ICHNEUMONID FINAL INSTAR LARVAE — SHORT 503 



but it does not appear to be a close relationship, a conclusion which 

 Walkley (in litt.) has also reached from study of the adults. Anomalon 

 differs from the other Anomalinae examined in that the blade of the 

 mandible bears distinct teeth; there are setae on the prelabium; and 

 the ventral part of the labial sclerite, although not as well sclerotized 

 as the lateral parts, is nevertheless distinctly sclerotized. It is also 

 possible that the hypostomal spur might be represented in Anomalon 

 by a small projection from the antero ventral part of the hypostoma. 

 Anomalon therefore can be considered to have an isolated position 

 within the Anomalinae. The larval habits also distinguish this genus 

 from other Anomalinae in that larvae of Elateridae appear to be the 

 usual hosts, whereas the hosts of the other Anomalinae examined were 

 lepidopterous. 



Anomalon sp. (60c) was examined. A. ejuncidum Say is figured by 

 Cushman (1947). 



Tribe Ophionellini 



Ophionellus foutsi (Cushman) is figured by Cushman (1947). This 

 figure is not suflficiently detailed to allow the Ophionellini to be dis- 

 tinguished from the Gravenhorstiini. 



Tribe Gravenhorstiini 



Figures 61, 62 

 Larval Key 



1. Labral sensilla arranged in two separate groups Atrometus 



Labral sensilla arranged in single line 2 



2. When head sclerites mounted flat on slide then posterior ends of hypostomae 



extend to point approximately level with ventral end of labial sclerite . . 3 



When head sclerites mounted flat on slide then posterior ends of hypostomae 



do not extend to point level with ventral end of labial sclerite 4 



3. Width of pleurostoma at anterior pleurostomal process approximately equal 



to two-thirds length of mandible Aphanistes 



Width of pleurostoma at anterior ]:ileurostomal process much less than two- 

 thirds length of mandible Labrorychus 



4. Hypostoma with sclerotized expansion along entire dorsal edge . . Barylypa 

 Hypostoma without sclerotized expansion along entire dorsal edge .... 5 



5. Length of blade of mandible less than half width of base and arising from 



ventral surface of base Blaptocampus 



Length of blade of mandible approximately equal to half width of base and 

 arising from middle of base Agrypon 



The foUomng have been examined: Aphanistes hyalinus (Norton) 

 (fig. 61a), Barylypa insidiator (Foerster) (fig. 61b), Labrorychus analis 

 (Say) (fig. 61c), L. prismaticus (Norton), Labrorychus sp., Atrometus 

 clavipes (Davis) (fig. 62a), Agrypon sp. (fig. 62b), Blaptocampus 

 nigricornis (Wesmael) (GCV) (fig. 62c). 



504675—59 8 



