cxc 



FAUNA HAWAIIENSIS 



Review of Hemiptera. 



The Hawaiian Hemiptera present an interesting feature in the great difference 

 between the constitution and development of the Heteropterous and Homopterous 



fauna. 



Excluding the scale-insects (Coccidoidea) and the plant-lice (Aphidoidea), of which 

 it is doubtful whether there is a single native representative, the total number of 

 Hemipterous genera is 68, the species numbering 259'. Of these, 47 genera are 

 Heteropterous, 21 Homopterous, while 126 species belong to the former, 133 to the 

 latter division. 



In the Heteroptera the following genera are represented only by species introduced 

 through human agency : Triatoma, Zelus, Alloeocramim, Clinocoris ( = Ciniex and 

 AcantJiia Auct.), Orthoca (with two species, O. nigriceps and 0. vmcta), Clerada, 

 Rkopalus, and Geotomus. Triph/eps of the Anthocoridae and Halticus of the Capsidae 

 are also certainly introductions, and one or two other Anthocorids and Capsids are also 

 open to suspicion. The Pyrrhocorid, Dysdernis peruviamis, should be altogether 

 expunged from the list, as, no doubt, having been brought forward on a wrongly labelled 

 specimen. There was nothing like it in the Blackburnian collection, and I can only 

 suggest Ithaniar hawaiiensis, as the species, therein contained, which may have been 

 supposed to be Dysdercus. Apart from these introduced species, the water-frequenting 

 bugs Arctocorisa blackburni, Buenoa pallipes, Merragata hebroides, Microvelia vagans, 

 and the pelagic Halobates sericeus, may be looked on as natural immigrants — the 

 Biienoa, possibly an introduction by man — the three last-named being already known 

 from other countries. 



Excluding all the 15 genera and 16 species named, there remain to represent the 

 Heteroptera 32 genera and iio species. Twenty-one of these genera and all the 

 species but one (the widely-ranging Reduviolus capsiformis) are at present supposed to 

 be peculiar to the islands. 



The indigenous fauna is made up of representatives of the following nine families 

 only: Anthocoridae, Miridae (Capsidae), Acanthiidae, Myodochidae (Geocoridae), 

 Lygaeidae, Nabidae, Reduviidae, Thyreocoridae and Cimicidae (Pentatomidae). 

 It must be remembered that of these the Cimicidae, Thyreocoridae and Lygaeidae are 

 each represented by only one genus that can claim to belong naturally to the fauna, and 

 that the total number of species is but four, so that these important families are almost 

 unrepresented. The Reduviidae have only a few species (in three genera) belonging 

 to the Ploiariinae. The Nabidae have a single genus with numerous species. On the 

 other hand the Capsidae (and in a less degree the Anthocoridae) are comparatively 

 rich in genera, the former having no less than 14, but in these the total number of 

 described species is only 24. 



^ September, 1909. 



