Horn.J ^^'^ [Nov. 5, 



In the summer of 1861 he was appointed by the G-eneral Government to 

 establish army hospitals in this city, and the first eiglit organized and con- 

 structed here were put in working order under his supervision. At the 

 height of the conflict, when the Southern forces invaded this State, he was 

 appointed Medical Director of tlie militia and emergency troops of the 

 State. In fulfilling the duties of this office, he was at Gettj^sburg after the 

 battle, taking care of the wounded, and established a hospital at Carlisle, 

 and also those at Hagerstown, Md. 



Dr. Neill was a writer as well as a practitioner. His contributions to 

 literature were principally, if not exclusively, confined to subjects relating 

 to medical and surgical science, and were usually in the form of articles in 

 medical periodicals. He is known as the author of several anatomical 

 works treating of the arteries, veins and nerves, and also of the surgical 

 and anatomical portions of a very popular work for students, entitled "A 

 Compendium of Medical Science," published about twenty-five years ago. 



A Review of the Species of Anisodactylus inliahiting the United States. 

 By George H. Horn, 31. D. 



(^Bead before the American Philosophical Society, Nov. 5, 1880.) 



It is difficult to understand why this genus has passed almost entirely 

 neglected, and why so much confusion and consequent synonymy prevail, 

 when a short study will demonstrate how easily the species may be 

 grouped and each separated from the other by sharply defined structural 

 characters. 



The division of the genus into three subgenera by the form of the ante- 

 rior tibial spur is long known, but the characters which follow seem for the 

 most part to have entirely escaped notice. The first of these, taken from 

 the structure of the posterior tarsus, and the length of the first joint as 

 compared with the next two, needs no further explanation. 



The presence of two or one setigerous puncture on each side of the clyp- 

 eus near the anterior margin is a character of very great importance and 

 may be used elsewhere in the Carabidns in the separation of smaller groups 

 of species in the manner indicated in the accompanying table. 



The structure of the underside of the male tarsi is also very useful here, 

 it aflFords a means of supplementing any character which may be drawu 

 from the two sexes together, separating very sharply species which appear 

 superficially closely allied. 



In the dilatatus and sericeus groups I have been unable to distinguish any 

 true dorsal puncture. In all the other species the dorsal puncture is dis- 

 tinct and will be found at the posterior third of the elytra on or very close 

 to the second stria. 



All the species have the spurs of the posterior tibiae slender and rather 



