496 



PROCEEDINGS OF THE NATIONAL MUSEUM 



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Figure 59. — Ophioninae:Ters'ilochini, head sclerites: Tersilochus argentinensis (Blanchard) 

 (antenna not visible on preparation; 2, spiracle; 3, skin.) 



the atrium. The skin has relatively long setae, approximately equal 

 in length to one-third the length of the mandible, but the projections 

 on the skin are small. 



Tersilochus argentinensis (Blanchard) (fig. 59) and T. conotracheli 

 (Riley) were examined. T. conotracheli is figured by Cushman (1916) 

 and Tersilochus sp. by Beirne (1941). 



Tribe Ophionini 



FiGUUB GO A, B 



Members of this tribe are endoparasitic in larger caterpillars, except 

 that Ophion bifoveolatus Brulle is known to parasitize larvae of Phyl- 

 lophaga (Scarabeidae). Species of Ophion and Enicospilus are noc- 

 turnal or crepuscular and are frequently attracted to lights. 



This is a distinctive tribe although it resembles other tribes of the 

 Ophioninae ui many basic features. The head sclerites are broad 

 and moderately sclerotized. The stipital sclerite has a small lateral 

 expansion and a lightly sclerotized cardo is present. The ventral 

 part of the labial sclerite forms a broad plate. The prelabial sclerite 

 is triangular in shape with the ventral part reduced. Numerous 

 setae are present on the labrum, on the maxilla lateral to the hypos- 

 tomal spur and on the prelabial membrane and the labial sclerite. 

 The mandibles are distinctive, being relatively small and with a 

 rounded base and a slightly or strongly curved blade. The antenna 

 is disc-shaped. The closing apparatus of the spiracle is lightly 

 sclerotized and adjoins the atrium. The skin has very small setae 

 and small projections. 



