OF DERMAPTERA. 105 



Pycnogaster Saga Heteracris 



Barbitistes Conocephalus Platyphyma 



Ephippiger Tryxalis Stauronotus 



Cyrtaspis Pyrgomorpha Paracinema 



Thyreonotus Opomala Oxycoryphus 



Orphania Porthetis Thrinchus 



Rhacocleis Cnculligera Glyphanus 



In South Europe, as compared to the first region, the genera of this 

 order are much more numerous, as if the advance from the tropical regions 

 had been partly arrested here, aud the aspect of the Mediterranean shore 

 in South France, where swarms of Dermapiera spring from the ground 

 with a noise like the crackling of wood or of straw on fire, sufficiently show 

 that the species chiefly dwell in warm districts. 



Polyphaga inhabits North Africa, South Africa, West Asia, China, 

 Hindostan, South America towards ihe Atlantic and Central America ; the 

 European form (Heterogamia) has some characters which distinguish it 

 from the American form (Homeogamia). Panohlora is found in West 

 Africa, in South Africa, in Hindostan, in Australasia, in both sides of South 

 America, in Central America and in North America ; it has probably been 

 imported into Europe, for some of the species, like those of Periplaneta, 

 have the faculty of adapting themselves to artificial circumstances and are 

 generally distributed in the world. Aphlebia inhabits North Africa. 

 Polyzosteria inhabits North Africa, West Africa, South Africa, China, 

 Hindostan, Australia, South America on both sides, Central America and 

 North America ; some species mimic Coleopterous larva in form and in 

 colour. Tridactylus burrows like the mole cricket, and inhabits Hindostan, 

 Australasia, Central America and South America. Brachytrypes is known 

 only in Sicily as a European genus, and occurs in West Africa, South 

 Africa, China, Hindostan, Australasia and Australia, and one species, 

 B. achatinus, is a native of all these regions. Mogoplistes inhabits North 

 America. (Ecanthus inhabits West Africa, South Africa, Hindostan, 

 Australasia, Australia and New Zealand. Trigonidium inhabits Mauritius, 

 Ceylon, Java and the Hawaiian Isles; it mimics some Coleopterous insects. 

 Phalangopsis inhabits West Africa, South Africa, Hindostan, Australasia, 

 South America towards the Atlantic, Central America and North America. 

 Platyblemmus is found in North Africa and in Hindostan. Arachnocephalus 

 is as yet only known in the Neapolitan district. Hadenoecus is North 

 American and perhaps also Australian, and is one of the cave-insects, the 

 dwellers in darkness ; some of these insects have excessively long antenna?, 

 whereby to feel far about them. Callimenus, Barbitistes, Cyrtaspis, 

 Pterolepis, Orphania, Rhacocleis and Cuculligera are, as yet, peculiar to 

 South Europe. Onconotus inhabits West Asia and North Asia. Pycno* 

 gaster inhabits North Africa. Ephippiger inhabits North Africa, West 

 Asia and Australia. Thyreonotus inhabits South Africa and North 

 America. Saga, in which the European Dermaptera attain their largest 

 development, inhabits all the regions about the Mediterranean, also West 

 Africa, South Africa, North Asia, Hindostan, Australia and the Sandwich 

 Isles. Conocephalus is recorded in the preceding list from all the following 

 regions, excepting West Asia, North Asia, Australia and South America 

 towards the Pacific. Tryxalis inhabits North Africa, West Africa, South' 



