The Craspedosomatidas of North America. 5 



Family PAKADOXOSOMATiDiE, — genera Paradoxosoma, Trachydesmus. 

 Distribution: Corfu. 



Family PHATYKEHACHiDiE, — genera Acanthodesmus, Odontodesmus, 

 Platyrrhacus, Trachelodesmus. 



Distribution : Tropics of both hemispheres. 



Family PoLYDESMiDiE, — genera Brachydesmus, Chsetaspis, Goniodesmns, 

 type G. fissilobus (Polydesmusfiissilobus,Brolemanu), Polydesmus, Scytonotus. 



Distribution: Temperate Europe, Asia and North America. 



Family Strong ylosomatid^, — genera Anoplodesmns, Centrodesmus, Cne- 

 madesmus, Cylindrodesmus, Eudasypeltis, Icosidesmus, lulidesmus, Ophio- 

 desmus, type 0. verhceffi ( Strongylosomum verhoeffi, Brolemann), Orthodesmus, 

 Prionopeltis, Ehadiidomorpha, Strongylosoma, Tetracentrosternus, Trogo- 

 desmus. 



Distribution: Cosmopolitan, mostly Tropical. 



Family Stylodesmid^, — genera Cynedesmus*, Lophodesmus, Pyrgodes- 

 mtis, Stylodesmus. 



Distribution : Tropics of both hemispheres. 



Family Xy'STODESMID^, — genera Eurydesmus, Fontaria, Pachydesmus,type 

 P. crassicutis (Wood), Ehysodesmus, type R. Umax (Sauss. ), Stenodesmus, 

 Xystodesmns, type X. martensii (Peters). 



Distribution: North America and Eastern Asia. 



Order Diplocheta. 

 Suborder Spieostkeptoidea. 

 Family SPiROSTEEPTlDiE, — genera Alloporus, Archispirostreptus, Ctenoiu- 

 lus, Odontopyge, Plusioj)orus, Ehynchoproctus, Spirocyclistus, ■ Spiropoeus, 

 Spirostreptus, Thyropygus. 



Distribution: Tropics of both hemispheres and South Africa. 



Family TEACHYSTEEPTlDiE, — genera Trachystreptus, type T. cam'baloides,-\ 

 Loijhostreptus, type i. magnus (Karsch)..| 



Distribution : Tropical Africa. 



*Type Cynedesmus formicola, U. S. National Museum; the genois also in- 

 cludes C. ornamentatus ( Cryptodesmus ornamentatus, Karsch). 



f Trachystreptus cambaloides sp. n.^Nearly black; antennte strongly clavate, 

 lying in lateral concavities of the first segment; head, first and last segments 

 closely punctate; other segments with numerous irregular cariniform longi- 

 tudinal ridges. Segments 37-39. Length 25 mm. ; width 2.2 mm. Habitat, 

 Liberia. 



1 1 have examined the type of GlypMuhis magnus Karsch, in the Berlin Mu- 

 seum. 



