180 GEO. n. noRX, m. d. 



Synoni/mi/ and Bibliography. \ 



A. soinipnnotaf IIS Lee. Proc. Acad. 1859, p. 83. 



.1. si mil in Loc. Ann. Lye. V., p. 183. 



A. pinicticoUis Cliaud. Rev. Mag. Zool. 1868, p. 11. 

 A. con<«obriiiiis Lee. Ann. Lye. V., p. 183. 



A. brevicoUis Lee. loe. cit. 



A. calirorui«>iis 9 Dej. Spee. IV., p. 148; Lee. Ann. Lye. V., p. 183. 

 A. confusus % Lee. loc. cit. 



I have adopted the name semipunctatus for the first species, although 

 the name similis has priority, for the reason that the latter applies not 

 to the mass of specimens obtained but rather to a very rare variety, 

 distinguished only by its slightly narrower form. 



The males of the three species have the terminal dorsal segment 

 coarsely punctured, while in the females the punctures are nearly 

 obliterated and the surface comparatively smooth. 



PATROBUS Dej. 

 The species of this genus appear to have been unnecessarily 

 multiplied. Having lately had occasion to examine them closely the 

 following table has been prepared. Typical specimens of all the 

 species are before me with two exceptions fidvus and awjusticollis 

 Mann, which still remain unknown. 



Disc of thorax convex, hind angles with a rather deep fossa; head behind the 

 eyes constricted. 



Last two joints of maxiHnry palpi equal lonieicornis Say. 



Last two joints unequal, terminal longer scptcntrioniM Dej. 



Disc of thorax flat, sub-quadrate, hind angles depressed without fossa; head 

 not or very feebly constricted behind the eyes; terminal joints of maxillarj' 

 palpi equal. 

 Hind trochanter % one-third the length of the thigh and not differing from 



that of the female rilgicollis Rand. 



Hind trochanter % nearly half the length of the thigh and acute at tip, 



that of the 9 normal aterriinus Esch. 



Hind trochanter % nearly as long as the thigh, at tip slender and very 

 acute, that of the 9 scarcely differing from the 9 9 of the two preced- 

 ing californiciis Motseh. 



P. Ion°;icoriiis Say, americanus Dej. 

 Pennsylvania to Missouri and northward. 



P. seplenlriouis Dej., hyperboreus Dej., fossi/rons Esc]i.,fovcicoUis Esch., 

 longivcntris Mann., tenuis Lee., rufipes Lee. 



Europe and Arctic America. 

 P. riigioollis Rand., {angicoUis misprint). 



Pennsylvania, North Eastern States and northward. 

 P. atcrriiiiiis Esch.,/«/o-a<!t3 Lee. 



Colorado and North West to xVlaska. 



