174 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.52. 



poster! ad; although the length is somewhat greater, the number of 

 somites is less; the setae are more closely paired in the latter species; 

 and there seems to be a constant difference in the shape of the anterior 

 ends. In H. heddardi, the anterior somites are comparatively Httle 

 smaller than the others, and the prostomium is broad and blunt, which 

 all tend to give the anterior end a comparatively broad and blunt 

 appearance. In H. i?arvus, the anterior somites are decidedly more 

 reduced in diameter, and the end seems considerably more pointed. 

 As far as can be judged from my data, H. parvus is found in higher 

 and drier situations than is H. heddardi. 



HELODRILUS (BIMASTUS) LONGICINCTUS Smith and GIttins. 



Eelodrilus (Bimastiis) longicinctus Smith and Gittins, 1915: 548. 



Length of well extended specimens, 6.5-9 cm. Somites, 98-122. 

 Color of antero-dorsal part, rose-red; other parts distinctly paler. 

 Prostomium, epilobic ^-§. Setae, closely paired; aa: ah: he: cd: dd, 

 = 10: 1: 7i : |: 30. This formula represents the approximate rela- 

 tions both anterior and posterior to the cliteUum, but some variations 

 are found. CliteUum on 23-32 or 24-33, and the ventral edges extend 

 no farther ventrad than h. Tubercula pubertatis are entirely lacking. 

 First dorsal pore on 5/6. Spermiducal pores on 15, slightly dorsad of 

 h and surrounded by a rather prominent glandular area which en- 

 croaches on 16. Oviducal pores on 14, slightly dorsad of h. Septa 

 6/7 and 14/15, somewhat thickened; and 7/8-13/14, more strongly 

 thickened. Longitudinal partitions of the calciferous gland, about 

 60 in number. Last hearts in 11 and much smaller than those of 10. 

 Sperm sacs in 11 and 12. Spermathecae are lacking. 



//. longicinctus occurs abundantly in the soil of lawns, parkings, 

 and near-by woodlands of Urbana, Illinois. This is the only locality 

 from which it is thus far known. 



HELODRILUS WELCHI, new species. 



Length of alcoholic specimen, 13.5 cm. Diameter (maximum), 

 .45 cm., at clitellum. Somites, 116. Color, no pigment except nar- 

 row transverse bands of brown flecks in the zone of the setae on each 

 of the somites 5-15. Prostomium, epilobic. Setae, closely paired; 

 on somite 45, aa: ah: he: cd: dd = 8: 1:Q: ^: 15. Clitellum, §25-35; 

 pale flesh color. Tubercula pubertatis, lacking. First dorsal pore 

 on 5/6. Spermiducal pores on 15, slightly dorsad of h and not con- 

 spicuous. Septa 8/9-11/12, very strongly thickened; 6/7, 7/8, 12/13, 

 and 13/14, less strongly thickened; and 14/15, scarcely thickened. 

 Longitudinal partitions of the calciferous gland, about 40 in number. 

 Last hearts, in 11 and about equal to those of 10. Sperm sacs in 11 

 and 12. Spermathecae, lacking. 



