8 
CHORDEUMA TO IDEA. 
NOTH ON THE FAMIEIES OF CHORDEUMATOIDEA. 
A further examination of the relationships of the higher groups of 
Diplopoda has resulted in the separation of an order Coelocheta from 
the Merocheta and of an order Zygocheta from the Diplocheta. The 
Coelocheta will contain three suborders, the Lysiopetaloidea (Cal- 
lipodoidea), the Striarioidea (nov.), and the Chordeumatoidea ; the 
true lulidae and their allies comprise the Zygocheta. 
In the Chordeumatoidea several families may be distinguished as 
follows : 
Family CHORDEUMATiDiE C. E. Koch, 1847. 
Genera: Caseya, Chordeuma, Melogona, Mycogona, Under- 
woodia. 
Distribution : Europe and North America. 
Family CRASPEDOSOMATID^ Gray, 1842. 
Genera : Aporogona, Atractosoma, Attemsia, Basigona, Bomogona, 
Chelogona, Craspedosma, Grypogona, Haasea, Haplogona, lulogona, 
nov., type I. tyrolense (Atractosoma Verhoeff), Ochogona, Ornitho- 
gona, 710 V., type O. helvetica (Atractosoma Verhoeff), Phanogona, 
Rhymogona, 7 iov., type Rh. mo 7 itivaga (Atractosoma Verhoeff ). 
Distributioji : Europe. 
Family CEEIDOGONID^ Cook, 1896. 
Genera : Cleidogona, Bactropus, Pseudotremia. 
Distributio 7 i : Eastern North America. 
Family CONOTYEID^, nov. 
Genera: Conotyla, Trichopetalum, Zygonopus, Scoterpes. 
Distribzdion : Eastern North America. 
Family TRACHYGONID^ Cook, 1896. 
Genera : Rhiscosoma, Trachygona. 
Distribution : Europe. 
Family BRANNERIID^, nov. 
Genus : Branneria. 
Distribution : Eastern North America. 
Family HETEROCHORDEUMATID^ Silvestri, 1895. 
Genera : Heterochordeuma, Pocockia. 
Distribution : Malaysia. 
♦American Naturalist, Dec. 1895, p. 1115. 
