus Netelia. 



There is a relatively large, round sensillum in the center of the 

 antenna in Netelia. The sensillum is, however, much smaller than 

 the papillus of a papilliform antenna, and the antenna of Netelia is 

 best described as disc-shaped. 



Phytodietus pulcherrimus (Cresson) is figured by Simmonds (1947), 

 and P. gelitorius (Thunberg) and Netelia vinulae (Scopoli) are figured 

 by Beirne (1941). Simmonds does not figure the sclerotized plate on 

 the labium of P. pulcherrimus. This is presumably an oversight. 

 Beirne describes a lower row of small teeth near the tip of the blade 

 of the mandible in Netelia. This row of teeth was not seen in the 

 species of Netelia examined. 



" Teeth are present on the mandible of Erromenus dolichops Townes and Townes (Tryphonini) but they 

 are very small. This species (flg. 13a) may be distinguished from the Cteniscini by the shape of the 

 mandible. 



