158 - Annals Entomological Society of America [Vol. V, 
Pseudopleura ending in a stout process which terminates in two 
points or spines and bears proximad on its ectal surface a row of three 
stout teeth or spines. 
Prefemur of anal legs ventrally with seventeen spines arranged in 
three longitudinal rows, of which the innermost is proximally irregular; 
these from ectal row mesad arranged thus, 4, 6, 7. Mesal surface with 
ten spines. Distal process with five spines. Femur unspined. Claw 
of tarsus with two basal spines. 
Length 40-45 mm. 
Locality: Fort Mohave, Arizona (March 7 and 18, 1911). 
Three specimens received from Prof. Junius Henderson of 
the University of Colorado Museum. 
Family SONIPHILID. 
Genus Soniphilus Chamberlin. 
Soniphilus geronimo sp. nov. 
Yellowish brown anteriorly, becoming clearer yellow caudad. 
Head darker caudad of frontal suture. Antenne light brown, paler 
distad. Legs yellow, those of anterior segments darker. Prosternum 
and prehensorial feet light reddish. 
Antenne of moderate length; articles moderate, not much differing 
in length, the ultimate about equal in length to the two preceding 
taken together. 
Cephalic plate longer than wide in about ratio 7:6; narrowed 
cephalad; lateral and anterior margins convex, the latter a little emar- 
ginate mesally; middle portion of caudal margin sub-straight, rounded 
laterally. A short impressed median line back frontal region; on each 
side a little mesad from and parallel with margin a longitudinal furrow; 
on lateral portion of plate on each side a pair of sulci diverging cephalad 
and a second less distinct pair more mesal in position. Frontal 
plate not discrete. (See Pl. XII, fig. 4.) 
Labrum with median piece comparatively large, bearing about 
six stout teeth. 
Prebasal plate not exposed. Basal plate short, its greatest width 
more than 4.5 times the median length, a greater length exposed on each 
side. (See Pl. XII, fig. 4). 
Claws of prehensorial feet when closed not reaching anterior margin 
of head by a considerable distance. None of the joints bearing teeth or 
nodules. (See Pl. XII, fig. 2). 
Dorsal scuta with lateral sulci distinct; a second pair of sulci close 
to median line and on most also an intermediate sulcus on each side. 
Anterior prescuta very short, increasing in length to about begin- 
ning of caudal third, then again more rapidly decreasing and becoming 
again short. 
_ Anterior spiracle moderately large, circular or subcircular, being 
slightly vertically elongate; succeeding spiracles all circular, very 
gradually decreasing in size to the caudal ones which are very small. 
First pair of legs much shorter and more slender than the second. 
