Artici^E VII. — Ttc'o New Species of Ltimhri cider from Jlliiiois* 

 By Frank Smitit and I\i,i7Aki;th Mak Gittins. 



But few species of endemic Tjimhricidcc have been described from 

 the United Stales and none from ilHnois. The species here described 

 and others of which descriptions are in preparation are of the small 

 group which has had its chief development in North America and 

 which has been designated by Michaelsen as the subgenus Biniastus of 

 the genus Helodrihis. 



Much of the matter in this paper is from a thesis presented by 

 the junior author in partial fulfilment of the requirements for the 

 degree of Master of Arts in the Graduate School of the University 

 of Illinois. The thesis was prepared under the supervision of the 

 senior author and based on material in his collections. 



He;i.odril,us (Bimastus) zetrki n. sp. 



Definition. — Color of living worm, chestnut-brown tinged with 

 purple, more pronounced anteriorly. Length, extended, 97-140 mm. 

 Maximum diameter, 5-6.5 mm. at the clitellum. Somites, 100-142. 

 Prostomium epilobic, Yi-Yz. Setse closely paired; anterior to the 

 clitellum, aa: ab: be: cd: t/ci = 6: i : 5 : i : 20; posterior to the clitel- 

 lum, be is relatively greater, and dd is somewhat less. First dorsal 

 pore, V/VI. Clitellum XXVII-XXXVII (=11 somites) ; incomplete 

 ventrally. Tubercula pubertatis lacking. Spermiducal pores on XV\ 

 inconspicuous, with the surrounding glandular areas encroaching but 

 slightly on XVI. Septa VI/VII-XII/XIII are thickened and XIII/ 

 XIV^ and XIV/XV are more strongly thickened. Sperm sacs, two 

 pairs, in XI and XII. Spermatheca? lacking. 



The type, which is an Illinois specimen, and the paratypes are 

 in the collection of the senior author. 



The description of this species is based on specimens found in 

 the woodlands of two localities near Urbana, Illinois, and in those of 

 a locality near Douglas Lake in Cheboygan County, Michigan. The 

 Illinois specimens were collected by Mr. James Zetek, for whom the 

 species is named, and the Michigan specimens were collected by Miss 

 Bessie Green, who was at the time a Research Assistant at the L^ni- 



*Oontributions from the Zoological Laboratory, University of Illinois, No. 41. 



