AET. 18 NEW GEITERA OF MILLIPEDS COOK AND LOOMIS 19 



earinae, about twice as broad as long, scarcely wider than the head, following 

 segments with lateral earinae rather narrow, nearly horizontal, not tuber- 



culate Ischnocyhe, new genus. 



Body about eight times as long as broad, very compact, the anterior subsegments 

 concealed; first segment with distinct tubercles and lateral earinae, much 

 wider than the head ; following segments with lateral earinae broad, sloping 

 slightly, with rows of dorsal tubercles extending to near the lateral 

 margin Brachycyhe. 



Genus ANDROGNATHUS Cope 



ANDKOGNATHUS CORTICARIUS Cope 



Andrognathus corticarius Cope, Proc. Amer. Philos. Soc, p. 182, 1869. 

 Known from Virginia and Tennessee. 



MITOCYBE, new genus 



Type. — Mitocyhe cmriportcce, a new species from California. 



Diagnosis. — From the form and sculpture of the body, the lamina- 

 tion of the segments and the situation of the repugnational pores, 

 this genus appears to be closely related to European DoUstenus, 

 from which it differs at least in having a distinct preanal scale. 

 The presence of a preanal scale, the location of the pores on the 

 surface of the segments, and the normal formation of segment 5 

 distinguish Miiocyhe from its closest American relative, Andro- 

 gnathivs. 



Description. — Body slender, from fifteen to twenty-five times as 

 long as broad; segments very numerous, in females exceeding 100. 



Head cordate, not produced into a pointed snout nor covered by 

 the first segment, turned under the body; antennae short and stout, 

 widely separated at base; eyes lacking. 



First segment subreniform, emarginate in front, the angles ab- 

 ruptly rounded and the anterior margin raised ; median sulcus absent ; 

 surface not tuberculate but covered with fine, erect hairs. 



Subsequent segments hirsute, not tuberculate ; dorsum evenly con- 

 vex, the lateral earinae thickened instead of being flattened or 

 depressed; the repugnatorial pores on the caudal angles; sulcus 

 present on all segments from the second to the penultimate. 



Last segment hoodlike, rather long and with the apex truncate; 

 no impressed median sulcus. 



Anal valves visible beyond the last segment. 



Preanal scale present, comparatively large and pilose. 



Sterna produced into lobes which separate the coxae. 



Legs short and slender, not reaching the sides of the body ; coxae 

 twice as thick as the other joints; in addition to the coxal joint there 

 appear to be six other joints. 



Males smaller and with fewer segments than the females. 



The generic name alludes to the long, attenuate body contrasting 

 with Brachycyhe and associated genera. 



