2 PROCEEDINGS OF THE NATIONAL. MUSEUM vol. 71 



are M. hrt,vipes (G. O. Sars, 1862, syn. OjMocam'ptus sarsi Mrazek) 

 and M. schmeili Doiiwe, 1903. The European range of the former 

 extends into southern Norway, the latter was found in the upper 

 Bavarian moorlands. The species now to be described from the 

 Laurentian hills is closely related to M. schmeili, differing from it chiefly 

 in small but definite characters affecting the first pair of legs, the 

 abdominal spinules, and the caudal stylets or f ureal rami. 



There are three stages, having approximately the same length of 

 body, which require to be distinguished, namely, the junior stage 

 before external sexual differentiation has set in, the submature stage 

 after this event but before maturity, and the adult stage. The jun- 

 ior stage, which will be described, differs markedly from the adult 

 and recapitulates some features which the latter has lost. The sub- 

 mature stage is characterized by a deep constriction of the last joint 

 of the anterior antennae making them appear to be eight-jointed, 

 and by the shortness of the setae on the fifth pair of legs. These 

 setae are very long in the adult, offering a striking contrast to their 

 condition in M. breiripes. 



There is some confusion regarding the naming of the species in 

 this genus. C. van Douwe (1909) records three species found in 

 Germany: M. sarsi Mrazek, M. muscicola Richters, and M. schmeili 

 Douwe. G. O. Sars (1907) describes one species in the fauna of 

 Norway: M. hrevipes, synonymous with M. anderson-smithi Scott 

 1893, and with Ophiocamptus sarsi Mrazek 1893. In 1895, T. Scott 

 described, under the name Ophiocamptus hrevipes, another species, 

 closely similar to one which had previously been recorded from 

 Bohemia under the same name by Mrazek (1893). Sars (1907, p. 

 207) remarks that the species named 0. hrevipes by Mrazek, is spe- 

 cifically distinct, and he refers to it as Moravia mrazeJci Scott, but I 

 have not found this name employed elsewhere. It seems incumbent 

 upon one to accept the latter name for the species described as 0. 

 hrevipes by Mrazek, whereas that named 0. hrevipes by Scott must 

 receive a new name, Moraria scotti, since it appears to differ from 

 M. mrazelci to the same extent as that species differs from M. schmeili. 

 There is still another Bohemian species, Moraria poppei (Mrazek), 

 with crenulated posterior margins of the segments, which has also 

 been found in Scotland by T. Scott (1897), but this is quite distinct 

 and need not be discussed here. 



Female. — The body is slender, of fairly even diameter, 0.44 mm. 

 long, the segments separated by distinct intersegmental constrictions 

 and their hinder edges smooth. In side view the genital segment is 

 conspicuously subdivided by a refringent chitinous band which does 

 not reach the dorsal surface. The ovisac is one-quarter the total 

 length of the body and may contain five or six eggs only (figs. 1 and 

 2) . The spermatophore (not shown in the figures) is narrowly ellip- 



