74 CATALOGUE Off 



}+ Tip of the head lengthened on each side at the 



base of the rostrum into a short porrect 



obtuse spine. First joint of the rostrum 



extending to the hind border of the eyes, 



about equal in length to the third and 



fourth joints together. Fore femora some- 

 what inciassated, with little spines beneath 



in two series. - Gnathobleda. 



b. Head unarmed beneath or with simple spines, 



rarely with a basal lateral slightly forked 



spine. 

 * Ocelli not or but slightly elevated. Post-ocular 



part of the head not narrowed hindward, or 



but slightly and gradually so. 

 f Fore tibia? at the lips with a long spongy 



furrow. 

 X Body very narrow, much elongated. Head 



small, oblong, with a porrect obtuse little 



spine on each side at the base of the rostrum. 



Ante-ocular and post-ocular parts of the bead 



almost equal in length, the latter a little 



broader than the former, hardly narrowed 



hindward, suddenly straightened at the 



extreme base on each side beneath with 



many rather stout spines, which are seti- 



gerous at the tips. Antennae short, inserted 



near the tip of the head ; first joint much 



shorter than the head, extending far beyond 



its tip. First joint of the rostrum extend- 

 ing to the middle of the eyes, about 



equal in length to the third and fourth joints 



together. Eyes rounded, entire. Prothorax 



very long, subtruncate at the base, more 



than twice longer than the head, slightly 



narrowed forward from the base beyond ihe 



middle, slightly widened from thence to the 



tip, not straightened ; side angles rounded, 



not prominent. Fore wings somewhat 



shorter than the abdomen; tip of the mem- 

 brane lengthened iuto an acute angle. 



Abdomen of the male at least, with almost 



parallel sides; apical segment acutely 

 bilobed at the tip in the male; lobes apart, 

 lengthened hindward. Legs short; fore 



coxaj a little longer than thick ; fore femora 

 thickened, with many little spines beneath; 

 fore tibiae slightly shorter than the fore 

 femora; hind femora extending a little 

 beyond the hind border of the fourth abdo- 

 minal segment. . - - Ctenotrachelcs. 



