l(je Cutailiait Intomalaji^i 



Vol. XLIV. 



LONDON, MARCH, 1912. 



No. 



NOTES ON GEOPHILOIDEA FROM IOWA AND SOME 

 NEIGHBOURING STATES. 



BY RALPH V. CHAMBERLIN. 

 Un'vers'ty of Pennsylvania, Piiiladelphia. 



During several weeks in June and July of 1910 I had opportunity for 

 making collections of chilopods in the district indicated by the title of this 

 paper. Unfortunately, the season was unusually dry in these Stales, 

 particularly in Michigan and Wisconsin, and, as a result, unfavourable for 

 securing an abundance of material. The members of the Geophiloidea 

 seemed especially difficult to uncover; but among the species obtained 

 are several of exceptional interest, two representing new genera, for which 

 it seems necessary to erect a new family. The families of the Geophiloidea 

 now recognized as occurring in the United States, east of the Rocky 

 Mts., may be separated as follows : 



a. Mandibles with a dentate lamella. 



b. Mandibles with a single pectinate lamella ; antenn^^ filiform or 



somewhat clavate Family Sche7idylidœ. 



bb. Mandibles with several pectinate lamellœ ; antennas flattened, 



attenuated distad Family Himantariidœ. 



aa. Mandibles with no dentate lamella ; with a single pectinate lamella. 



b. Labrum fused for a short distance at middle; antennte flattened, 

 at least narrowly elliptic in cross-section, attenuated 



distad Family Sogonidœ. 



bb. Labrum entirely free ; antennae cylindrical, filiform or a little 

 clavate. 



c. Median piece of labrum extending along and, at least 

 in part, fused with the lateral ; at middle of free 

 edge with two much larger and more strongjy- 

 chitinized teeth directed more or less 



ventrad Family SoniphiUdœ, fam. nov. 



cc. Three divisions of labrum distinct : without two such 

 larger and ventrally-directed 

 teeth . . . . ■. Family GeopJiilidce. 



