474 PROCEEDINGS OF THE NATIONAL MUSEUM vol. no 



C. calcitrator is figured by Salt (1931) and a large sclerotized plate 

 is shown underlying the labial area. This plate is the suspensorium 

 of the hypopharynx (see Short, 1952), and is figured here, although 

 in a different position (fig. 45a). The suspensorium is an internal 

 skeletal structui'e forming part of the ventral wall of the cibarial part 

 of the stomodaeum, and the position in which it is seen depends on 

 the position into which it is forced during mounting. 



Subfamily Orthopelmatinae 



Figure 45b 



Orthopelma mediator (Thunberg) was examined. The members of 

 this genus are endoparasitic in the cyuipoids Diasirophus on Ruhus 

 and Diplolepis on Rosa. 



The larval characters resemble those of the Ichneumoninae, although 

 the form of the mandible is different, the hypostoma is more lightly 

 sclerotized, and disc-shaped labial palps are absent. 



The epistoma and pleurostoma are moderately sclerotized and very 

 lightly sclerotized areas are present dorsal to the epistoma and dorso- 

 lateral to the plem'ostoma; the hypostoma is very lightly sclerotized; 

 the lateral parts of the labial sclerite are very faintly sclerotized and 

 folds along the median part of the ventral edge of each maxilla may 

 appear as faintly sclerotized bands; the remaining head sclerites are 

 absent; the maxillary palps are represented by flat discs but the 

 labial palps are represented bj" setae; a lightly sclerotized silk press is 

 visible; the mandible is relatively large and well sclerotized and has 

 a curved blade containing a deep groove on the inner wall of which is 

 situated a prominent tooth; the anterior tentorial pits are prominent; 

 the antenna is disc-shaped; the spiracle is relatively very small with 

 an oval atrium and the closing apparatus, which adjoins the atrium, 

 is equal in length to twice the depth of the atrium; the skin is smooth 

 with small setae and no projections. 



Orthopelma mediator as figured by Beu'ne (1941) shows a toothless 

 mandible, disc-shaped labial palps, and a well-sclerotized hypostoma. 

 These structures have not been seen in any specimen of 0. mediator 

 examined in the present study. 



Subfamily Plectiscinae 



Figure 46 



This is a very isolated subfamily and little is known about its 

 biology. The usual hosts are believed to be Fungivoridae. The 

 larval characters suggest that the group is endoparasitic. 



Megastylus sp. (fig. 46a) and Plectiscus varius (Haliday) (GCV) 

 (fig. 46b) were examined. 



