490 REVISION OF THE AUSTRALIAN SPECIES OF BOLBOCERAS, 



Group ii. 



Pirst Subgroup (species not having, in either sex so far as known, an elongate 

 transverse carina on the pronotum behind the middle). 



Malen. 



A. The clypeus projects in front as a rostrum. Maxil- 

 lary palpi very long and slender proboscideum, Sch reib. 



AA. Clypeus not rostriform. (Maxillary palpi less 

 elongate and stouter.) 

 B. Pronotum with 4 horns or spines placed in a 

 transverse row. 

 C. The clypeal and frontal elevations confused 



together into a single elevation Froggatti, BlacTih. 



CC. The clypeal and frontal elevations distinct 

 from each other. 

 D. The frontal elevation consists of three 



horns placed transversely armigerum, Mad. 



DD, The frontal elevation consists of a 



single horn feebly bifid at the apex tenax, Blackh, 

 BB. Pronotum not bearing a transverse series of 

 4 horns or spines. 

 C. Head not having horns near the base. 

 D. The extremities of the clypeal elevation 

 not erected into horns. 

 E. The retuse area of the pronotum 



devoid of lateral elevations truncatum, Blackh. 



EE. Retuse area of pronotum with lateral 



(or sublateral) elevations ingens, Macl. 



DD. The extremities of the clypeal elevation 



erected into horns f rontale, Guer. 



CC. Head armed with two horns between the 



eyes taurus, IVestiu. 



Females. 



A. The clypeal elevation and clypeal carinas do not 



form angles at their points of contact proboscideum, Sc/im&. 



AA. The clypeal elevation and clypeal carinse form 

 angles at their points of contact. 

 B. Clypeal elevations not having an angular pro- 

 jection in the middle. 

 C. Transverse carina of pronotum having a 



median tooth. truncatum, ^ZacA;&. 



