196 ENTOMOLOGICAL NEWS [xxxii, '21 



two teeth on the right mandible and the second tooth on the left man- 

 dible is small : third tooth large, and as the second Dynastine subdivi- 

 sion is characterized as having mandibles without teeth, the original 

 term "tridentate" is here changed to the more correct term "dentate"]. 

 Stridulatory teeth of maxilla short, compressed, truncate. Tibia half 

 as long as femur. Claws of third pair of legs shorter than the other 

 claws. 



The two genera of the first Dynastine subdivision are de- 

 fined by Schiodte as follows : 



Xylotrypes. 



Frons one-third broader than long, with posterior frontal angle acu- 

 minate. Labrum transverse quadrate. Mandible shorter than head. 

 Pars scissoria with three teeth ; posterior tooth of right mandible 

 minute, of left mandible strong. Stridulatory teeth of maxilla six, very 

 coarse. Maxillary palp not reaching apex of exterior mala. 



Oryctes. 



Frons twice as broad as long, with posterior frontal angle sub- 

 rectangular. Labrum transversally orbiculate. Mandible as long as 

 head. Pars scissoria with three teeth ; posterior tooth of both mandi- 

 bles minute. Stridulatory teeth of maxilla ten. Maxillary palp extend- 

 ing beyond apex of mala. 



Xyloryctes. 



(The following definition of Xyloryctes is given in exact 

 conformity with Schiodte's formula.) 



Frons twice as broad as long, with posterior frontal angle 

 subrectangular. Labrum transversally orbiculate. Mandible 

 shorter than head. Pars scissoria of right mandible with two 

 teeth, of left mandible with three teeth ; posterior tooth strong. 

 Stridulatory teeth of maxilla ten. Maxillary palp not reach- 

 ing apex of exterior mala. 



Xyloryctes differs both from Xylotrvpcs and Oryctcs by the 

 shape of the mandibles. It seems more closely allied to Oryc- 

 tes than to Xylotrypes, even though it has the two characters : 

 "Mandible shorter than head and maxillary palp not reaching 

 apex of exterior mala" common with Xylotrypcs. 



Xyloryctes satyrus Fab. 



Length of mature larva about 50 mm. Extreme width of head about 

 7.5 mm. 



Frons coarsely punctate, twice as broad as long, with posterior Frontal 

 angle subrectangular. 



Epicranial and frontal sutures faint. Fpicranial suture about one- 

 third the length of the frons. Procephalic lobes coarsely punctate. 



