Le Conte on the Pselaphide of the United States. 93 
A. Tibiis posticis ealcare obaelete vel nullo. 
. Fronte postice concava, vertice cristato : d antennarum articulo ultimo 
uu solum cognoscendus 
1. ĝ 9 Ione. Capite iaido vertice valde hae pe 3-lineato. 
(Hic ponendi, sunt B. formicarius, Germari, Dregei, et venustus.) 
2. Fronte postice concaya, vertice mm teles lateralibus permagnis ; 
d tibiis anticis contortis spiniferis. 
. d Armiger. odes 3-cristato, antennarum art. ult. longissimo, tarsis posticis 
articulo 1mo dilat 
3. d aero: Pb 3-cristato, antennarum art. ult. longiusculo, tarsis posticis 
simplicib 
A 2 Foe Vertice 3-óistile, antennarum art. ult. ovali, impress. capitis con- 
ntibus 
5. m: vinhaa Vertice 3-cristato, antennarum art. ult, ovali, impress. capitis dis- 
cretis. 
6. Q Confinis. Vertice 1-cristato, antennarum art. ult. ovali, imp. capitis conjunctis. 
` Ad hanc turmam forte referendus B. australis Er. . 
. Tibiis posticis calcare terminali longo, tenui. 
3. Fronte inter antennas, plus minusve elevata, retusa vel marginata, clypeo 
apice sepius i? dentato, vel cornuto 
7. d Frontalis. Capite levi, fronte valde retuso, rufus, elytris impunctatis. 
8. d 9 Punctatus. Capite levi, vertice tuberculato, rufus elytris punetatis, 
9: - - Riparius. Capite leviter scabro, vertice cristato, levi, rufus, elytris. punc- 
10. whe Scabriceps. Capite scabro , castaneus, ly 1 p nds 3 4. : g 1321. 
Jedes on: xat 
J L3 
11, d Nigricans. C apite levi, thorace 3 lineato, niger, 
(Hic —— B. oculatus Europz.) 
12. d 9 Striatus. Capite levi, iria 3 lineato, elytris obsolete punctulatis. 
(Forte hic advenit B. Delaporti Europe.) 
13. a Q Globosus. Capite scabro, nie lovi, thorace 3-lineato, elytris impunc- 
14. do 9 cot Capite levi, thoracis linea media obsoleta, niger elytris im- 
Rs e minime retusa. 
15. ĝ Bistriatus. Capite scabro, vertice levi, eaten media obsoleta. 
16. 32 2 — eaticollis. Capite scabro, thorace 3-lineal 
urma, verisimiliter ponendus B. albionicus Californie. 
mdi I am not quite certain that I have intercalated the foreign species 
in the proper place; as the characters „which I have chosen to define the groups 
bons not to have been Soman before. Even so important a mark as the terminal 
æ has been mentioned by Aubé in only a single instance, 
(b. oculatus,) iion pe his wrie omitted it inB. lineaticollis ud. Schaumii, 
ciis is very obvious, we may ea i 
i 'sexual eharacters of B Delaporti are so very: similar to those of sev- 
eral. species of my third group, that I think it most. tinet Ihave 
placed i x 
_ A few words on the ¢ great number of species which T have ventured to establish: 
In the second group it may appear that I have increased the species without suffi- 
