490 PROCEEDINGS OF THE NATIONAL MUSEUM vol.iio 



9. Prelabial sclerite with ventral part broader than lateral parts of labial sclerite. 



Charops papilionis Ashmead 



Prelabial sclerite with ventral part not as broad as lateral parts of labial 



sclerite 10 



10. Lateral parts of epistoma broad and lightly sclerotized . . . Holocremnus 

 Lateral parts of epistoma not of this form 11 



11. Labial sclerite longer than wide ^^ 12 



Labial sclerite as wide or wider than long 17 



12. Ventral part of labial sclerite broad and well sclerotized . Xanthocampoplex 

 Ventral part of labial sclerite not as above 13 



13. Ventral part of labial sclerite forming broad, lightly sclerotized plate and not 



distinct from any lightly sclerotized membrane in ventral part of prelabial 



area 14 



Ventral part of labial sclerite not forming broad, lightly sclerotized plate and 

 distinct from any sclerotized membrane in ventral part of prelabial area 2? 



16 



14. Prelabial sclerite not meeting broad ventral part of labial sclerite . . Idecthis 



Campoplex ^^ 

 Prelabial sclerite meeting broad ventral part of labial sclerite 15 



15. Ventral part of labial sclerite lightly sclerotized and pointed . . . Dusona 



Hyposoter parogyiae (Viereck) 



Ventral part of labial sclerite as well sclerotized as lateral parts and more 



rounded Olesicampe lophyri (Riley) 



16. Ventral part of labial sclerite very lightly sclerotized; lateral part of stipital 



sclerite about 1^2 times as broad as median part Campoletis 



Ventral part of labial sclerite moderately sclerotized; lateral part of stipital 



sclerite about twice as broad as median part Hyposoter 



Horogenes 



Olesicampe pikoneniae Walley, 



Olesicampe euurae (Ashmead) 



17. Labial sclerite complete ventrally Charopsimorpha 



Labial sclerite incomplete ventrally 18 



18. Each lateral part of prelabial sclerite approximately equal in length to ventral 



part Casinaria 



Each lateral part of prelabial sclerite one-half to one-third length of ventral 

 part Nepiera 



The following have been examined: Pyracmon xanthognatha (Roh- 

 wer) (fig. 50a), Campoplex crassifemur (Thomson), C. depressus 

 Viereck, C. frustranae Cushman, C. hyalinus (Provancher), C. phthori- 

 maeae (Cushman), C. polychrosidis Viereck, C. pyraustae Smith, C. 

 rufijemur (Thomson), C. tosensis (Uchida), C. tricoloripes (Schmiede- 

 knecht), C. validus (Cresson) (fig. 50b), Campoplex ^^. nr. inaequalipes 

 Cresson, Xanthocampoplex nigromaculatus (Cameron) (fig. 50c), 

 Xanthocampoplex sp., Idechthis nigriscapus Viereck (fig. 51a), /. 



2» In using this part of the key care should be taken to ensure that all of the prelabial region Is fully visible 

 in a preparation. In some species which have the ventral part of the labial sclerite lightly sclerotized this 

 part may become folded under the rest of the prelabium during mounting, with the result that the labial 

 sclerite appears to be much shorter than it really is. 



" Except Hyposoter parorgyiae (Viereck), where the prelabial sclerite meets the broad ventral part of the 

 labial sclerite. 



M Except Campoplex tosensis (Uchida), which can be recognized by the bubble-like appearance of the 

 prelabial and labial sclerites. 



