1927] 
The North American Species of Ryhaxis 
223 
arated by M the discal segmental width or possibly slightly more 
(at their apex) ; the anterior trochanters of the male are acutely 
toothed at apex; and the apices of the metasternal processes are 
rather widely truncate. This is one of our larger species and is 
only equaled or perhaps slightly exceeded in size by valida and 
transversa n. sp. 
Le Conte’s original specimens were described from “provin- 
ciis orient alibus.” The only specimen at present in his series 
which could possibly have served as his type in 1850 is a male of 
the present species and bears a colored locality disk which sig- 
nifies Massachusetts or possibly New England. There are in my 
collection four examples from Three Mile Island in Lake Win- 
nipesaukee, New Hampshire, and I have seen other specimens 
from Mass.; N. 111.; Canada (Toronto and Ottawa); Idaho 
(Coeur d’Alene); and one in Mr. Liebeck’s collection labeled 
“Cal.” 
Rybaxis clavata Brendel. 
Antennal club in the male much enlarged, subcylindrical, 
flattened beneath, blackish except toward the tip, 9th and 10th 
joints nearly or quite twice as wide as long, the flattened lower 
surface strongly asperate almost throughout. Dorsal abdominal 
carinse separated at tip by H the discal width of the segment. 
Anterior trochanters armed with a slender spine. Metasternal 
prominences finely acute and more nearly median in position 
than in any other species. Ventral plate about 1-2 wider than 
long, truncate in front, narrowed posteriorly. 
In his original description of clavata Brendel gives no specific 
locality, but merely states his belief that it is a northern form of 
conjuncta. Later, in his 1890 monograph, he gives as localities 
“Pa. and 111.” in the table of species, and “Region of the Great 
Lakes” following his description. 
Rybaxis transversa sp. nov. 
This species is distinguishable from all others by the very 
strongly transverse ventral plate, which is nearly or quite three 
times as wide as long, the vertical lamina supporting it of nearly 
