Swallow.] 462 [March 17, 



positor dark testaceous, longer than the abdomen, perfectly straight, 

 tapering only on apical fourth, finely pointed. 



Length of body, 9, 16.5 mm. ; of antenna?, ?, 50 mm.; of tegmina, 

 ?, 8.75 mm.; of hind femora, ?, 16 mm.; of ovipositor, ?, 13.5 mm.; 

 2 ?. Texas, Belfrage; Mississippi. This is the insect referred to in 

 the Proceedings of the Boston Society of Natural History, XI, 434-5, 

 as laying its eggs in the stems of the cotton plant. Dr. Hagen's spec- 

 imens were from Chicot Co., Arkansas. " The eggs were pale yellow, 

 one-fifth of an inch long, cylindrical, bluntly pointed and a little 

 tapering at the end from which the larva emerges; the other extrem- 

 ity was rounded. " 



20. Xiphidium nemorale. Greenish-brown ; the usual dor- 

 sal markings more or less distinct. Fastigium of vertex broad, but 

 little pinched at the front edge of the eyes, as viewed from above, 

 rapidly narrowing in front to meet the frontal costa. Tegmina cov- 

 ering about two-thirds of the abdomen, the veins and cross veins 

 unusually prominent, giving the tegmina a coarse and scabrous look ; 

 they are broadly rounded at tip, and the tympanum of the males is 

 stout and elevated ; tip of hind femora and all the tarsi dusky. Ovi- 

 positor as long as the abdomen, a little ensiforni, rather delicately 

 tapering in the apical half, finely pointed. 



Length of body, cf, 13 mm.; ?, 14 mm. ; of tegmina, cf, 6 mm. ; 9, 

 6.25 mm. ; of hind femora, J 1 , 11 mm.; 9, 13 mm.; of ovipositor, 9, 

 8.25 mm. 14 cf, 24 9, "taken only in groves " by Mr. J. A. Allen, 

 Sept. 1-3, in Dallas Co., Iowa. 



Notes on the Chemical Composition of some of the Min- 

 eral Species accompanying the Lead Ore of Newbury- 

 port. By Miss Ellen H. Swallow. 



The country rock is apparently a fine grained gneiss. The strike 

 of the vein is about East North East. 



The rock of the south wall is of unknown thickness. The distance 

 between the vein as now opened and the gneiss may be fifty feet or 

 more. This rock is compact amorphous, pale yellowish green in color 

 with the lustre of serpentine. Quartz grains are evenly distributed 

 through it as seen under the microscope, and as confirmed by exam- 

 ining the powder with polarized light. It also contains small crys- 

 tals of pentagonal pyrite. Sp. Gr. 2.766, Hardness 2.5, fusible only 

 on thin edges, very little attacked by acids. 



