46 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



Tail much longer tlian the wing, rounded, but with the four middle 

 rectrices of equal length. Fourth, fifth, and sixth quills longest, the 

 third about equal to the seventh; second not longer than the tenth. 

 Depth of the bill through the base decidedly more than half the length 

 of the gonys, or of the maxilla from the nostril to the tip ; gonys less 

 than half the total length of the mandible. Colors plain brown, paler 

 below, without distinct white markings on wings or tail. 



Type, Harporhynchus graysoni Baird. 



In general appearance, the type and only known species of this genus 

 is somewhat intermediate between the species of the genera Metliriop- 

 terus and HarporhyncJmi^, having the straighter bill of the former and the 

 uniform brownish coloration of the latter. A close comparison, how- 

 ever, reveals the fact that the species in question is very much more 

 nearly related to the genus Mimus than to either of those named above^ 

 while at the same time it becomes obvious that it cannot be included in 

 the latter genus, by reason of the very marked distinctive characters 

 pointed out above, in which it dilfers from every species of Mini us with 

 which I have been able to compare it.* The distinctive characters of 

 the two genera may be contrasted as follows : 



Mimus. Depth of bill through base decidedly less than half the length 

 of the maxilla from nostril to tip, and not more than half the length of 

 the gonys; the latter decidedly more than the distance from its base to 

 the malar apex; third, fourth, and fifth quills longest, second longer, 

 equal to or longer than eighth. Tail with more or less of white. 



MiMODES. Depth of bill through base decidedly more than half the 

 length of the maxilla from nostril to tip, and also decidedly more than 

 half the length of the gonys; the latter decidedly less than the distance 

 from its base to the malar apex. Fourth, fifth, and sixth quills longest, 

 the second equal to the tenth. Tail without white. 



0.\ A PlIOJSiPHATIC SANDSTONE FROITI HAWTHORNE, IN FLORIDA. 



Bj^GEORGE \%. HALVES, PH. D., 



Curator in the Natioiud Museum. 



In connection with the work, upon the products of quarries which is 

 being performed under the auspices of the Tenth Census at the National 

 Museum in Washington, analyses have been made of a stone that is 



*Iiichicling the following: M. polyglottus (including its West Indian races), M. 

 triurus, M. f/ilvus, M. satiirninns, M. calandria, M. thenca, M. longicaudatns, M. "nigriloris," 

 M. MUi, and M. vielanotls. I have not seen specimens of M. dorsalis, M. patachonicus, 

 M. Mfasciatiis, or M. parvulua, but these species (except possibly the two latter) api>ear 

 to be congeneric with those named above. It may prove advisable, however, to 

 separate the three species of the Galapagoes (M. melanotis, M. trifasciatus, and M. 

 paniulus) on account of their very lengthened and slender bill, but I am not prepared 

 to say that this should be done. 



