2i6 TRANS. ST. LOUIS ACAD. SCIENCE. 



Many of the characters enumerated belong to all the species of 

 the genus ; and in studying large numbers it is difficult to give 

 any specific diagnosis which shall at once distinguish it from all 

 other described species. To do so will require continued study 

 of all the stages from the moment of hatching, as well as of its 

 Hypopus form— a study which I have not yet been able to give. 



Found in considerable numbers on the roots of grape-vines, 

 and feeding on Phylloxera vastatrix. 



{Fig. 9- 



/^ 



■^r *&f 



Hoplophora arctata — a, ventral view closed; b, side view closed; c, do. slightly 

 open; d, do. more open; e, dorsal view, with legs fully extended. 



Hoplophora arctata, n. sp. — Length 0.028 inch ; diameter 

 scarcely half the length. The horny shield of a highly polished, 

 smooth, mahogany-brown. Legs and trophi carneous-brown. 

 Dorsum arched. Differs from most described Hoplophoras in 

 the very smooth and unarmed covering, and from all in the great 

 narrowness of body. 



Found associated with the preceding, and probably feeding on 

 the decaying roots. It is, I believe, the first American species 

 described. 



On the Well at the Insane Asylum, St. Louis County. 

 By G. C. Broadhead. 



{Plate I.) 



This boring was made by direction of the St. Louis County 

 Court, and prosecuted under "order of the court," and paid for 

 out of the county treasury. The object was to obtain a good sup- 

 ply of fresh water for the use of the Asylum. 



The work was superintended by Mr. C. W. Atkinson, who col- 

 lected specimens from every few feet, and carefully arranged 



