480 



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Figure 49. — Metopiinae, head sclerites; Chorinaeus sp. (antenna not visible on preparation; 



2, spiracle; 3, skin.) 



to the depth of the atrium, except in Metopius where the closing ap- 

 paratus is thick-walled and with a length three to four times the 

 depth of the atrium; the skin is smooth with small spines and small 

 projections. 



The head sclerites of the subfamily show a strong resemblance to 

 those of the Anomalinae. They also resemble the Pimplini and the 

 Ichneumoninae in having large toothless mandibles and a well- 

 sclerotized epistoma and pleurostoma. These resemblances are pos- 

 sibly associated with similar habits since all these groups emerge from 

 the pupae of Lepidoptera. 



Larval Ket 



1. Epistoma incomplete dorsally Triclistus 



Epistoma complete dorsally 2 



2. A lightly sclerotized plate is present lateral to each pleurostoma and hypos- 



toma 3 



A lightly sclerotized plate is not present lateral to each pleurostoma and 

 hypostoma Chorinaeus 



3. A lightly sclerotized bar is present connecting the posterior pleurostomal pro- 



cesses across the dorsal surface of the food meatus Exochus 



A lightly sclerotized bar connecting the posterior pleurostomal processes not 

 present Metopius 



The following were examined: Metopius micratorius (Fabricius) 

 (fig. 48a), Triclistus curvator (Fabricius) (fig. 48b), Exochus alhijrons 



