ICHNEUMONID FINAL INSTAR LARVAE — SHORT 501 



Larval Key 



1, Mandible with blade slightly curved Ophion 



Mandible with blade strongly curved so that the tip points dorsally. 



Enicospilus 



The following were examined: Ophion ancyloneura Cameron, 

 0. hilineatus Say, 0. idoneus Viereck (fig. 60a), 0. tityri Packard, 

 Enicospilus amerieanus (Christ), E. arcuatus (Felt) (fig. 60b), E. 

 glabratus (Say), E. horsfeldi Cameron, E. purgatus (Say), E. texanus 

 (Ashmead), and Enicospilus spp. 



In Enicospilus amerieanus the blade of the mandible, although of 

 the Enicospilus form, is not so strongly curved as in figure 60b. A 

 lightly sclerotized plate is present on the ventral edge of the labrum 

 of some species of Enicospilus. This shoidd not be confused with 

 the suspensorium of the hypopharynx which is also visible in several 

 species. 



The following are figured in the literature: Thyreodon atricolor 

 (Olivier) (Cushman, 1947), Enicospilus macrurus (Drury) (Beirne, 

 1941), E. purgatus (Say) (Cushman, 1947), Enicospilus sp. (Moutia 

 and Courtois, 1952), and Ophion idoneus Viereck (Cushman, 1947). 



Subfamily Anomalinae 



Figures 60c-63 



This endoparasitic group usually has been placed as a tribe of the 

 Ophioninae. The larval characters of those species examined differ 

 markedly from the characters of the Ophioninae and the group has 

 therefore been treated as a separate subfamily. The form of the 

 labial sclerite is generally similar in the Anomalinae and Ophioninae 

 and, although this might indicate some sort of general relationship 

 between the two groups, the form of the remaining sclerites and the 

 mandibles differs sharply. 



The epistoma, pleurostoma, and hypostoma are broad and well 

 sclerotized; the hypostomal spur is absent; the stipital sclerite curves 

 dorsally from the labial sclerite to meet the hypostoma; the labial 

 sclerite is relatively slender and is incomplete ventrally except in 

 Anomalon where the ventral part is moderately sclerotized, and 

 in Heteropelma where the ventral part is very lightly sclerotized; the 

 maxillary and labial palps each have two sensilla, one large and one 

 small, except in Anomalon where the two sensilla are approximately 

 equal in size, the dorsal being flat and the ventral peglike; the silk 

 press is sclerotized; a lightly sclerotized prelabial sclerite which lacks 

 a ventral projection is present in some genera; the labral sclerite is 

 absent, but large sensUla which are grouped in various patterns are 

 present on the labral area; setae are reduced and labral and prelabial 

 setae appear to be absent except in Anomalon; the mandibles are 

 large with relatively straight blades which lack teeth except in 



