v"l 



606 FAUNA HAWAIIENSIS 



Fam. TRYPOXYLONIDAE. 



Trypoxylon Latr. 



(i) Trypoxylon bicolor Sm. 



Identified by Dr Ashmead. It is an Oriental species, not known to occur in 1897, 

 but common in 1900 at Hilo, Hawaii. It has now spread to Oahu and probably to the 

 other islands, as it often nests in furniture, chairs, etc. 



Hab. Hawaii, Oahu. 



PisoN Spinola. 



Vide huj. op. i. p. 14. 



( I ) Pi son sp. ? 



A third species of this genus has been introduced recently and is now very abundant 

 in Honolulu. I find that P. iridipcnnis was common here in 1900, but it is now lost 

 amongst the great numbers of the new species. 



Hab. Oahu, Honolulu. 



Fam. CRABRONIDAE. 



In the Trans. Ent. Soc. London, 1902, p. 145 et seq. I divided the Hawaiian 

 Crabronids into five groups or genera, including N'esocrabro, already characterized in 

 this work. 



Xcnocrabro includes all the species other than those previously referred to Nesocrabro, 

 excepting Crabro adnormis now Oreocrabro, Crabro tumidoventris now Hylocrabro, and 

 Crabro curtipes now Melanocrabro. The species assigned to Xenocrabro are clearly very 

 closely allied to the common European species called Crabro or Solenius vagus, and 

 I believe the other Hawaiian forms are all related to or derived from Xenocrabro. 



Nesocrabro Perkins. 



Nesocrabro adspectans, Blackb. 

 Nesocrabro daemonius Perkins, huj. op. i. p. 28. 



Having seen the types of N. adspectans, I see no specific characters to distinguish 

 N. daemonius. 



Nesocrabro rubrocaudaius, Blackb. 

 Nesocrabro bidecoratus Perkins, huj. op. i. p. 27. 



As I anticipated, this is nothing more than a very remarkable variety of the above 

 species. 



